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MIPS: Use compact branch for LL/SC loops on MIPSr6+

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When targeting MIPSr6 or higher make use of a compact branch in LL/SC
loops, preventing the insertion of a delay slot nop that only serves to
waste space.

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 21:53:06 +00:00
parent 878f75c7a2
commit ef85d057a6
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1 changed files with 4 additions and 0 deletions
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4
arch/mips/include/asm/llsc.h
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@ -9,6 +9,8 @@
#ifndef __ASM_LLSC_H
#define __ASM_LLSC_H
#include <asm/isa-rev.h>
#if _MIPS_SZLONG == 32
#define SZLONG_LOG 5
#define SZLONG_MASK 31UL
@ -32,6 +34,8 @@
*/
#if R10000_LLSC_WAR
# define __SC_BEQZ "beqzl "
#elif MIPS_ISA_REV >= 6
# define __SC_BEQZ "beqzc "
#else
# define __SC_BEQZ "beqz "
#endif