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| author | Richard Earnshaw <rearnsha@arm.com> | 2012-03-22 15:14:46 +0000 |
|---|---|---|
| committer | Richard Earnshaw <rearnsha@gcc.gnu.org> | 2012-03-22 15:14:46 +0000 |
| commit | 06ea73711d68c2d07372df7e38843104886f9c45 (patch) | |
| tree | 39a882858a7cf76c5d913f7ea5e8f9711726bb3f /libgcc/config/arm/lib1funcs.S | |
| parent | b4e93f4518eccf83c79145c0b74e6c72ce9bbc0f (diff) | |
| download | gcc-06ea73711d68c2d07372df7e38843104886f9c45.tar.gz | |
lib1funcs.asm (ctzsi2): New function.
* arm/lib1funcs.asm (ctzsi2): New function.
* arm/t-elf (LIB1ASMFUNCS): Add _ctzsi2.
* arm/t-linux (LIB1ASMFUNCS): Likewise.
* arm/t-strongarm-elf (LIB1ASMFUNCS): Likewise.
* arm/t-symbian (LIB1ASMFUNCS): Likewise.
* arm/t-vxworks (LIB1ASMFUNCS): Likewise.
* arm/t-wince-pe (LIB1ASMFUNCS): Likewise.
From-SVN: r185698
Diffstat (limited to 'libgcc/config/arm/lib1funcs.S')
| -rw-r--r-- | libgcc/config/arm/lib1funcs.S | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/libgcc/config/arm/lib1funcs.S b/libgcc/config/arm/lib1funcs.S index 094d79afad6..45c3251bd70 100644 --- a/libgcc/config/arm/lib1funcs.S +++ b/libgcc/config/arm/lib1funcs.S @@ -1594,6 +1594,70 @@ ARM_FUNC_START clzdi2 #endif #endif /* L_clzdi2 */ +#ifdef L_ctzsi2 +#if defined(__ARM_ARCH_6M__) +FUNC_START ctzsi2 + neg r1, r0 + and r0, r0, r1 + mov r1, #28 + mov r3, #1 + lsl r3, r3, #16 + cmp r0, r3 /* 0x10000 */ + bcc 2f + lsr r0, r0, #16 + sub r1, r1, #16 +2: lsr r3, r3, #8 + cmp r0, r3 /* #0x100 */ + bcc 2f + lsr r0, r0, #8 + sub r1, r1, #8 +2: lsr r3, r3, #4 + cmp r0, r3 /* #0x10 */ + bcc 2f + lsr r0, r0, #4 + sub r1, r1, #4 +2: adr r2, 1f + ldrb r0, [r2, r0] + sub r0, r0, r1 + bx lr +.align 2 +1: +.byte 27, 28, 29, 29, 30, 30, 30, 30, 31, 31, 31, 31, 31, 31, 31, 31 + FUNC_END ctzsi2 +#else +ARM_FUNC_START ctzsi2 + rsb r1, r0, #0 + and r0, r0, r1 +# if defined(HAVE_ARM_CLZ) + clz r0, r0 + rsb r0, r0, #31 + RET +# else + mov r1, #28 + cmp r0, #0x10000 + do_it cs, t + movcs r0, r0, lsr #16 + subcs r1, r1, #16 + cmp r0, #0x100 + do_it cs, t + movcs r0, r0, lsr #8 + subcs r1, r1, #8 + cmp r0, #0x10 + do_it cs, t + movcs r0, r0, lsr #4 + subcs r1, r1, #4 + adr r2, 1f + ldrb r0, [r2, r0] + sub r0, r0, r1 + RET +.align 2 +1: +.byte 27, 28, 29, 29, 30, 30, 30, 30, 31, 31, 31, 31, 31, 31, 31, 31 +# endif /* !HAVE_ARM_CLZ */ + FUNC_END ctzsi2 +#endif +#endif /* L_clzsi2 */ + /* ------------------------------------------------------------------------ */ /* These next two sections are here despite the fact that they contain Thumb assembler because their presence allows interworked code to be linked even |