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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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spa/include/spa/support/cpu.h
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@ -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 */