v8: Relax requirement from VFP3 to VFP2 where possible.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10818026

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@12194 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

14 files changed, 192 insertions, 165 deletions

diff --git a/deps/v8/build/common.gypi b/deps/v8/build/common.gypi
index 1609197876..b677a55685 100644
--- a/deps/v8/build/common.gypi
+++ b/deps/v8/build/common.gypi
@@ -48,7 +48,8 @@
     # both for the snapshot and for the ARM target. Leaving the default value
     # of 'false' will avoid VFP instructions in the snapshot and use CPU feature
     # probing when running on the target.
-    'v8_can_use_vfp_instructions%': 'false',
+    'v8_can_use_vfp2_instructions%': 'false',
+    'v8_can_use_vfp3_instructions%': 'false',
 
     # Similar to vfp but on MIPS.
     'v8_can_use_fpu_instructions%': 'true',
@@ -125,9 +126,14 @@
               'CAN_USE_UNALIGNED_ACCESSES=0',
             ],
           }],
-          [ 'v8_can_use_vfp_instructions=="true"', {
+          [ 'v8_can_use_vfp2_instructions=="true"', {
             'defines': [
-              'CAN_USE_VFP_INSTRUCTIONS',
+              'CAN_USE_VFP2_INSTRUCTIONS',
+            ],
+          }],
+          [ 'v8_can_use_vfp3_instructions=="true"', {
+            'defines': [
+              'CAN_USE_VFP3_INSTRUCTIONS',
             ],
           }],
           [ 'v8_use_arm_eabi_hardfloat=="true"', {
diff --git a/deps/v8/src/arm/assembler-arm.cc b/deps/v8/src/arm/assembler-arm.cc
index ec28da4002..1787d158a8 100644
--- a/deps/v8/src/arm/assembler-arm.cc
+++ b/deps/v8/src/arm/assembler-arm.cc
@@ -32,7 +32,7 @@
 
 // The original source code covered by the above license above has been
 // modified significantly by Google Inc.
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 
 #include "v8.h"
 
@@ -52,17 +52,20 @@ unsigned CpuFeatures::found_by_runtime_probing_ = 0;
 
 
 // Get the CPU features enabled by the build. For cross compilation the
-// preprocessor symbols CAN_USE_ARMV7_INSTRUCTIONS and CAN_USE_VFP_INSTRUCTIONS
+// preprocessor symbols CAN_USE_ARMV7_INSTRUCTIONS and CAN_USE_VFP3_INSTRUCTIONS
 // can be defined to enable ARMv7 and VFPv3 instructions when building the
 // snapshot.
-static uint64_t CpuFeaturesImpliedByCompiler() {
-  uint64_t answer = 0;
+static unsigned CpuFeaturesImpliedByCompiler() {
+  unsigned answer = 0;
 #ifdef CAN_USE_ARMV7_INSTRUCTIONS
   answer |= 1u << ARMv7;
-#endif  // def CAN_USE_ARMV7_INSTRUCTIONS
-#ifdef CAN_USE_VFP_INSTRUCTIONS
-  answer |= 1u << VFP3 | 1u << ARMv7;
-#endif  // def CAN_USE_VFP_INSTRUCTIONS
+#endif  // CAN_USE_ARMV7_INSTRUCTIONS
+#ifdef CAN_USE_VFP3_INSTRUCTIONS
+  answer |= 1u << VFP3 | 1u << VFP2 | 1u << ARMv7;
+#endif  // CAN_USE_VFP3_INSTRUCTIONS
+#ifdef CAN_USE_VFP2_INSTRUCTIONS
+  answer |= 1u << VFP2;
+#endif  // CAN_USE_VFP2_INSTRUCTIONS
 
 #ifdef __arm__
   // If the compiler is allowed to use VFP then we can use VFP too in our code
@@ -70,10 +73,10 @@ static uint64_t CpuFeaturesImpliedByCompiler() {
   // point support implies VFPv3, see ARM DDI 0406B, page A1-6.
 #if defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(__VFP_FP__) \
     && !defined(__SOFTFP__)
-  answer |= 1u << VFP3 | 1u << ARMv7;
+  answer |= 1u << VFP3 | 1u << ARMv7 | 1u << VFP2;
 #endif  // defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(__VFP_FP__)
         // && !defined(__SOFTFP__)
-#endif  // def __arm__
+#endif  // _arm__
 
   return answer;
 }
@@ -101,27 +104,32 @@ void CpuFeatures::Probe() {
   // For the simulator=arm build, use VFP when FLAG_enable_vfp3 is
   // enabled. VFPv3 implies ARMv7, see ARM DDI 0406B, page A1-6.
   if (FLAG_enable_vfp3) {
-    supported_ |= 1u << VFP3 | 1u << ARMv7;
+    supported_ |= 1u << VFP3 | 1u << ARMv7 | 1u << VFP2;
   }
   // For the simulator=arm build, use ARMv7 when FLAG_enable_armv7 is enabled
   if (FLAG_enable_armv7) {
     supported_ |= 1u << ARMv7;
   }
-#else  // def __arm__
+#else  // __arm__
   // Probe for additional features not already known to be available.
   if (!IsSupported(VFP3) && OS::ArmCpuHasFeature(VFP3)) {
     // This implementation also sets the VFP flags if runtime
-    // detection of VFP returns true. VFPv3 implies ARMv7, see ARM DDI
+    // detection of VFP returns true. VFPv3 implies ARMv7 and VFP2, see ARM DDI
     // 0406B, page A1-6.
-    supported_ |= 1u << VFP3 | 1u << ARMv7;
-    found_by_runtime_probing_ |= 1u << VFP3 | 1u << ARMv7;
+    found_by_runtime_probing_ |= 1u << VFP3 | 1u << ARMv7 | 1u << VFP2;
+  } else if (!IsSupported(VFP2) && OS::ArmCpuHasFeature(VFP2)) {
+    found_by_runtime_probing_ |= 1u << VFP2;
   }
 
   if (!IsSupported(ARMv7) && OS::ArmCpuHasFeature(ARMv7)) {
-    supported_ |= 1u << ARMv7;
     found_by_runtime_probing_ |= 1u << ARMv7;
   }
+
+  supported_ |= found_by_runtime_probing_;
 #endif
+
+  // Assert that VFP3 implies VFP2 and ARMv7.
+  ASSERT(!IsSupported(VFP3) || (IsSupported(VFP2) && IsSupported(ARMv7)));
 }
 
