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This commit is contained in:
Andrea Mazzoleni 2026-04-27 15:44:41 +02:00
parent 9af3d720cb
commit 3fd2bb114a
7 changed files with 81 additions and 47 deletions
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14
raid/cpu.h
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@ -28,9 +28,11 @@ static inline void raid_xgetbv(uint32_t* reg)
{
/* get the value of the Extended Control Register ecx=0 */
asm volatile (
/* uses a direct encoding of the XGETBV instruction as only recent */
/* assemblers support it. */
/* the next line is equivalent to: "xgetbv\n" */
/*
* Uses a direct encoding of the XGETBV instruction as only recent
* assemblers support it.
* the next line is equivalent to: "xgetbv\n"
*/
".byte 0x0f, 0x01, 0xd0\n"
: "=a" (reg[0]), "=d" (reg[3])
: "c" (0)
@ -213,8 +215,10 @@ static inline int raid_cpu_has_avx512bw(void)
* 3) Verify both CPUID.0x7.0:EBX.AVX512F[bit 16] = 1, CPUID.0x7.0:EBX.AVX512BW[bit 30] = 1.
*/
/* note that intentionally we don't check for AVX and AVX2 */
/* because the documentation doesn't require that */
/*
* Note that intentionally we don't check for AVX and AVX2
* because the documentation doesn't require that
*/
return raid_cpu_match_avx(
1 << 27, /* Leaf 1, ECX: XSAVE/XGETBV */
(1 << 16) | (1 << 30), /* Leaf 7, EBX: AVX512F and AVX512BW */