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cpuinfo/i386: Detect GFNI as an AVX extension

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We won't use the SSE GFNI instructions, so delay
detection until we know AVX is present.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson
2025-08-05 11:40:31 +10:00
parent 27ea28a0b3
commit b8eb3dd495
3 changed files with 5 additions and 0 deletions
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1
host/include/i386/host/cpuinfo.h
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@@ -27,6 +27,7 @@
#define CPUINFO_ATOMIC_VMOVDQU (1u << 17)
#define CPUINFO_AES (1u << 18)
#define CPUINFO_PCLMUL (1u << 19)
#define CPUINFO_GFNI (1u << 20)
/* Initialized with a constructor. */
extern unsigned cpuinfo;

3
include/qemu/cpuid.h
View File

@@ -68,6 +68,9 @@
#ifndef bit_AVX512VBMI2
#define bit_AVX512VBMI2 (1 << 6)
#endif
#ifndef bit_GFNI
#define bit_GFNI (1 << 8)
#endif
/* Leaf 0x80000001, %ecx */
#ifndef bit_LZCNT

1
util/cpuinfo-i386.c
View File

@@ -50,6 +50,7 @@ unsigned __attribute__((constructor)) cpuinfo_init(void)
if ((bv & 6) == 6) {
info |= CPUINFO_AVX1;
info |= (b7 & bit_AVX2 ? CPUINFO_AVX2 : 0);
info |= (c7 & bit_GFNI ? CPUINFO_GFNI : 0);
if ((bv & 0xe0) == 0xe0) {
info |= (b7 & bit_AVX512F ? CPUINFO_AVX512F : 0);