 
@@ -1656,7 +1664,7 @@ void Assembler::vldr(const DwVfpRegister dst,
   // Instruction details available in ARM DDI 0406A, A8-628.
   // cond(31-28) | 1101(27-24)| U001(23-20) | Rbase(19-16) |
   // Vdst(15-12) | 1011(11-8) | offset
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   int u = 1;
   if (offset < 0) {
     offset = -offset;
@@ -1698,7 +1706,7 @@ void Assembler::vldr(const SwVfpRegister dst,
   // Instruction details available in ARM DDI 0406A, A8-628.
   // cond(31-28) | 1101(27-24)| U001(23-20) | Rbase(19-16) |
   // Vdst(15-12) | 1010(11-8) | offset
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   int u = 1;
   if (offset < 0) {
     offset = -offset;
@@ -1742,7 +1750,7 @@ void Assembler::vstr(const DwVfpRegister src,
   // Instruction details available in ARM DDI 0406A, A8-786.
   // cond(31-28) | 1101(27-24)| U000(23-20) | | Rbase(19-16) |
   // Vsrc(15-12) | 1011(11-8) | (offset/4)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   int u = 1;
   if (offset < 0) {
     offset = -offset;
@@ -1783,7 +1791,7 @@ void Assembler::vstr(const SwVfpRegister src,
   // Instruction details available in ARM DDI 0406A, A8-786.
   // cond(31-28) | 1101(27-24)| U000(23-20) | Rbase(19-16) |
   // Vdst(15-12) | 1010(11-8) | (offset/4)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   int u = 1;
   if (offset < 0) {
     offset = -offset;
@@ -1826,7 +1834,7 @@ void  Assembler::vldm(BlockAddrMode am,
   // Instruction details available in ARM DDI 0406A, A8-626.
   // cond(31-28) | 110(27-25)| PUDW1(24-20) | Rbase(19-16) |
   // first(15-12) | 1010(11-8) | (count * 2)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   ASSERT_LE(first.code(), last.code());
   ASSERT(am == ia || am == ia_w || am == db_w);
   ASSERT(!base.is(pc));
@@ -1847,7 +1855,7 @@ void  Assembler::vstm(BlockAddrMode am,
   // Instruction details available in ARM DDI 0406A, A8-784.
   // cond(31-28) | 110(27-25)| PUDW0(24-20) | Rbase(19-16) |
   // first(15-12) | 1011(11-8) | (count * 2)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   ASSERT_LE(first.code(), last.code());
   ASSERT(am == ia || am == ia_w || am == db_w);
   ASSERT(!base.is(pc));
@@ -1867,7 +1875,7 @@ void  Assembler::vldm(BlockAddrMode am,
   // Instruction details available in ARM DDI 0406A, A8-626.
   // cond(31-28) | 110(27-25)| PUDW1(24-20) | Rbase(19-16) |
   // first(15-12) | 1010(11-8) | (count/2)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   ASSERT_LE(first.code(), last.code());
   ASSERT(am == ia || am == ia_w || am == db_w);
   ASSERT(!base.is(pc));
@@ -1888,7 +1896,7 @@ void  Assembler::vstm(BlockAddrMode am,
   // Instruction details available in ARM DDI 0406A, A8-784.
   // cond(31-28) | 110(27-25)| PUDW0(24-20) | Rbase(19-16) |
   // first(15-12) | 1011(11-8) | (count/2)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   ASSERT_LE(first.code(), last.code());
   ASSERT(am == ia || am == ia_w || am == db_w);
   ASSERT(!base.is(pc));
@@ -1911,7 +1919,7 @@ static void DoubleAsTwoUInt32(double d, uint32_t* lo, uint32_t* hi) {
 // Only works for little endian floating point formats.
 // We don't support VFP on the mixed endian floating point platform.
 static bool FitsVMOVDoubleImmediate(double d, uint32_t *encoding) {
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsSupported(VFP3));
 
   // VMOV can accept an immediate of the form:
   //
@@ -1964,10 +1972,10 @@ void Assembler::vmov(const DwVfpRegister dst,
                      const Condition cond) {
   // Dd = immediate
   // Instruction details available in ARM DDI 0406B, A8-640.
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
 
   uint32_t enc;
-  if (FitsVMOVDoubleImmediate(imm, &enc)) {
+  if (CpuFeatures::IsSupported(VFP3) && FitsVMOVDoubleImmediate(imm, &enc)) {
     // The double can be encoded in the instruction.
     emit(cond | 0xE*B24 | 0xB*B20 | dst.code()*B12 | 0xB*B8 | enc);
   } else {
@@ -2001,7 +2009,7 @@ void Assembler::vmov(const SwVfpRegister dst,
                      const Condition cond) {
   // Sd = Sm
   // Instruction details available in ARM DDI 0406B, A8-642.
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   int sd, d, sm, m;
   dst.split_code(&sd, &d);
   src.split_code(&sm, &m);
@@ -2014,7 +2022,7 @@ void Assembler::vmov(const DwVfpRegister dst,
                      const Condition cond) {
   // Dd = Dm
   // Instruction details available in ARM DDI 0406B, A8-642.
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(cond | 0xE*B24 | 0xB*B20 |
        dst.code()*B12 | 0x5*B9 | B8 | B6 | src.code());
 }
@@ -2028,7 +2036,7 @@ void Assembler::vmov(const DwVfpRegister dst,
   // Instruction details available in ARM DDI 0406A, A8-646.
   // cond(31-28) | 1100(27-24)| 010(23-21) | op=0(20) | Rt2(19-16) |
   // Rt(15-12) | 1011(11-8) | 00(7-6) | M(5) | 1(4) | Vm
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   ASSERT(!src1.is(pc) && !src2.is(pc));
   emit(cond | 0xC*B24 | B22 | src2.code()*B16 |
        src1.code()*B12 | 0xB*B8 | B4 | dst.code());
@@ -2043,7 +2051,7 @@ void Assembler::vmov(const Register dst1,
   // Instruction details available in ARM DDI 0406A, A8-646.
   // cond(31-28) | 1100(27-24)| 010(23-21) | op=1(20) | Rt2(19-16) |
   // Rt(15-12) | 1011(11-8) | 00(7-6) | M(5) | 1(4) | Vm
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   ASSERT(!dst1.is(pc) && !dst2.is(pc));
   emit(cond | 0xC*B24 | B22 | B20 | dst2.code()*B16 |
        dst1.code()*B12 | 0xB*B8 | B4 | src.code());
@@ -2057,7 +2065,7 @@ void Assembler::vmov(const SwVfpRegister dst,
   // Instruction details available in ARM DDI 0406A, A8-642.
   // cond(31-28) | 1110(27-24)| 000(23-21) | op=0(20) | Vn(19-16) |
   // Rt(15-12) | 1010(11-8) | N(7)=0 | 00(6-5) | 1(4) | 0000(3-0)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   ASSERT(!src.is(pc));
   int sn, n;
   dst.split_code(&sn, &n);
@@ -2072,7 +2080,7 @@ void Assembler::vmov(const Register dst,
   // Instruction details available in ARM DDI 0406A, A8-642.
   // cond(31-28) | 1110(27-24)| 000(23-21) | op=1(20) | Vn(19-16) |
   // Rt(15-12) | 1010(11-8) | N(7)=0 | 00(6-5) | 1(4) | 0000(3-0)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   ASSERT(!dst.is(pc));
   int sn, n;
   src.split_code(&sn, &n);
@@ -2197,7 +2205,7 @@ void Assembler::vcvt_f64_s32(const DwVfpRegister dst,
                              const SwVfpRegister src,
                              VFPConversionMode mode,
                              const Condition cond) {
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(EncodeVCVT(F64, dst.code(), S32, src.code(), mode, cond));
 }
 
@@ -2206,7 +2214,7 @@ void Assembler::vcvt_f32_s32(const SwVfpRegister dst,
                              const SwVfpRegister src,
                              VFPConversionMode mode,
                              const Condition cond) {
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(EncodeVCVT(F32, dst.code(), S32, src.code(), mode, cond));
 }
 
@@ -2215,7 +2223,7 @@ void Assembler::vcvt_f64_u32(const DwVfpRegister dst,
                              const SwVfpRegister src,
                              VFPConversionMode mode,
                              const Condition cond) {
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(EncodeVCVT(F64, dst.code(), U32, src.code(), mode, cond));
 }
 
@@ -2224,7 +2232,7 @@ void Assembler::vcvt_s32_f64(const SwVfpRegister dst,
                              const DwVfpRegister src,
                              VFPConversionMode mode,
                              const Condition cond) {
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(EncodeVCVT(S32, dst.code(), F64, src.code(), mode, cond));
 }
 
@@ -2233,7 +2241,7 @@ void Assembler::vcvt_u32_f64(const SwVfpRegister dst,
                              const DwVfpRegister src,
                              VFPConversionMode mode,
                              const Condition cond) {
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(EncodeVCVT(U32, dst.code(), F64, src.code(), mode, cond));
 }
 
@@ -2242,7 +2250,7 @@ void Assembler::vcvt_f64_f32(const DwVfpRegister dst,
                              const SwVfpRegister src,
                              VFPConversionMode mode,
                              const Condition cond) {
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(EncodeVCVT(F64, dst.code(), F32, src.code(), mode, cond));
 }
 
@@ -2251,7 +2259,7 @@ void Assembler::vcvt_f32_f64(const SwVfpRegister dst,
                              const DwVfpRegister src,
                              VFPConversionMode mode,
                              const Condition cond) {
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(EncodeVCVT(F32, dst.code(), F64, src.code(), mode, cond));
 }
 
