[FFmpeg-devel] [PATCH 2/4] libswscale: Avx2 hscale can process any input of size which is a multiple of 4.

[Alan Kelly <alankelly-at-google.com@ffmpeg.org>]

The main loop processes blocks of 16 pixels. The tail processes blocks
of size 4.
---
 libswscale/x86/scale_avx2.asm | 48 +++++++++++++++++++++++++++++++++--
 1 file changed, 46 insertions(+), 2 deletions(-)

diff --git a/libswscale/x86/scale_avx2.asm b/libswscale/x86/scale_avx2.asm
index 20acdbd633..dc42abb100 100644
--- a/libswscale/x86/scale_avx2.asm
+++ b/libswscale/x86/scale_avx2.asm
@@ -53,6 +53,9 @@ cglobal hscale8to15_%1, 7, 9, 16, pos0, dst, w, srcmem, filter, fltpos, fltsize,
     mova m14, [four]
     shr fltsized, 2
 %endif
+    cmp wq, 16
+    jl .tail_loop
+    mov countq, 0x10
 .loop:
     movu m1, [fltposq]
     movu m2, [fltposq+32]
@@ -97,11 +100,52 @@ cglobal hscale8to15_%1, 7, 9, 16, pos0, dst, w, srcmem, filter, fltpos, fltsize,
     vpsrad  m6, 7
     vpackssdw m5, m5, m6
     vpermd m5, m15, m5
-    vmovdqu [dstq + countq * 2], m5
+    vmovdqu [dstq], m5
+    add dstq, 0x20
     add fltposq, 0x40
     add countq, 0x10
     cmp countq, wq
-    jl .loop
+    jle .loop
+
+    sub countq, 0x10
+    cmp countq, wq
+    jge .end
+
+.tail_loop:
+    movu xm1, [fltposq]
+%ifidn %1, X4
+    pxor xm9, xm9
+    pxor xm10, xm10
+    xor innerq, innerq
+.tail_innerloop:
+%endif
+    vpcmpeqd  xm13, xm13
+    vpgatherdd xm3,[srcmemq + xm1], xm13
+    vpunpcklbw xm5, xm3, xm0
+    vpunpckhbw xm6, xm3, xm0
+    vpmaddwd xm5, xm5, [filterq]
+    vpmaddwd xm6, xm6, [filterq + 16]
+    add filterq, 0x20
+%ifidn %1, X4
+    paddd xm9, xm5
+    paddd xm10, xm6
+    paddd xm1, xm14
+    add innerq, 1
+    cmp innerq, fltsizeq
+    jl .tail_innerloop
+    vphaddd xm5, xm9, xm10
+%else
+    vphaddd xm5, xm5, xm6
+%endif
+    vpsrad  xm5, 7
+    vpackssdw xm5, xm5, xm5
+    vmovq [dstq], xm5
+    add dstq, 0x8
+    add fltposq, 0x10
+    add countq, 0x4
+    cmp countq, wq
+    jl .tail_loop
+.end:
 REP_RET
 %endmacro
 
-- 
2.34.1.575.g55b058a8bb-goog

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