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lavu/tx: make slow ISA extension penalties smarter 

Instead of having a fixed -64 prio penalty, make the penalties
more granular.
As the prio is based on the register size in bits, decrementing
it by 129 makes AVX SLOW functions be avoided in favor of any
SSE versions.
This commit is contained in:
Lynne 2022-05-21 00:04:11 +02:00
parent 19c0bb2aa9
commit 805e8d1921
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GPG Key ID: A2FEA5F03F034464
1 changed files with 13 additions and 2 deletions
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15
libavutil/tx.c
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@ -469,6 +469,15 @@ av_cold int ff_tx_init_subtx(AVTXContext *s, enum AVTXType type,
AV_CPU_FLAG_ATOM | AV_CPU_FLAG_SSSE3SLOW |
AV_CPU_FLAG_AVXSLOW | AV_CPU_FLAG_SLOW_GATHER;
static const int slow_penalties[][2] = {
{ AV_CPU_FLAG_SSE2SLOW, 1 + 64 },
{ AV_CPU_FLAG_SSE3SLOW, 1 + 64 },
{ AV_CPU_FLAG_SSSE3SLOW, 1 + 64 },
{ AV_CPU_FLAG_ATOM, 1 + 128 },
{ AV_CPU_FLAG_AVXSLOW, 1 + 128 },
{ AV_CPU_FLAG_SLOW_GATHER, 1 + 32 },
};
/* Flags the transform wants */
uint64_t req_flags = flags;
@ -535,8 +544,10 @@ av_cold int ff_tx_init_subtx(AVTXContext *s, enum AVTXType type,
/* If the CPU has a SLOW flag, and the instruction is also flagged
* as being slow for such, reduce its priority */
if ((cpu_flags & cd->cpu_flags) & slow_mask)
cd_matches[nb_cd_matches].prio -= 64;
for (int i = 0; i < FF_ARRAY_ELEMS(slow_penalties); i++) {
if ((cpu_flags & cd->cpu_flags) & slow_penalties[i][0])
cd_matches[nb_cd_matches].prio -= slow_penalties[i][1];
}
/* Prioritize aligned-only codelets */
if ((cd->flags & FF_TX_ALIGNED) && !(cd->flags & AV_TX_UNALIGNED))