@@ -2259,6 +2267,7 @@ void Assembler::vcvt_f32_f64(const SwVfpRegister dst,
 void Assembler::vneg(const DwVfpRegister dst,
                      const DwVfpRegister src,
                      const Condition cond) {
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(cond | 0xE*B24 | 0xB*B20 | B16 | dst.code()*B12 |
        0x5*B9 | B8 | B6 | src.code());
 }
@@ -2267,6 +2276,7 @@ void Assembler::vneg(const DwVfpRegister dst,
 void Assembler::vabs(const DwVfpRegister dst,
                      const DwVfpRegister src,
                      const Condition cond) {
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(cond | 0xE*B24 | 0xB*B20 | dst.code()*B12 |
        0x5*B9 | B8 | 0x3*B6 | src.code());
 }
@@ -2281,7 +2291,7 @@ void Assembler::vadd(const DwVfpRegister dst,
   // Instruction details available in ARM DDI 0406A, A8-536.
   // cond(31-28) | 11100(27-23)| D=?(22) | 11(21-20) | Vn(19-16) |
   // Vd(15-12) | 101(11-9) | sz(8)=1 | N(7)=0 | 0(6) | M=?(5) | 0(4) | Vm(3-0)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(cond | 0xE*B24 | 0x3*B20 | src1.code()*B16 |
        dst.code()*B12 | 0x5*B9 | B8 | src2.code());
 }
@@ -2296,7 +2306,7 @@ void Assembler::vsub(const DwVfpRegister dst,
   // Instruction details available in ARM DDI 0406A, A8-784.
   // cond(31-28) | 11100(27-23)| D=?(22) | 11(21-20) | Vn(19-16) |
   // Vd(15-12) | 101(11-9) | sz(8)=1 | N(7)=0 | 1(6) | M=?(5) | 0(4) | Vm(3-0)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(cond | 0xE*B24 | 0x3*B20 | src1.code()*B16 |
        dst.code()*B12 | 0x5*B9 | B8 | B6 | src2.code());
 }
@@ -2311,7 +2321,7 @@ void Assembler::vmul(const DwVfpRegister dst,
   // Instruction details available in ARM DDI 0406A, A8-784.
   // cond(31-28) | 11100(27-23)| D=?(22) | 10(21-20) | Vn(19-16) |
   // Vd(15-12) | 101(11-9) | sz(8)=1 | N(7)=0 | 0(6) | M=?(5) | 0(4) | Vm(3-0)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(cond | 0xE*B24 | 0x2*B20 | src1.code()*B16 |
        dst.code()*B12 | 0x5*B9 | B8 | src2.code());
 }
@@ -2326,7 +2336,7 @@ void Assembler::vdiv(const DwVfpRegister dst,
   // Instruction details available in ARM DDI 0406A, A8-584.
   // cond(31-28) | 11101(27-23)| D=?(22) | 00(21-20) | Vn(19-16) |
   // Vd(15-12) | 101(11-9) | sz(8)=1 | N(7)=? | 0(6) | M=?(5) | 0(4) | Vm(3-0)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(cond | 0xE*B24 | B23 | src1.code()*B16 |
        dst.code()*B12 | 0x5*B9 | B8 | src2.code());
 }
@@ -2339,7 +2349,7 @@ void Assembler::vcmp(const DwVfpRegister src1,
   // Instruction details available in ARM DDI 0406A, A8-570.
   // cond(31-28) | 11101 (27-23)| D=?(22) | 11 (21-20) | 0100 (19-16) |
   // Vd(15-12) | 101(11-9) | sz(8)=1 | E(7)=0 | 1(6) | M(5)=? | 0(4) | Vm(3-0)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(cond | 0xE*B24 |B23 | 0x3*B20 | B18 |
        src1.code()*B12 | 0x5*B9 | B8 | B6 | src2.code());
 }
@@ -2352,7 +2362,7 @@ void Assembler::vcmp(const DwVfpRegister src1,
   // Instruction details available in ARM DDI 0406A, A8-570.
   // cond(31-28) | 11101 (27-23)| D=?(22) | 11 (21-20) | 0101 (19-16) |
   // Vd(15-12) | 101(11-9) | sz(8)=1 | E(7)=0 | 1(6) | M(5)=? | 0(4) | 0000(3-0)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   ASSERT(src2 == 0.0);
   emit(cond | 0xE*B24 |B23 | 0x3*B20 | B18 | B16 |
        src1.code()*B12 | 0x5*B9 | B8 | B6);
@@ -2363,7 +2373,7 @@ void Assembler::vmsr(Register dst, Condition cond) {
   // Instruction details available in ARM DDI 0406A, A8-652.
   // cond(31-28) | 1110 (27-24) | 1110(23-20)| 0001 (19-16) |
   // Rt(15-12) | 1010 (11-8) | 0(7) | 00 (6-5) | 1(4) | 0000(3-0)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(cond | 0xE*B24 | 0xE*B20 |  B16 |
        dst.code()*B12 | 0xA*B8 | B4);
 }
@@ -2373,7 +2383,7 @@ void Assembler::vmrs(Register dst, Condition cond) {
   // Instruction details available in ARM DDI 0406A, A8-652.
   // cond(31-28) | 1110 (27-24) | 1111(23-20)| 0001 (19-16) |
   // Rt(15-12) | 1010 (11-8) | 0(7) | 00 (6-5) | 1(4) | 0000(3-0)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(cond | 0xE*B24 | 0xF*B20 |  B16 |
        dst.code()*B12 | 0xA*B8 | B4);
 }
@@ -2384,7 +2394,7 @@ void Assembler::vsqrt(const DwVfpRegister dst,
                       const Condition cond) {
   // cond(31-28) | 11101 (27-23)| D=?(22) | 11 (21-20) | 0001 (19-16) |
   // Vd(15-12) | 101(11-9) | sz(8)=1 | 11 (7-6) | M(5)=? | 0(4) | Vm(3-0)
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   emit(cond | 0xE*B24 | B23 | 0x3*B20 | B16 |
        dst.code()*B12 | 0x5*B9 | B8 | 3*B6 | src.code());
 }
diff --git a/deps/v8/src/arm/assembler-arm.h b/deps/v8/src/arm/assembler-arm.h
index e2d5f598b7..e0518ef77c 100644
--- a/deps/v8/src/arm/assembler-arm.h
+++ b/deps/v8/src/arm/assembler-arm.h
@@ -510,6 +510,7 @@ class CpuFeatures : public AllStatic {
   static bool IsSupported(CpuFeature f) {
     ASSERT(initialized_);
     if (f == VFP3 && !FLAG_enable_vfp3) return false;
+    if (f == VFP2 && !FLAG_enable_vfp2) return false;
     return (supported_ & (1u << f)) != 0;
   }
 
@@ -535,6 +536,8 @@ class CpuFeatures : public AllStatic {
    public:
     explicit Scope(CpuFeature f) {
       unsigned mask = 1u << f;
+      // VFP2 and ARMv7 are implied by VFP3.
+      if (f == VFP3) mask |= 1u << VFP2 | 1u << ARMv7;
       ASSERT(CpuFeatures::IsSupported(f));
       ASSERT(!Serializer::enabled() ||
              (CpuFeatures::found_by_runtime_probing_ & mask) == 0);
diff --git a/deps/v8/src/arm/builtins-arm.cc b/deps/v8/src/arm/builtins-arm.cc
index 578bd810d4..9cacac0b03 100644
--- a/deps/v8/src/arm/builtins-arm.cc
+++ b/deps/v8/src/arm/builtins-arm.cc
@@ -1246,10 +1246,7 @@ void Builtins::Generate_NotifyOSR(MacroAssembler* masm) {
 
 void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
   CpuFeatures::TryForceFeatureScope scope(VFP3);
-  if (!CpuFeatures::IsSupported(VFP3)) {
-    __ Abort("Unreachable code: Cannot optimize without VFP3 support.");
-    return;
-  }
+  ASSERT(CPU::SupportsCrankshaft());
 
