diff options
| author | Maciej W. Rozycki <macro@linux-mips.org> | 2015-04-03 23:25:00 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-04-08 01:09:12 +0200 |
| commit | cb5d4aad6844cdbe2f3b9f5d581ae1c9ec342009 (patch) | |
| tree | 2a20f707e1c7711f773e05746e5d8342bc576137 /arch/mips/math-emu/cp1emu.c | |
| parent | 2cfcf8a8313bd9bdb54d62ca4ea581f130869aca (diff) | |
| download | talos-op-linux-cb5d4aad6844cdbe2f3b9f5d581ae1c9ec342009.tar.gz talos-op-linux-cb5d4aad6844cdbe2f3b9f5d581ae1c9ec342009.zip | |
MIPS: bitops.h: Avoid inline asm for constant FLS
GCC is smart enough to substitute the final result for FLS calculations
as implemented in the fallback C code we have in `__fls' and `fls'
applied to constant values. The presence of inline asm defeats the
compiler though, forcing it to emit extraneous CLZ/DCLZ calculation for
processors that support these instructions.
Use `__builtin_constant_p' then to avoid inline asm altogether for
constants.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9681/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/math-emu/cp1emu.c')
0 files changed, 0 insertions, 0 deletions
