[FFmpeg-devel] [PATCH 3/3] swscale/x86/yuv2yuvX: Process tails by jumping back into the main loop.

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

---
 libswscale/x86/swscale.c    | 11 ++++-------
 libswscale/x86/yuv2yuvX.asm | 24 ++++++++++++++++++------
 2 files changed, 22 insertions(+), 13 deletions(-)

diff --git a/libswscale/x86/swscale.c b/libswscale/x86/swscale.c
index 600c7d6c91..6980002e9e 100644
--- a/libswscale/x86/swscale.c
+++ b/libswscale/x86/swscale.c
@@ -202,17 +202,14 @@ static void yuv2yuvX_ ##opt(const int16_t *filter, int filterSize, \
                            const int16_t **src, uint8_t *dest, int dstW, \
                            const uint8_t *dither, int offset) \
 { \
-    int remainder = (dstW % step); \
-    int pixelsProcessed = dstW - remainder; \
     if(((uintptr_t)dest) & 15){ \
         yuv2yuvX_mmxext(filter, filterSize, src, dest, dstW, dither, offset); \
         return; \
     } \
-    if(pixelsProcessed > 0) \
-        ff_yuv2yuvX_ ##opt(filter, filterSize - 1, 0, dest - offset, pixelsProcessed + offset, dither, offset); \
-    if(remainder > 0){ \
-      yuv2yuvX_ ##tail(filter, filterSize, src, dest, dstW, dither, offset); \
-    } \
+    if (dstW >= step) \
+        ff_yuv2yuvX_ ##opt(filter, filterSize - 1, 0, dest - offset, dstW + offset, dither, offset); \
+    else \
+        yuv2yuvX_ ##tail(filter, filterSize, src, dest, dstW, dither, offset); \
     return; \
 }
 
diff --git a/libswscale/x86/yuv2yuvX.asm b/libswscale/x86/yuv2yuvX.asm
index 57bfa09d66..03bfd6ad1d 100644
--- a/libswscale/x86/yuv2yuvX.asm
+++ b/libswscale/x86/yuv2yuvX.asm
@@ -54,6 +54,8 @@ cglobal yuv2yuvX, 7, 7, 8, filter, filterSize, src, dest, dstW, dither, offset
 %else
     movq                 xm3, [ditherq]
 %endif ; avx2
+    mov                  ditherq, dstWq
+    sub                  dstWq, mmsize * unroll
 
 %if cpuflag(avx512)
     mova                 m15, [permutation]
@@ -92,13 +94,17 @@ cglobal yuv2yuvX, 7, 7, 8, filter, filterSize, src, dest, dstW, dither, offset
 %else
     mova                 m0, [filterSizeq + 8]
 %endif
-    pmulhw               m2, m0, [srcq + offsetq * 2]
-    pmulhw               m5, m0, [srcq + offsetq * 2 + mmsize]
+    movu                 m2, [srcq + offsetq * 2]
+    movu                 m5, [srcq + offsetq * 2 + mmsize]
+    pmulhw               m2, m0, m2
+    pmulhw               m5, m0, m5
     paddw                m3, m3, m2
     paddw                m4, m4, m5
 %if cpuflag(sse3)
-    pmulhw               m2, m0, [srcq + offsetq * 2 + 2 * mmsize]
-    pmulhw               m5, m0, [srcq + offsetq * 2 + 3 * mmsize]
+    movu                 m2, [srcq + offsetq * 2 + 2 * mmsize]
+    movu                 m5, [srcq + offsetq * 2 + 3 * mmsize]
+    pmulhw               m2, m0, m2
+    pmulhw               m5, m0, m5
     paddw                m6, m6, m2
     paddw                m1, m1, m5
 %endif
@@ -131,8 +137,14 @@ cglobal yuv2yuvX, 7, 7, 8, filter, filterSize, src, dest, dstW, dither, offset
     add                  offsetq, mmsize * unroll
     mov                  filterSizeq, filterq
     cmp                  offsetq, dstWq
-    jb                  .outerloop
-    RET
+    jb                   .outerloop
+
+    mov                  dstWq, offsetq
+    mov                  offsetq, ditherq
+    sub                  offsetq, mmsize * unroll
+    cmp                  dstWq, ditherq
+    jb                   .outerloop
+    REP_RET
 %endmacro
 
 INIT_MMX mmxext
-- 
2.41.0.255.g8b1d071c50-goog

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