   // Lookup the function in the JavaScript frame and push it as an
   // argument to the on-stack replacement function.
diff --git a/deps/v8/src/arm/code-stubs-arm.cc b/deps/v8/src/arm/code-stubs-arm.cc
index 761123f639..3f0846ac6b 100644
--- a/deps/v8/src/arm/code-stubs-arm.cc
+++ b/deps/v8/src/arm/code-stubs-arm.cc
@@ -519,8 +519,8 @@ void FloatingPointHelper::LoadSmis(MacroAssembler* masm,
                                    FloatingPointHelper::Destination destination,
                                    Register scratch1,
                                    Register scratch2) {
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
     __ mov(scratch1, Operand(r0, ASR, kSmiTagSize));
     __ vmov(d7.high(), scratch1);
     __ vcvt_f64_s32(d7, d7.high());
@@ -589,9 +589,9 @@ void FloatingPointHelper::LoadNumber(MacroAssembler* masm,
   __ JumpIfNotHeapNumber(object, heap_number_map, scratch1, not_number);
 
   // Handle loading a double from a heap number.
-  if (CpuFeatures::IsSupported(VFP3) &&
+  if (CpuFeatures::IsSupported(VFP2) &&
       destination == kVFPRegisters) {
-    CpuFeatures::Scope scope(VFP3);
+    CpuFeatures::Scope scope(VFP2);
     // Load the double from tagged HeapNumber to double register.
     __ sub(scratch1, object, Operand(kHeapObjectTag));
     __ vldr(dst, scratch1, HeapNumber::kValueOffset);
@@ -604,8 +604,8 @@ void FloatingPointHelper::LoadNumber(MacroAssembler* masm,
 
   // Handle loading a double from a smi.
   __ bind(&is_smi);
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
     // Convert smi to double using VFP instructions.
     __ vmov(dst.high(), scratch1);
     __ vcvt_f64_s32(dst, dst.high());
@@ -682,8 +682,8 @@ void FloatingPointHelper::ConvertIntToDouble(MacroAssembler* masm,
 
   Label done;
 
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
     __ vmov(single_scratch, int_scratch);
     __ vcvt_f64_s32(double_dst, single_scratch);
     if (destination == kCoreRegisters) {
@@ -776,8 +776,8 @@ void FloatingPointHelper::LoadNumberAsInt32Double(MacroAssembler* masm,
   __ JumpIfNotHeapNumber(object, heap_number_map, scratch1, not_int32);
 
   // Load the number.
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
     // Load the double value.
     __ sub(scratch1, object, Operand(kHeapObjectTag));
     __ vldr(double_dst, scratch1, HeapNumber::kValueOffset);
@@ -847,8 +847,8 @@ void FloatingPointHelper::LoadNumberAsInt32(MacroAssembler* masm,
 
   // Object is a heap number.
   // Convert the floating point value to a 32-bit integer.
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
     SwVfpRegister single_scratch = double_scratch.low();
     // Load the double value.
     __ sub(scratch1, object, Operand(kHeapObjectTag));
@@ -978,7 +978,7 @@ void FloatingPointHelper::CallCCodeForDoubleOperation(
   __ push(lr);
   __ PrepareCallCFunction(0, 2, scratch);
   if (masm->use_eabi_hardfloat()) {
-    CpuFeatures::Scope scope(VFP3);
+    CpuFeatures::Scope scope(VFP2);
     __ vmov(d0, r0, r1);
     __ vmov(d1, r2, r3);
   }
@@ -990,7 +990,7 @@ void FloatingPointHelper::CallCCodeForDoubleOperation(
   // Store answer in the overwritable heap number. Double returned in
   // registers r0 and r1 or in d0.
   if (masm->use_eabi_hardfloat()) {
-    CpuFeatures::Scope scope(VFP3);
+    CpuFeatures::Scope scope(VFP2);
     __ vstr(d0,
             FieldMemOperand(heap_number_result, HeapNumber::kValueOffset));
   } else {
@@ -1209,9 +1209,9 @@ static void EmitSmiNonsmiComparison(MacroAssembler* masm,
   }
 
   // Lhs is a smi, rhs is a number.
-  if (CpuFeatures::IsSupported(VFP3)) {
+  if (CpuFeatures::IsSupported(VFP2)) {
     // Convert lhs to a double in d7.
-    CpuFeatures::Scope scope(VFP3);
+    CpuFeatures::Scope scope(VFP2);
     __ SmiToDoubleVFPRegister(lhs, d7, r7, s15);
     // Load the double from rhs, tagged HeapNumber r0, to d6.
     __ sub(r7, rhs, Operand(kHeapObjectTag));
@@ -1249,8 +1249,8 @@ static void EmitSmiNonsmiComparison(MacroAssembler* masm,
   }
 
   // Rhs is a smi, lhs is a heap number.
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
     // Load the double from lhs, tagged HeapNumber r1, to d7.
     __ sub(r7, lhs, Operand(kHeapObjectTag));
     __ vldr(d7, r7, HeapNumber::kValueOffset);
@@ -1362,7 +1362,7 @@ static void EmitTwoNonNanDoubleComparison(MacroAssembler* masm,
     __ push(lr);
     __ PrepareCallCFunction(0, 2, r5);
     if (masm->use_eabi_hardfloat()) {
-      CpuFeatures::Scope scope(VFP3);
+      CpuFeatures::Scope scope(VFP2);
       __ vmov(d0, r0, r1);
       __ vmov(d1, r2, r3);
     }
@@ -1437,8 +1437,8 @@ static void EmitCheckForTwoHeapNumbers(MacroAssembler* masm,
 
   // Both are heap numbers.  Load them up then jump to the code we have
   // for that.
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
     __ sub(r7, rhs, Operand(kHeapObjectTag));
     __ vldr(d6, r7, HeapNumber::kValueOffset);
     __ sub(r7, lhs, Operand(kHeapObjectTag));
@@ -1527,8 +1527,8 @@ void NumberToStringStub::GenerateLookupNumberStringCache(MacroAssembler* masm,
   Label load_result_from_cache;
   if (!object_is_smi) {
     __ JumpIfSmi(object, &is_smi);
-    if (CpuFeatures::IsSupported(VFP3)) {
-      CpuFeatures::Scope scope(VFP3);
+    if (CpuFeatures::IsSupported(VFP2)) {
+      CpuFeatures::Scope scope(VFP2);
       __ CheckMap(object,
                   scratch1,
                   Heap::kHeapNumberMapRootIndex,
@@ -1659,9 +1659,9 @@ void CompareStub::Generate(MacroAssembler* masm) {
   // The arguments have been converted to doubles and stored in d6 and d7, if
   // VFP3 is supported, or in r0, r1, r2, and r3.
   Isolate* isolate = masm->isolate();
-  if (CpuFeatures::IsSupported(VFP3)) {
+  if (CpuFeatures::IsSupported(VFP2)) {
     __ bind(&lhs_not_nan);
-    CpuFeatures::Scope scope(VFP3);
+    CpuFeatures::Scope scope(VFP2);
     Label no_nan;
     // ARMv7 VFP3 instructions to implement double precision comparison.
     __ VFPCompareAndSetFlags(d7, d6);
@@ -1780,7 +1780,7 @@ void ToBooleanStub::Generate(MacroAssembler* masm) {
   // This stub overrides SometimesSetsUpAFrame() to return false.  That means
   // we cannot call anything that could cause a GC from this stub.
   // This stub uses VFP3 instructions.
-  CpuFeatures::Scope scope(VFP3);
+  CpuFeatures::Scope scope(VFP2);
 
   Label patch;
   const Register map = r9.is(tos_) ? r7 : r9;
@@ -1892,7 +1892,7 @@ void StoreBufferOverflowStub::Generate(MacroAssembler* masm) {
   // restore them.
   __ stm(db_w, sp, kCallerSaved | lr.bit());
   if (save_doubles_ == kSaveFPRegs) {
-    CpuFeatures::Scope scope(VFP3);
+    CpuFeatures::Scope scope(VFP2);
     __ sub(sp, sp, Operand(kDoubleSize * DwVfpRegister::kNumRegisters));
     for (int i = 0; i < DwVfpRegister::kNumRegisters; i++) {
       DwVfpRegister reg = DwVfpRegister::from_code(i);
@@ -1910,7 +1910,7 @@ void StoreBufferOverflowStub::Generate(MacroAssembler* masm) {
       ExternalReference::store_buffer_overflow_function(masm->isolate()),
       argument_count);
   if (save_doubles_ == kSaveFPRegs) {
-    CpuFeatures::Scope scope(VFP3);
+    CpuFeatures::Scope scope(VFP2);
     for (int i = 0; i < DwVfpRegister::kNumRegisters; i++) {
       DwVfpRegister reg = DwVfpRegister::from_code(i);
       __ vldr(reg, MemOperand(sp, i * kDoubleSize));
@@ -2140,9 +2140,9 @@ void UnaryOpStub::GenerateHeapNumberCodeBitNot(
     __ mov(r0, r2);  // Move newly allocated heap number to r0.
   }
 
