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cpu: add SLOW_GATHER flag

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Intel Skylake (level 0x16) is the first model with fast gather
opcodes. Mark lower versions with the SLOW_GATHER flag.

Prefer the SSE2 version of the format conversion without gather when
SLOW_GATHER is set. Makes the conversion much faster on my Ivy
Bridge.
This commit is contained in:
Wim Taymans 2026-03-19 16:21:35 +01:00
parent 5ade045654
commit 3b422e31a2
3 changed files with 9 additions and 0 deletions
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1
spa/include/spa/support/cpu.h
View file

@ -62,6 +62,7 @@ struct spa_cpu { struct spa_interface iface; };
#define SPA_CPU_FLAG_BMI2 (1<<18) /**< Bit Manipulation Instruction Set 2 */
#define SPA_CPU_FLAG_AVX512 (1<<19) /**< AVX-512 */
#define SPA_CPU_FLAG_SLOW_UNALIGNED (1<<20) /**< unaligned loads/stores are slow */
#define SPA_CPU_FLAG_SLOW_GATHER (1<<21) /**< gather functions are slow */
/* PPC specific */
#define SPA_CPU_FLAG_ALTIVEC (1<<0) /**< standard */

6
spa/plugins/audioconvert/fmt-ops.c
View file

@ -108,6 +108,9 @@ static struct conv_info conv_table[] =
MAKE(U32, F32, 0, conv_u32_to_f32_c),
MAKE(U32, F32P, 0, conv_u32_to_f32d_c),
#if defined (HAVE_SSE2)
MAKE(S32, F32P, 0, conv_s32_to_f32d_sse2, SPA_CPU_FLAG_SSE2 | SPA_CPU_FLAG_SLOW_GATHER),
#endif
#if defined (HAVE_AVX2)
MAKE(S32, F32P, 0, conv_s32_to_f32d_avx2, SPA_CPU_FLAG_AVX2),
#endif
@ -129,6 +132,9 @@ static struct conv_info conv_table[] =
MAKE(S24, F32, 0, conv_s24_to_f32_c),
MAKE(S24P, F32P, 0, conv_s24d_to_f32d_c),
#if defined (HAVE_SSE2)
MAKE(S24, F32P, 0, conv_s24_to_f32d_sse2, SPA_CPU_FLAG_SSE2 | SPA_CPU_FLAG_SLOW_GATHER),
#endif
#if defined (HAVE_AVX2)
MAKE(S24, F32P, 0, conv_s24_to_f32d_avx2, SPA_CPU_FLAG_AVX2),
#endif

2
spa/plugins/support/cpu-x86.c
View file

@ -78,6 +78,8 @@ x86_init(struct impl *impl)
if ((ebx & AVX512_BITS) == AVX512_BITS)
flags |= SPA_CPU_FLAG_AVX512;
}
if (max_level < 0x16)
flags |= SPA_CPU_FLAG_SLOW_GATHER;
/* Check cpuid level of extended features. */
__cpuid (0x80000000, ext_level, ebx, ecx, edx);