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| author | Vineet Gupta <vgupta@synopsys.com> | 2016-03-08 15:01:24 +0100 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2016-03-11 10:29:54 +0100 |
| commit | 2a41b6dc28dc71c1a3f1622612a26edc58f7561e (patch) | |
| tree | 13485c1bd93ad834ec0859e8b0112439c13beb90 /arch/arc | |
| parent | ARC: Fix misspellings in comments. (diff) | |
| download | linux-2a41b6dc28dc71c1a3f1622612a26edc58f7561e.tar.xz linux-2a41b6dc28dc71c1a3f1622612a26edc58f7561e.zip | |
ARC: bitops: Remove non relevant comments
commit 80f420842ff42 removed the ARC bitops microoptimization but failed
to prune the comments to same effect
Fixes: 80f420842ff42 ("ARC: Make ARC bitops "safer" (add anti-optimization)")
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/include/asm/bitops.h | 15 |
1 files changed, 0 insertions, 15 deletions
diff --git a/arch/arc/include/asm/bitops.h b/arch/arc/include/asm/bitops.h index 57c1f33844d4..0352fb8d21b9 100644 --- a/arch/arc/include/asm/bitops.h +++ b/arch/arc/include/asm/bitops.h @@ -35,21 +35,6 @@ static inline void op##_bit(unsigned long nr, volatile unsigned long *m)\ \ m += nr >> 5; \ \ - /* \ - * ARC ISA micro-optimization: \ - * \ - * Instructions dealing with bitpos only consider lower 5 bits \ - * e.g (x << 33) is handled like (x << 1) by ASL instruction \ - * (mem pointer still needs adjustment to point to next word) \ - * \ - * Hence the masking to clamp @nr arg can be elided in general. \ - * \ - * However if @nr is a constant (above assumed in a register), \ - * and greater than 31, gcc can optimize away (x << 33) to 0, \ - * as overflow, given the 32-bit ISA. Thus masking needs to be \ - * done for const @nr, but no code is generated due to gcc \ - * const prop. \ - */ \ nr &= 0x1f; \ \ __asm__ __volatile__( \ |