-  if (CpuFeatures::IsSupported(VFP3)) {
+  if (CpuFeatures::IsSupported(VFP2)) {
     // Convert the int32 in r1 to the heap number in r0. r2 is corrupted.
-    CpuFeatures::Scope scope(VFP3);
+    CpuFeatures::Scope scope(VFP2);
     __ vmov(s0, r1);
     __ vcvt_f64_s32(d0, s0);
     __ sub(r2, r0, Operand(kHeapObjectTag));
@@ -2442,7 +2442,7 @@ void BinaryOpStub::GenerateFPOperation(MacroAssembler* masm,
       // Load left and right operands into d6 and d7 or r0/r1 and r2/r3
       // depending on whether VFP3 is available or not.
       FloatingPointHelper::Destination destination =
-          CpuFeatures::IsSupported(VFP3) &&
+          CpuFeatures::IsSupported(VFP2) &&
           op_ != Token::MOD ?
           FloatingPointHelper::kVFPRegisters :
           FloatingPointHelper::kCoreRegisters;
@@ -2469,7 +2469,7 @@ void BinaryOpStub::GenerateFPOperation(MacroAssembler* masm,
         // Using VFP registers:
         // d6: Left value
         // d7: Right value
-        CpuFeatures::Scope scope(VFP3);
+        CpuFeatures::Scope scope(VFP2);
         switch (op_) {
           case Token::ADD:
             __ vadd(d5, d6, d7);
@@ -2558,7 +2558,7 @@ void BinaryOpStub::GenerateFPOperation(MacroAssembler* masm,
           // The code below for writing into heap numbers isn't capable of
           // writing the register as an unsigned int so we go to slow case if we
           // hit this case.
-          if (CpuFeatures::IsSupported(VFP3)) {
+          if (CpuFeatures::IsSupported(VFP2)) {
             __ b(mi, &result_not_a_smi);
           } else {
             __ b(mi, not_numbers);
@@ -2597,10 +2597,10 @@ void BinaryOpStub::GenerateFPOperation(MacroAssembler* masm,
       // result.
       __ mov(r0, Operand(r5));
 
-      if (CpuFeatures::IsSupported(VFP3)) {
+      if (CpuFeatures::IsSupported(VFP2)) {
         // Convert the int32 in r2 to the heap number in r0. r3 is corrupted. As
         // mentioned above SHR needs to always produce a positive result.
-        CpuFeatures::Scope scope(VFP3);
+        CpuFeatures::Scope scope(VFP2);
         __ vmov(s0, r2);
         if (op_ == Token::SHR) {
           __ vcvt_f64_u32(d0, s0);
@@ -2759,7 +2759,7 @@ void BinaryOpStub::GenerateInt32Stub(MacroAssembler* masm) {
       // Jump to type transition if they are not. The registers r0 and r1 (right
       // and left) are preserved for the runtime call.
       FloatingPointHelper::Destination destination =
-          (CpuFeatures::IsSupported(VFP3) && op_ != Token::MOD)
+          (CpuFeatures::IsSupported(VFP2) && op_ != Token::MOD)
               ? FloatingPointHelper::kVFPRegisters
               : FloatingPointHelper::kCoreRegisters;
 
@@ -2787,7 +2787,7 @@ void BinaryOpStub::GenerateInt32Stub(MacroAssembler* masm) {
                                                    &transition);
 
       if (destination == FloatingPointHelper::kVFPRegisters) {
-        CpuFeatures::Scope scope(VFP3);
+        CpuFeatures::Scope scope(VFP2);
         Label return_heap_number;
         switch (op_) {
           case Token::ADD:
@@ -2954,9 +2954,9 @@ void BinaryOpStub::GenerateInt32Stub(MacroAssembler* masm) {
           // We only get a negative result if the shift value (r2) is 0.
           // This result cannot be respresented as a signed 32-bit integer, try
           // to return a heap number if we can.
-          // The non vfp3 code does not support this special case, so jump to
+          // The non vfp2 code does not support this special case, so jump to
           // runtime if we don't support it.
-          if (CpuFeatures::IsSupported(VFP3)) {
+          if (CpuFeatures::IsSupported(VFP2)) {
             __ b(mi, (result_type_ <= BinaryOpIC::INT32)
                       ? &transition
                       : &return_heap_number);
@@ -2991,8 +2991,8 @@ void BinaryOpStub::GenerateInt32Stub(MacroAssembler* masm) {
                                    scratch2,
                                    &call_runtime);
 
-      if (CpuFeatures::IsSupported(VFP3)) {
-        CpuFeatures::Scope scope(VFP3);
+      if (CpuFeatures::IsSupported(VFP2)) {
+        CpuFeatures::Scope scope(VFP2);
         if (op_ != Token::SHR) {
           // Convert the result to a floating point value.
           __ vmov(double_scratch.low(), r2);
@@ -3221,8 +3221,8 @@ void TranscendentalCacheStub::Generate(MacroAssembler* masm) {
   const Register cache_entry = r0;
   const bool tagged = (argument_type_ == TAGGED);
 
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
     if (tagged) {
       // Argument is a number and is on stack and in r0.
       // Load argument and check if it is a smi.
@@ -3385,6 +3385,7 @@ void TranscendentalCacheStub::Generate(MacroAssembler* masm) {
 
 void TranscendentalCacheStub::GenerateCallCFunction(MacroAssembler* masm,
                                                     Register scratch) {
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   Isolate* isolate = masm->isolate();
 
   __ push(lr);
@@ -3445,7 +3446,7 @@ void InterruptStub::Generate(MacroAssembler* masm) {
 
 
 void MathPowStub::Generate(MacroAssembler* masm) {
-  CpuFeatures::Scope vfp3_scope(VFP3);
+  CpuFeatures::Scope vfp2_scope(VFP2);
   const Register base = r1;
   const Register exponent = r2;
   const Register heapnumbermap = r5;
@@ -3544,7 +3545,7 @@ void MathPowStub::Generate(MacroAssembler* masm) {
 
       // Add +0 to convert -0 to +0.
       __ vadd(double_scratch, double_base, kDoubleRegZero);
-      __ vmov(double_result, 1);
+      __ vmov(double_result, 1.0);
       __ vsqrt(double_scratch, double_scratch);
       __ vdiv(double_result, double_result, double_scratch);
       __ jmp(&done);
@@ -3901,8 +3902,8 @@ void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
   // Save callee-saved registers (incl. cp and fp), sp, and lr
   __ stm(db_w, sp, kCalleeSaved | lr.bit());
 
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
     // Save callee-saved vfp registers.
     __ vstm(db_w, sp, kFirstCalleeSavedDoubleReg, kLastCalleeSavedDoubleReg);
     // Set up the reserved register for 0.0.
@@ -3917,7 +3918,7 @@ void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
 
   // Set up argv in r4.
   int offset_to_argv = (kNumCalleeSaved + 1) * kPointerSize;
-  if (CpuFeatures::IsSupported(VFP3)) {
+  if (CpuFeatures::IsSupported(VFP2)) {
     offset_to_argv += kNumDoubleCalleeSaved * kDoubleSize;
   }
   __ ldr(r4, MemOperand(sp, offset_to_argv));
@@ -4055,8 +4056,8 @@ void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
   }
 #endif
 
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
     // Restore callee-saved vfp registers.
     __ vldm(ia_w, sp, kFirstCalleeSavedDoubleReg, kLastCalleeSavedDoubleReg);
   }
@@ -6583,8 +6584,8 @@ void ICCompareStub::GenerateHeapNumbers(MacroAssembler* masm) {
 
