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host/i386: assume presence of SSE2

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QEMU now requires an x86-64-v2 host, which has SSE2.
Use it freely in buffer_is_zero.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-05-31 11:02:46 +02:00
parent e68e97ce55
commit b18236897c
3 changed files with 2 additions and 4 deletions
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1
host/include/i386/host/cpuinfo.h
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@ -14,7 +14,6 @@
#define CPUINFO_POPCNT (1u << 4) #define CPUINFO_POPCNT (1u << 4)
#define CPUINFO_BMI1 (1u << 5) #define CPUINFO_BMI1 (1u << 5)
#define CPUINFO_BMI2 (1u << 6) #define CPUINFO_BMI2 (1u << 6)
#define CPUINFO_SSE2 (1u << 7)
#define CPUINFO_AVX1 (1u << 9) #define CPUINFO_AVX1 (1u << 9)
#define CPUINFO_AVX2 (1u << 10) #define CPUINFO_AVX2 (1u << 10)
#define CPUINFO_AVX512F (1u << 11) #define CPUINFO_AVX512F (1u << 11)

4
util/bufferiszero.c
View file

@ -188,14 +188,14 @@ static biz_accel_fn const accel_table[] = {
static unsigned best_accel(void) static unsigned best_accel(void)
{ {
#ifdef CONFIG_AVX2_OPT
unsigned info = cpuinfo_init(); unsigned info = cpuinfo_init();
#ifdef CONFIG_AVX2_OPT
if (info & CPUINFO_AVX2) { if (info & CPUINFO_AVX2) {
return 2; return 2;
} }
#endif #endif
return info & CPUINFO_SSE2 ? 1 : 0; return 1;
} }
#elif defined(__aarch64__) && defined(__ARM_NEON) #elif defined(__aarch64__) && defined(__ARM_NEON)

1
util/cpuinfo-i386.c
View file

@ -34,7 +34,6 @@ unsigned __attribute__((constructor)) cpuinfo_init(void)
if (max >= 1) { if (max >= 1) {
__cpuid(1, a, b, c, d); __cpuid(1, a, b, c, d);
info |= (d & bit_SSE2 ? CPUINFO_SSE2 : 0);
info |= (c & bit_MOVBE ? CPUINFO_MOVBE : 0); info |= (c & bit_MOVBE ? CPUINFO_MOVBE : 0);
info |= (c & bit_POPCNT ? CPUINFO_POPCNT : 0); info |= (c & bit_POPCNT ? CPUINFO_POPCNT : 0);
info |= (c & bit_PCLMUL ? CPUINFO_PCLMUL : 0); info |= (c & bit_PCLMUL ? CPUINFO_PCLMUL : 0);