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The following commit(s) were added to refs/heads/master by this push:
new a48e31e501 avcodec/x86/pngdsp.asm: replace MMX with SSE2
a48e31e501 is described below
commit a48e31e501b950babcf7a47498ecf9e4e16cd7de
Author: Zuxy Meng <[email protected]>
AuthorDate: Wed Aug 12 00:18:34 2026 -0700
Commit: Zuxy Meng <[email protected]>
CommitDate: Sun Aug 16 16:10:09 2026 -0700
avcodec/x86/pngdsp.asm: replace MMX with SSE2
No more use of mm registers and emms. Performance identical.
Signed-off-by: Zuxy Meng <[email protected]>
---
libavcodec/x86/pngdsp.asm | 21 ++++++++++-----------
1 file changed, 10 insertions(+), 11 deletions(-)
diff --git a/libavcodec/x86/pngdsp.asm b/libavcodec/x86/pngdsp.asm
index e0a3b602de..c7dc27ad42 100644
--- a/libavcodec/x86/pngdsp.asm
+++ b/libavcodec/x86/pngdsp.asm
@@ -76,13 +76,13 @@ cglobal add_bytes_l2, 4, 6, 2, dst, src1, src2, wa, w, i
jl .loop_s
RET
-INIT_MMX ssse3
-cglobal png_add_paeth_prediction, 5, 7, 0, dst, src, top, w, bpp, end, cntr
+INIT_XMM ssse3
+cglobal png_add_paeth_prediction, 5, 7, 8, dst, src, top, w, bpp, end, cntr
%if ARCH_X86_64
movsxd bppq, bppd
movsxd wq, wd
%endif
- lea endq, [dstq+wq-(mmsize/2-1)]
+ lea endq, [dstq+wq-(mmsize/4-1)]
sub topq, dstq
sub srcq, dstq
sub dstq, bppq
@@ -90,17 +90,17 @@ cglobal png_add_paeth_prediction, 5, 7, 0, dst, src, top,
w, bpp, end, cntr
PUSH dstq
lea cntrq, [bppq-1]
- shr cntrq, 2 + mmsize/16
+ shr cntrq, 2 + mmsize/32
.bpp_loop:
- lea dstq, [dstq+cntrq*(mmsize/2)]
- movh m0, [dstq]
- movh m1, [topq+dstq]
+ lea dstq, [dstq+cntrq*(mmsize/4)]
+ movd m0, [dstq]
+ movd m1, [topq+dstq]
punpcklbw m0, m7
punpcklbw m1, m7
add dstq, bppq
.loop:
mova m2, m1
- movh m1, [topq+dstq]
+ movd m1, [topq+dstq]
mova m3, m2
punpcklbw m1, m7
mova m4, m2
@@ -119,7 +119,7 @@ cglobal png_add_paeth_prediction, 5, 7, 0, dst, src, top,
w, bpp, end, cntr
pand m4, m3
pandn m6, m3
pandn m3, m0
- movh m0, [srcq+dstq]
+ movd m0, [srcq+dstq]
pand m6, m1
pand m2, m4
punpcklbw m0, m7
@@ -129,7 +129,7 @@ cglobal png_add_paeth_prediction, 5, 7, 0, dst, src, top,
w, bpp, end, cntr
pand m0, [pw_255]
mova m3, m0
packuswb m3, m3
- movh [dstq], m3
+ movd [dstq], m3
add dstq, bppq
cmp dstq, endq
jl .loop
@@ -138,5 +138,4 @@ cglobal png_add_paeth_prediction, 5, 7, 0, dst, src, top,
w, bpp, end, cntr
dec cntrq
jge .bpp_loop
POP dstq
- emms
RET
--
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