   // Inlining the double comparison and falling back to the general compare
   // stub if NaN is involved or VFP3 is unsupported.
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
 
     // Load left and right operand
     __ sub(r2, r1, Operand(kHeapObjectTag));
diff --git a/deps/v8/src/arm/code-stubs-arm.h b/deps/v8/src/arm/code-stubs-arm.h
index 38ed476cc1..3ddc405715 100644
--- a/deps/v8/src/arm/code-stubs-arm.h
+++ b/deps/v8/src/arm/code-stubs-arm.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -149,7 +149,7 @@ class BinaryOpStub: public CodeStub {
         mode_(mode),
         operands_type_(BinaryOpIC::UNINITIALIZED),
         result_type_(BinaryOpIC::UNINITIALIZED) {
-    use_vfp3_ = CpuFeatures::IsSupported(VFP3);
+    use_vfp2_ = CpuFeatures::IsSupported(VFP2);
     ASSERT(OpBits::is_valid(Token::NUM_TOKENS));
   }
 
@@ -159,7 +159,7 @@ class BinaryOpStub: public CodeStub {
       BinaryOpIC::TypeInfo result_type = BinaryOpIC::UNINITIALIZED)
       : op_(OpBits::decode(key)),
         mode_(ModeBits::decode(key)),
-        use_vfp3_(VFP3Bits::decode(key)),
+        use_vfp2_(VFP2Bits::decode(key)),
         operands_type_(operands_type),
         result_type_(result_type) { }
 
@@ -171,7 +171,7 @@ class BinaryOpStub: public CodeStub {
 
   Token::Value op_;
   OverwriteMode mode_;
-  bool use_vfp3_;
+  bool use_vfp2_;
 
   // Operand type information determined at runtime.
   BinaryOpIC::TypeInfo operands_type_;
@@ -182,7 +182,7 @@ class BinaryOpStub: public CodeStub {
   // Minor key encoding in 16 bits RRRTTTVOOOOOOOMM.
   class ModeBits: public BitField<OverwriteMode, 0, 2> {};
   class OpBits: public BitField<Token::Value, 2, 7> {};
-  class VFP3Bits: public BitField<bool, 9, 1> {};
+  class VFP2Bits: public BitField<bool, 9, 1> {};
   class OperandTypeInfoBits: public BitField<BinaryOpIC::TypeInfo, 10, 3> {};
   class ResultTypeInfoBits: public BitField<BinaryOpIC::TypeInfo, 13, 3> {};
 
@@ -190,7 +190,7 @@ class BinaryOpStub: public CodeStub {
   int MinorKey() {
     return OpBits::encode(op_)
            | ModeBits::encode(mode_)
-           | VFP3Bits::encode(use_vfp3_)
+           | VFP2Bits::encode(use_vfp2_)
            | OperandTypeInfoBits::encode(operands_type_)
            | ResultTypeInfoBits::encode(result_type_);
   }
@@ -571,7 +571,7 @@ class RecordWriteStub: public CodeStub {
     void SaveCallerSaveRegisters(MacroAssembler* masm, SaveFPRegsMode mode) {
       masm->stm(db_w, sp, (kCallerSaved | lr.bit()) & ~scratch1_.bit());
       if (mode == kSaveFPRegs) {
-        CpuFeatures::Scope scope(VFP3);
+        CpuFeatures::Scope scope(VFP2);
         masm->sub(sp,
                   sp,
                   Operand(kDoubleSize * (DwVfpRegister::kNumRegisters - 1)));
@@ -586,7 +586,7 @@ class RecordWriteStub: public CodeStub {
     inline void RestoreCallerSaveRegisters(MacroAssembler*masm,
                                            SaveFPRegsMode mode) {
       if (mode == kSaveFPRegs) {
-        CpuFeatures::Scope scope(VFP3);
+        CpuFeatures::Scope scope(VFP2);
         // Restore all VFP registers except d0.
         for (int i = DwVfpRegister::kNumRegisters - 1; i > 0; i--) {
           DwVfpRegister reg = DwVfpRegister::from_code(i);
diff --git a/deps/v8/src/arm/codegen-arm.cc b/deps/v8/src/arm/codegen-arm.cc
index e00afb9035..3bdee1f945 100644
--- a/deps/v8/src/arm/codegen-arm.cc
+++ b/deps/v8/src/arm/codegen-arm.cc
@@ -107,7 +107,7 @@ void ElementsTransitionGenerator::GenerateSmiToDouble(
   //  -- r4    : scratch (elements)
   // -----------------------------------
   Label loop, entry, convert_hole, gc_required, only_change_map, done;
-  bool vfp3_supported = CpuFeatures::IsSupported(VFP3);
+  bool vfp2_supported = CpuFeatures::IsSupported(VFP2);
 
   // Check for empty arrays, which only require a map transition and no changes
   // to the backing store.
@@ -163,7 +163,7 @@ void ElementsTransitionGenerator::GenerateSmiToDouble(
   // r5: kHoleNanUpper32
   // r6: end of destination FixedDoubleArray, not tagged
   // r7: begin of FixedDoubleArray element fields, not tagged
-  if (!vfp3_supported) __ Push(r1, r0);
+  if (!vfp2_supported) __ Push(r1, r0);
 
   __ b(&entry);
 
@@ -191,8 +191,8 @@ void ElementsTransitionGenerator::GenerateSmiToDouble(
   __ UntagAndJumpIfNotSmi(r9, r9, &convert_hole);
 
   // Normal smi, convert to double and store.
-  if (vfp3_supported) {
-    CpuFeatures::Scope scope(VFP3);
+  if (vfp2_supported) {
+    CpuFeatures::Scope scope(VFP2);
     __ vmov(s0, r9);
     __ vcvt_f64_s32(d0, s0);
     __ vstr(d0, r7, 0);
@@ -225,7 +225,7 @@ void ElementsTransitionGenerator::GenerateSmiToDouble(
   __ cmp(r7, r6);
   __ b(lt, &loop);
 
-  if (!vfp3_supported) __ Pop(r1, r0);
+  if (!vfp2_supported) __ Pop(r1, r0);
   __ pop(lr);
   __ bind(&done);
 }
diff --git a/deps/v8/src/arm/full-codegen-arm.cc b/deps/v8/src/arm/full-codegen-arm.cc
index ff7c3c139e..fbdb93082a 100644
--- a/deps/v8/src/arm/full-codegen-arm.cc
+++ b/deps/v8/src/arm/full-codegen-arm.cc
@@ -675,7 +675,7 @@ void FullCodeGenerator::DoTest(Expression* condition,
                                Label* if_true,
                                Label* if_false,
                                Label* fall_through) {
-  if (CpuFeatures::IsSupported(VFP3)) {
+  if (CpuFeatures::IsSupported(VFP2)) {
     ToBooleanStub stub(result_register());
     __ CallStub(&stub);
     __ tst(result_register(), result_register());
@@ -3052,13 +3052,13 @@ void FullCodeGenerator::EmitRandomHeapNumber(CallRuntime* expr) {
   // Convert 32 random bits in r0 to 0.(32 random bits) in a double
   // by computing:
   // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
-  if (CpuFeatures::IsSupported(VFP3)) {
+  if (CpuFeatures::IsSupported(VFP2)) {
     __ PrepareCallCFunction(1, r0);
     __ ldr(r0, ContextOperand(context_register(), Context::GLOBAL_INDEX));
     __ ldr(r0, FieldMemOperand(r0, GlobalObject::kGlobalContextOffset));
     __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
 
