Merge branch 'dev' into stable

This starts Qt 5.1 release cycle

Change-Id: I892bbc73c276842894a720f761ce31ad1b015672

1 files changed, 16 insertions, 10 deletions

diff --git a/src/3rdparty/v8/src/mips/assembler-mips.cc b/src/3rdparty/v8/src/mips/assembler-mips.cc
index f347fdc..4ce924d 100644
--- a/src/3rdparty/v8/src/mips/assembler-mips.cc
+++ b/src/3rdparty/v8/src/mips/assembler-mips.cc
@@ -273,8 +273,8 @@ static const int kMinimalBufferSize = 4 * KB;
 
 Assembler::Assembler(Isolate* arg_isolate, void* buffer, int buffer_size)
     : AssemblerBase(arg_isolate),
-      positions_recorder_(this),
-      emit_debug_code_(FLAG_debug_code) {
+      recorded_ast_id_(TypeFeedbackId::None()),
+      positions_recorder_(this) {
   if (buffer == NULL) {
     // Do our own buffer management.
     if (buffer_size <= kMinimalBufferSize) {
@@ -579,17 +579,20 @@ bool Assembler::IsNop(Instr instr, unsigned int type) {
   // See Assembler::nop(type).
   ASSERT(type < 32);
   uint32_t opcode = GetOpcodeField(instr);
+  uint32_t function = GetFunctionField(instr);
   uint32_t rt = GetRt(instr);
-  uint32_t rs = GetRs(instr);
+  uint32_t rd = GetRd(instr);
   uint32_t sa = GetSa(instr);
 
-  // nop(type) == sll(zero_reg, zero_reg, type);
-  // Technically all these values will be 0 but
-  // this makes more sense to the reader.
+  // Traditional mips nop == sll(zero_reg, zero_reg, 0)
+  // When marking non-zero type, use sll(zero_reg, at, type)
+  // to avoid use of mips ssnop and ehb special encodings
+  // of the sll instruction.
 
-  bool ret = (opcode == SLL &&
-              rt == static_cast<uint32_t>(ToNumber(zero_reg)) &&
-              rs == static_cast<uint32_t>(ToNumber(zero_reg)) &&
+  Register nop_rt_reg = (type == 0) ? zero_reg : at;
+  bool ret = (opcode == SPECIAL && function == SLL &&
+              rd == static_cast<uint32_t>(ToNumber(zero_reg)) &&
+              rt == static_cast<uint32_t>(ToNumber(nop_rt_reg)) &&
               sa == type);
 
   return ret;
@@ -2046,7 +2049,10 @@ void Assembler::RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data) {
     }
     ASSERT(buffer_space() >= kMaxRelocSize);  // Too late to grow buffer here.
     if (rmode == RelocInfo::CODE_TARGET_WITH_ID) {
-      RelocInfo reloc_info_with_ast_id(pc_, rmode, RecordedAstId(), NULL);
+      RelocInfo reloc_info_with_ast_id(pc_,
+                                       rmode,
+                                       RecordedAstId().ToInt(),
+                                       NULL);
       ClearRecordedAstId();
       reloc_info_writer.Write(&reloc_info_with_ast_id);
     } else {