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Code Issues Releases Activity

lavu/x86/tx_float: fix FMA3 implying AVX2 is available

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It's the other way around - AVX2 implies FMA3 is available.
This commit is contained in:
Lynne 2021-04-24 18:45:02 +02:00
parent a5f996de4f
commit e448a4b4ea
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2 changed files with 10 additions and 5 deletions
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4
libavutil/x86/tx_float.asm
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@ -100,7 +100,7 @@ SECTION .text
; %6 - temporary register (for avx only)
; %7 - temporary register (for avx only, enables vgatherdpd (AVX2) if FMA3 is set)
%macro LOAD64_LUT 5-7
%if %0 > 6 && cpuflag(fma3)
%if %0 > 6 && cpuflag(avx2)
pcmpeqd %6, %6 ; pcmpeqq has a 0.5 throughput on Zen 3, this has 0.25
movapd xmm%7, [%3 + %4] ; float mov since vgatherdpd is a float instruction
vgatherdpd %1, [%2 + xmm%7*8], %6 ; must use separate registers for args
@ -1208,5 +1208,5 @@ FFT_SPLIT_RADIX_DEF 131072
%if ARCH_X86_64
FFT_SPLIT_RADIX_FN avx
FFT_SPLIT_RADIX_FN fma3
FFT_SPLIT_RADIX_FN avx2
%endif

11
libavutil/x86/tx_float_init.c
View File

@ -32,7 +32,7 @@ void ff_fft32_float_avx (AVTXContext *s, void *out, void *in, ptrdiff_t stri
void ff_fft32_float_fma3 (AVTXContext *s, void *out, void *in, ptrdiff_t stride);
void ff_split_radix_fft_float_avx (AVTXContext *s, void *out, void *in, ptrdiff_t stride);
void ff_split_radix_fft_float_fma3(AVTXContext *s, void *out, void *in, ptrdiff_t stride);
void ff_split_radix_fft_float_avx2(AVTXContext *s, void *out, void *in, ptrdiff_t stride);
av_cold void ff_tx_init_float_x86(AVTXContext *s, av_tx_fn *tx)
{
@ -87,10 +87,15 @@ av_cold void ff_tx_init_float_x86(AVTXContext *s, av_tx_fn *tx)
#if ARCH_X86_64
else if (s->m == 32)
TXFN(ff_fft32_float_fma3, 1, 8, 2);
else if (s->m >= 64 && s->m <= 131072 && !(s->flags & AV_TX_INPLACE))
TXFN(ff_split_radix_fft_float_fma3, 1, 8, 2);
#endif
}
#if ARCH_X86_64
if (EXTERNAL_AVX2_FAST(cpu_flags)) {
if (s->m >= 64 && s->m <= 131072 && !(s->flags & AV_TX_INPLACE))
TXFN(ff_split_radix_fft_float_avx2, 1, 8, 2);
}
#endif
}
if (gen_revtab)