-    CpuFeatures::Scope scope(VFP3);
+    CpuFeatures::Scope scope(VFP2);
     // 0x41300000 is the top half of 1.0 x 2^20 as a double.
     // Create this constant using mov/orr to avoid PC relative load.
     __ mov(r1, Operand(0x41000000));
@@ -3181,7 +3181,7 @@ void FullCodeGenerator::EmitMathPow(CallRuntime* expr) {
   ASSERT(args->length() == 2);
   VisitForStackValue(args->at(0));
   VisitForStackValue(args->at(1));
-  if (CpuFeatures::IsSupported(VFP3)) {
+  if (CpuFeatures::IsSupported(VFP2)) {
     MathPowStub stub(MathPowStub::ON_STACK);
     __ CallStub(&stub);
   } else {
diff --git a/deps/v8/src/arm/macro-assembler-arm.cc b/deps/v8/src/arm/macro-assembler-arm.cc
index 933399e00f..d3bda3960d 100644
--- a/deps/v8/src/arm/macro-assembler-arm.cc
+++ b/deps/v8/src/arm/macro-assembler-arm.cc
@@ -265,8 +265,8 @@ void MacroAssembler::Move(Register dst, Register src, Condition cond) {
 
 
 void MacroAssembler::Move(DoubleRegister dst, DoubleRegister src) {
-  ASSERT(CpuFeatures::IsSupported(VFP3));
-  CpuFeatures::Scope scope(VFP3);
+  ASSERT(CpuFeatures::IsSupported(VFP2));
+  CpuFeatures::Scope scope(VFP2);
   if (!dst.is(src)) {
     vmov(dst, src);
   }
@@ -778,7 +778,7 @@ void MacroAssembler::VFPCompareAndLoadFlags(const DwVfpRegister src1,
 void MacroAssembler::Vmov(const DwVfpRegister dst,
                           const double imm,
                           const Condition cond) {
-  ASSERT(CpuFeatures::IsEnabled(VFP3));
+  ASSERT(CpuFeatures::IsEnabled(VFP2));
   static const DoubleRepresentation minus_zero(-0.0);
   static const DoubleRepresentation zero(0.0);
   DoubleRepresentation value(imm);
@@ -930,6 +930,7 @@ void MacroAssembler::LeaveExitFrame(bool save_doubles,
 }
 
 void MacroAssembler::GetCFunctionDoubleResult(const DoubleRegister dst) {
+  ASSERT(CpuFeatures::IsSupported(VFP2));
   if (use_eabi_hardfloat()) {
     Move(dst, d0);
   } else {
@@ -1967,7 +1968,7 @@ void MacroAssembler::StoreNumberToDoubleElements(Register value_reg,
   // scratch1 is now effective address of the double element
 
   FloatingPointHelper::Destination destination;
-  if (CpuFeatures::IsSupported(VFP3)) {
+  if (CpuFeatures::IsSupported(VFP2)) {
     destination = FloatingPointHelper::kVFPRegisters;
   } else {
     destination = FloatingPointHelper::kCoreRegisters;
@@ -1984,7 +1985,7 @@ void MacroAssembler::StoreNumberToDoubleElements(Register value_reg,
                                           scratch4,
                                           s2);
   if (destination == FloatingPointHelper::kVFPRegisters) {
-    CpuFeatures::Scope scope(VFP3);
+    CpuFeatures::Scope scope(VFP2);
     vstr(d0, scratch1, 0);
   } else {
     str(mantissa_reg, MemOperand(scratch1, 0));
@@ -2331,8 +2332,8 @@ void MacroAssembler::ConvertToInt32(Register source,
                                     Register scratch2,
                                     DwVfpRegister double_scratch,
                                     Label *not_int32) {
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
     sub(scratch, source, Operand(kHeapObjectTag));
     vldr(double_scratch, scratch, HeapNumber::kValueOffset);
     vcvt_s32_f64(double_scratch.low(), double_scratch);
@@ -2427,8 +2428,8 @@ void MacroAssembler::EmitVFPTruncate(VFPRoundingMode rounding_mode,
                                      Register scratch1,
                                      Register scratch2,
                                      CheckForInexactConversion check_inexact) {
-  ASSERT(CpuFeatures::IsSupported(VFP3));
-  CpuFeatures::Scope scope(VFP3);
+  ASSERT(CpuFeatures::IsSupported(VFP2));
+  CpuFeatures::Scope scope(VFP2);
   Register prev_fpscr = scratch1;
   Register scratch = scratch2;
 
@@ -2546,7 +2547,7 @@ void MacroAssembler::EmitECMATruncate(Register result,
                                       Register scratch,
                                       Register input_high,
                                       Register input_low) {
-  CpuFeatures::Scope scope(VFP3);
+  CpuFeatures::Scope scope(VFP2);
   ASSERT(!input_high.is(result));
   ASSERT(!input_low.is(result));
   ASSERT(!input_low.is(input_high));
@@ -3332,6 +3333,7 @@ void MacroAssembler::PrepareCallCFunction(int num_reg_arguments,
 
 
 void MacroAssembler::SetCallCDoubleArguments(DoubleRegister dreg) {
+  ASSERT(CpuFeatures::IsSupported(VFP2));
   if (use_eabi_hardfloat()) {
     Move(d0, dreg);
   } else {
@@ -3342,6 +3344,7 @@ void MacroAssembler::SetCallCDoubleArguments(DoubleRegister dreg) {
 
 void MacroAssembler::SetCallCDoubleArguments(DoubleRegister dreg1,
                                              DoubleRegister dreg2) {
+  ASSERT(CpuFeatures::IsSupported(VFP2));
   if (use_eabi_hardfloat()) {
     if (dreg2.is(d0)) {
       ASSERT(!dreg1.is(d1));
@@ -3360,6 +3363,7 @@ void MacroAssembler::SetCallCDoubleArguments(DoubleRegister dreg1,
 
 void MacroAssembler::SetCallCDoubleArguments(DoubleRegister dreg,
                                              Register reg) {
+  ASSERT(CpuFeatures::IsSupported(VFP2));
   if (use_eabi_hardfloat()) {
     Move(d0, dreg);
     Move(r0, reg);
diff --git a/deps/v8/src/arm/stub-cache-arm.cc b/deps/v8/src/arm/stub-cache-arm.cc
index dd9de23fa4..d5e312de5c 100644
--- a/deps/v8/src/arm/stub-cache-arm.cc
+++ b/deps/v8/src/arm/stub-cache-arm.cc
@@ -986,8 +986,8 @@ static void StoreIntAsFloat(MacroAssembler* masm,
                             Register fval,
                             Register scratch1,
                             Register scratch2) {
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
     __ vmov(s0, ival);
     __ add(scratch1, dst, Operand(wordoffset, LSL, 2));
     __ vcvt_f32_s32(s0, s0);
@@ -2089,11 +2089,11 @@ Handle<Code> CallStubCompiler::CompileMathFloorCall(
   //  -- sp[argc * 4]           : receiver
   // -----------------------------------
 
-  if (!CpuFeatures::IsSupported(VFP3)) {
+  if (!CpuFeatures::IsSupported(VFP2)) {
     return Handle<Code>::null();
   }
 
-  CpuFeatures::Scope scope_vfp3(VFP3);
+  CpuFeatures::Scope scope_vfp2(VFP2);
   const int argc = arguments().immediate();
   // If the object is not a JSObject or we got an unexpected number of
   // arguments, bail out to the regular call.
@@ -3549,8 +3549,8 @@ static void GenerateSmiKeyCheck(MacroAssembler* masm,
                                 Register scratch1,
                                 DwVfpRegister double_scratch0,
                                 Label* fail) {
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
     Label key_ok;
     // Check for smi or a smi inside a heap number.  We convert the heap
     // number and check if the conversion is exact and fits into the smi
@@ -3636,8 +3636,8 @@ void KeyedLoadStubCompiler::GenerateLoadExternalArray(
       __ ldr(value, MemOperand(r3, key, LSL, 1));
       break;
     case EXTERNAL_FLOAT_ELEMENTS:
-      if (CpuFeatures::IsSupported(VFP3)) {
-        CpuFeatures::Scope scope(VFP3);
+      if (CpuFeatures::IsSupported(VFP2)) {
+        CpuFeatures::Scope scope(VFP2);
         __ add(r2, r3, Operand(key, LSL, 1));
         __ vldr(s0, r2, 0);
       } else {
@@ -3645,8 +3645,8 @@ void KeyedLoadStubCompiler::GenerateLoadExternalArray(
       }
       break;
     case EXTERNAL_DOUBLE_ELEMENTS:
-      if (CpuFeatures::IsSupported(VFP3)) {
-        CpuFeatures::Scope scope(VFP3);
+      if (CpuFeatures::IsSupported(VFP2)) {
+        CpuFeatures::Scope scope(VFP2);
         __ add(r2, r3, Operand(key, LSL, 2));
         __ vldr(d0, r2, 0);
       } else {
@@ -3697,8 +3697,8 @@ void KeyedLoadStubCompiler::GenerateLoadExternalArray(
     // Now we can use r0 for the result as key is not needed any more.
     __ mov(r0, r5);
 
