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target-i386: SSE4.2: use clz32/ctz32 instead of reinventing the wheel 

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2013-03-26 19:56:02 +01:00
parent 83f7dc28ca
commit c334a3880c
2 changed files with 3 additions and 30 deletions
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1
target-i386/fpu_helper.c
View File

@ -20,6 +20,7 @@
#include <math.h>
#include "cpu.h"
#include "helper.h"
#include "qemu/host-utils.h"
#if !defined(CONFIG_USER_ONLY)
#include "exec/softmmu_exec.h"

32
target-i386/ops_sse.h
View File

@ -2064,34 +2064,6 @@ static inline unsigned pcmpxstrx(CPUX86State *env, Reg *d, Reg *s,
return res;
}
static inline int rffs1(unsigned int val)
{
int ret = 1, hi;
for (hi = sizeof(val) * 4; hi; hi /= 2) {
if (val >> hi) {
val >>= hi;
ret += hi;
}
}
return ret;
}
static inline int ffs1(unsigned int val)
{
int ret = 1, hi;
for (hi = sizeof(val) * 4; hi; hi /= 2) {
if (val << hi) {
val <<= hi;
ret += hi;
}
}
return ret;
}
void glue(helper_pcmpestri, SUFFIX)(CPUX86State *env, Reg *d, Reg *s,
uint32_t ctrl)
{
@ -2100,7 +2072,7 @@ void glue(helper_pcmpestri, SUFFIX)(CPUX86State *env, Reg *d, Reg *s,
pcmp_elen(env, R_EAX, ctrl));
if (res) {
env->regs[R_ECX] = (ctrl & (1 << 6)) ? rffs1(res) - 1 : 32 - ffs1(res);
env->regs[R_ECX] = (ctrl & (1 << 6)) ? 31 - clz32(res) : ctz32(res);
} else {
env->regs[R_ECX] = 16 >> (ctrl & (1 << 0));
}
@ -2138,7 +2110,7 @@ void glue(helper_pcmpistri, SUFFIX)(CPUX86State *env, Reg *d, Reg *s,
pcmp_ilen(d, ctrl));
if (res) {
env->regs[R_ECX] = (ctrl & (1 << 6)) ? rffs1(res) - 1 : 32 - ffs1(res);
env->regs[R_ECX] = (ctrl & (1 << 6)) ? 31 - clz32(res) : ctz32(res);
} else {
env->regs[R_ECX] = 16 >> (ctrl & (1 << 0));
}