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new 4bbb7d9b99 avutil/x86/x86util: Force VEX encoding when using -mavx
4bbb7d9b99 is described below
commit 4bbb7d9b99b58ba6d2a320fe4c0d3c90b0958903
Author: Andreas Rheinhardt <[email protected]>
AuthorDate: Sun Jun 14 00:44:36 2026 +0200
Commit: Andreas Rheinhardt <[email protected]>
CommitDate: Fri Jun 19 20:39:56 2026 +0200
avutil/x86/x86util: Force VEX encoding when using -mavx
This avoids reg-reg moves and saves 90112B of .text here.
It also makes the code less reliant on a clean upper ymm state.
Not all functions use VEX encoding yet; besides inline assembly
functions which are not influenced by x86inc.asm there are also
functions using a mixture of xmm and mmx registers (e.g.
h264_intrapred.asm) using INIT_MMX where the automatic VEX translation
is not active. This means that some parts of the code still rely
on a clean upper ymm state.
Signed-off-by: Andreas Rheinhardt <[email protected]>
---
configure | 4 ++++
libavutil/x86/x86util.asm | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/configure b/configure
index 5149f3c217..db98f049ed 100755
--- a/configure
+++ b/configure
@@ -2445,6 +2445,7 @@ ARCH_FEATURES="
simd_align_16
simd_align_32
simd_align_64
+ x86_sse2avx
"
BUILTIN_LIST="
@@ -6882,6 +6883,7 @@ EOF
enabled avx2 && check_x86asm avx2_external "vextracti128
xmm0, ymm0, 0"
enabled xop && check_x86asm xop_external "vpmacsdd xmm0,
xmm1, xmm2, xmm3"
enabled fma4 && check_x86asm fma4_external "vfmaddps ymm0,
ymm1, ymm2, ymm3"
+ enabled avx && check_x86asm avx_external "vpermilpd ymm0,
ymm1, 0x72"
fi
case "$cpu" in
@@ -6892,6 +6894,8 @@ EOF
check_cc intrinsics_sse2 emmintrin.h "__m128i test = _mm_setzero_si128()"
+ enabled avx_external && test_cpp_condition stddef.h "defined(__AVX__) &&
__AVX__" && enable x86_sse2avx
+
elif enabled loongarch; then
enabled lsx && check_inline_asm lsx '"vadd.b $vr0, $vr1, $vr2"' '-mlsx' &&
append LSXFLAGS '-mlsx'
enabled lasx && check_inline_asm lasx '"xvadd.b $xr0, $xr1, $xr2"'
'-mlasx' && append LASXFLAGS '-mlasx'
diff --git a/libavutil/x86/x86util.asm b/libavutil/x86/x86util.asm
index da41e2e5ef..6632155c99 100644
--- a/libavutil/x86/x86util.asm
+++ b/libavutil/x86/x86util.asm
@@ -27,6 +27,10 @@
%define public_prefix avpriv
%define cpuflags_mmxext cpuflags_mmx2
+%if HAVE_X86_SSE2AVX
+%define FORCE_VEX_ENCODING 1
+%endif
+
%include "libavutil/x86/x86inc.asm"
; expands to [base],...,[base+7*stride]
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