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MIPS: Add MIPS32R2 compile-time/runtime CPU detection.

master
Mike Pall 2012-03-30 01:34:17 +02:00
parent aaaf0e0f5f
commit 2225c9aafc
2 changed files with 21 additions and 1 deletions
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16
src/lib_jit.c
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@ -615,7 +615,21 @@ static uint32_t jit_cpudetect(lua_State *L)
#elif LJ_TARGET_PPC || LJ_TARGET_PPCSPE
/* Nothing to do. */
#elif LJ_TARGET_MIPS
/* NYI */
#if LJ_HASJIT
/* Compile-time MIPS CPU detection. */
#if _MIPS_ARCH_MIPS32R2
flags |= JIT_F_MIPS32R2;
#endif
/* Runtime MIPS CPU detection. */
#if defined(__GNUC__)
if (!(flags & JIT_F_MIPS32R2)) {
int x;
/* On MIPS32R1 rotr is treated as srl. rotr r2,r2,1 -> srl r2,r2,1. */
__asm__("li $2, 1\n\t.long 0x00221042\n\tmove %0, $2" : "=r"(x) : : "$2");
if (x) flags |= JIT_F_MIPS32R2; /* Either 0x80000000 (R2) or 0 (R1). */
}
#endif
#endif
#else
#error "Missing CPU detection for this architecture"
#endif

6
src/lj_jit.h
View File

@ -34,6 +34,12 @@
/* Names for the CPU-specific flags. Must match the order above. */
#define JIT_F_CPU_FIRST JIT_F_ARMV6
#define JIT_F_CPUSTRING "\5ARMv6\7ARMv6T2\5ARMv7"
#elif LJ_TARGET_MIPS
#define JIT_F_MIPS32R2 0x00000010
/* Names for the CPU-specific flags. Must match the order above. */
#define JIT_F_CPU_FIRST JIT_F_MIPS32R2
#define JIT_F_CPUSTRING "\010MIPS32R2"
#else
#define JIT_F_CPU_FIRST 0
#define JIT_F_CPUSTRING ""