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MIPS: bitops: Only use ins for bit 16 or higher

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set_bit() can set bits 0-15 using an ori instruction, rather than
loading the value -1 into a register & then using an ins instruction.

That is, rather than the following:

  li   t0, -1
  ll   t1, 0(t2)
  ins  t1, t0, 4, 1
  sc   t1, 0(t2)

We can have the simpler:

  ll   t1, 0(t2)
  ori  t1, t1, 0x10
  sc   t1, 0(t2)

The or path already allows immediates to be used, so simply restricting
the ins path to bits that don't fit in immediates is sufficient to take
advantage of this.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: linux-kernel@vger.kernel.org
This commit is contained in:
Paul Burton 2019-10-01 21:53:26 +00:00
parent fe7cd97e68
commit 3d2920cf4f
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1 changed files with 1 additions and 1 deletions
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2
arch/mips/include/asm/bitops.h
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@ -77,7 +77,7 @@ static inline void set_bit(unsigned long nr, volatile unsigned long *addr)
}
#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
if (__builtin_constant_p(bit)) {
if (__builtin_constant_p(bit) && (bit >= 16)) {
loongson_llsc_mb();
do {
__asm__ __volatile__(