-    if (CpuFeatures::IsSupported(VFP3)) {
-      CpuFeatures::Scope scope(VFP3);
+    if (CpuFeatures::IsSupported(VFP2)) {
+      CpuFeatures::Scope scope(VFP2);
       __ vmov(s0, value);
       __ vcvt_f64_s32(d0, s0);
       __ sub(r3, r0, Operand(kHeapObjectTag));
@@ -3725,8 +3725,8 @@ void KeyedLoadStubCompiler::GenerateLoadExternalArray(
     // The test is different for unsigned int values. Since we need
     // the value to be in the range of a positive smi, we can't
     // handle either of the top two bits being set in the value.
-    if (CpuFeatures::IsSupported(VFP3)) {
-      CpuFeatures::Scope scope(VFP3);
+    if (CpuFeatures::IsSupported(VFP2)) {
+      CpuFeatures::Scope scope(VFP2);
       Label box_int, done;
       __ tst(value, Operand(0xC0000000));
       __ b(ne, &box_int);
@@ -3789,8 +3789,8 @@ void KeyedLoadStubCompiler::GenerateLoadExternalArray(
   } else if (elements_kind == EXTERNAL_FLOAT_ELEMENTS) {
     // For the floating-point array type, we need to always allocate a
     // HeapNumber.
-    if (CpuFeatures::IsSupported(VFP3)) {
-      CpuFeatures::Scope scope(VFP3);
+    if (CpuFeatures::IsSupported(VFP2)) {
+      CpuFeatures::Scope scope(VFP2);
       // Allocate a HeapNumber for the result. Don't use r0 and r1 as
       // AllocateHeapNumber clobbers all registers - also when jumping due to
       // exhausted young space.
@@ -3857,8 +3857,8 @@ void KeyedLoadStubCompiler::GenerateLoadExternalArray(
       __ Ret();
     }
   } else if (elements_kind == EXTERNAL_DOUBLE_ELEMENTS) {
-    if (CpuFeatures::IsSupported(VFP3)) {
-      CpuFeatures::Scope scope(VFP3);
+    if (CpuFeatures::IsSupported(VFP2)) {
+      CpuFeatures::Scope scope(VFP2);
       // Allocate a HeapNumber for the result. Don't use r0 and r1 as
       // AllocateHeapNumber clobbers all registers - also when jumping due to
       // exhausted young space.
@@ -3983,7 +3983,7 @@ void KeyedStoreStubCompiler::GenerateStoreExternalArray(
       __ add(r3, r3, Operand(key, LSL, 2));
       // r3: effective address of the double element
       FloatingPointHelper::Destination destination;
-      if (CpuFeatures::IsSupported(VFP3)) {
+      if (CpuFeatures::IsSupported(VFP2)) {
         destination = FloatingPointHelper::kVFPRegisters;
       } else {
         destination = FloatingPointHelper::kCoreRegisters;
@@ -3993,7 +3993,7 @@ void KeyedStoreStubCompiler::GenerateStoreExternalArray(
           d0, r6, r7,  // These are: double_dst, dst1, dst2.
           r4, s2);  // These are: scratch2, single_scratch.
       if (destination == FloatingPointHelper::kVFPRegisters) {
-        CpuFeatures::Scope scope(VFP3);
+        CpuFeatures::Scope scope(VFP2);
         __ vstr(d0, r3, 0);
       } else {
         __ str(r6, MemOperand(r3, 0));
@@ -4028,8 +4028,8 @@ void KeyedStoreStubCompiler::GenerateStoreExternalArray(
     // The WebGL specification leaves the behavior of storing NaN and
     // +/-Infinity into integer arrays basically undefined. For more
     // reproducible behavior, convert these to zero.
-    if (CpuFeatures::IsSupported(VFP3)) {
-      CpuFeatures::Scope scope(VFP3);
+    if (CpuFeatures::IsSupported(VFP2)) {
+      CpuFeatures::Scope scope(VFP2);
 
       if (elements_kind == EXTERNAL_FLOAT_ELEMENTS) {
         // vldr requires offset to be a multiple of 4 so we can not
diff --git a/deps/v8/src/flag-definitions.h b/deps/v8/src/flag-definitions.h
index 2b4c53cd2d..6bb1507da2 100644
--- a/deps/v8/src/flag-definitions.h
+++ b/deps/v8/src/flag-definitions.h
@@ -263,7 +263,9 @@ DEFINE_bool(enable_sahf, true,
             "enable use of SAHF instruction if available (X64 only)")
 DEFINE_bool(enable_vfp3, true,
             "enable use of VFP3 instructions if available - this implies "
-            "enabling ARMv7 instructions (ARM only)")
+            "enabling ARMv7 and VFP2 instructions (ARM only)")
+DEFINE_bool(enable_vfp2, true,
+            "enable use of VFP2 instructions if available")
 DEFINE_bool(enable_armv7, true,
             "enable use of ARMv7 instructions if available (ARM only)")
 DEFINE_bool(enable_fpu, true,
diff --git a/deps/v8/src/platform-linux.cc b/deps/v8/src/platform-linux.cc
index f6db423e42..ed9eb79084 100644
--- a/deps/v8/src/platform-linux.cc
+++ b/deps/v8/src/platform-linux.cc
@@ -132,6 +132,9 @@ bool OS::ArmCpuHasFeature(CpuFeature feature) {
   // facility is universally available on the ARM architectures,
   // so it's up to individual OSes to provide such.
   switch (feature) {
+    case VFP2:
+      search_string = "vfp";
+      break;
     case VFP3:
       search_string = "vfpv3";
       break;
diff --git a/deps/v8/src/v8globals.h b/deps/v8/src/v8globals.h
index 6a1766a1a5..4dec1830d9 100644
--- a/deps/v8/src/v8globals.h
+++ b/deps/v8/src/v8globals.h
@@ -442,6 +442,7 @@ enum CpuFeature { SSE4_1 = 32 + 19,  // x86
                   CPUID = 10,  // x86
                   VFP3 = 1,    // ARM
                   ARMv7 = 2,   // ARM
+                  VFP2 = 3,    // ARM
                   SAHF = 0,    // x86
                   FPU = 1};    // MIPS
 
diff --git a/deps/v8/test/cctest/test-assembler-arm.cc b/deps/v8/test/cctest/test-assembler-arm.cc
index ecbf956916..cdab1b95ce 100644
--- a/deps/v8/test/cctest/test-assembler-arm.cc
+++ b/deps/v8/test/cctest/test-assembler-arm.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -642,8 +642,8 @@ TEST(8) {
   // single precision values around in memory.
   Assembler assm(Isolate::Current(), NULL, 0);
 
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
 
     __ mov(ip, Operand(sp));
     __ stm(db_w, sp, r4.bit() | fp.bit() | lr.bit());
@@ -753,8 +753,8 @@ TEST(9) {
   // single precision values around in memory.
   Assembler assm(Isolate::Current(), NULL, 0);
 
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
 
     __ mov(ip, Operand(sp));
     __ stm(db_w, sp, r4.bit() | fp.bit() | lr.bit());
@@ -868,8 +868,8 @@ TEST(10) {
   // single precision values around in memory.
   Assembler assm(Isolate::Current(), NULL, 0);
 
-  if (CpuFeatures::IsSupported(VFP3)) {
-    CpuFeatures::Scope scope(VFP3);
+  if (CpuFeatures::IsSupported(VFP2)) {
+    CpuFeatures::Scope scope(VFP2);
 
     __ mov(ip, Operand(sp));
     __ stm(db_w, sp, r4.bit() | fp.bit() | lr.bit());