On 6/8/2024 12:55 PM, Andreas Rheinhardt wrote:
James Almer:
On 6/6/2024 11:48 AM, Andreas Rheinhardt wrote:
James Almer:
And remove shuffle_bytes_2103_mmxext.

shuffle_bytes_0321_c: 28.1
shuffle_bytes_0321_sse2: 13.6
shuffle_bytes_0321_ssse3: 9.6
shuffle_bytes_0321_avx2: 7.1
shuffle_bytes_1230_c: 52.6
shuffle_bytes_1230_sse2: 12.1
shuffle_bytes_1230_ssse3: 8.6
shuffle_bytes_1230_avx2: 6.6
shuffle_bytes_2103_c: 29.1
shuffle_bytes_2103_mmxext: 29.3 // removed
shuffle_bytes_2103_sse2: 12.5
shuffle_bytes_2103_ssse3: 8.6
shuffle_bytes_2103_avx2: 7.1
shuffle_bytes_3012_c: 52.1
shuffle_bytes_3012_sse2: 12.1
shuffle_bytes_3012_ssse3: 8.6
shuffle_bytes_3012_avx2: 7.1
shuffle_bytes_3210_c: 50.6
shuffle_bytes_3210_sse2: 14.6
shuffle_bytes_3210_ssse3: 8.6
shuffle_bytes_3210_avx2: 7.1

Signed-off-by: James Almer <jamr...@gmail.com>
---
   libswscale/x86/rgb2rgb.c     | 14 ++++--
   libswscale/x86/rgb_2_rgb.asm | 83 +++++++++++++++++++++++++-----------
   2 files changed, 69 insertions(+), 28 deletions(-)

diff --git a/libswscale/x86/rgb2rgb.c b/libswscale/x86/rgb2rgb.c
index 21ccfafe51..9f6c8efc72 100644
--- a/libswscale/x86/rgb2rgb.c
+++ b/libswscale/x86/rgb2rgb.c
@@ -116,7 +116,11 @@ DECLARE_ALIGNED(8, extern const uint64_t,
ff_bgr2UVOffset);
     #endif /* HAVE_INLINE_ASM */
   -void ff_shuffle_bytes_2103_mmxext(const uint8_t *src, uint8_t
*dst, int src_size);
+void ff_shuffle_bytes_2103_sse2(const uint8_t *src, uint8_t *dst,
int src_size);
+void ff_shuffle_bytes_0321_sse2(const uint8_t *src, uint8_t *dst,
int src_size);
+void ff_shuffle_bytes_1230_sse2(const uint8_t *src, uint8_t *dst,
int src_size);
+void ff_shuffle_bytes_3012_sse2(const uint8_t *src, uint8_t *dst,
int src_size);
+void ff_shuffle_bytes_3210_sse2(const uint8_t *src, uint8_t *dst,
int src_size);
   void ff_shuffle_bytes_2103_ssse3(const uint8_t *src, uint8_t *dst,
int src_size);
   void ff_shuffle_bytes_0321_ssse3(const uint8_t *src, uint8_t *dst,
int src_size);
   void ff_shuffle_bytes_1230_ssse3(const uint8_t *src, uint8_t *dst,
int src_size);
@@ -154,10 +158,12 @@ av_cold void rgb2rgb_init_x86(void)
           rgb2rgb_init_avx();
   #endif /* HAVE_INLINE_ASM */
   -    if (EXTERNAL_MMXEXT(cpu_flags)) {
-        shuffle_bytes_2103 = ff_shuffle_bytes_2103_mmxext;
-    }
       if (EXTERNAL_SSE2(cpu_flags)) {
+        shuffle_bytes_2103 = ff_shuffle_bytes_2103_sse2;
+        shuffle_bytes_0321 = ff_shuffle_bytes_0321_sse2;
+        shuffle_bytes_1230 = ff_shuffle_bytes_1230_sse2;
+        shuffle_bytes_3012 = ff_shuffle_bytes_3012_sse2;
+        shuffle_bytes_3210 = ff_shuffle_bytes_3210_sse2;
   #if ARCH_X86_64
           uyvytoyuv422 = ff_uyvytoyuv422_sse2;
   #endif
diff --git a/libswscale/x86/rgb_2_rgb.asm b/libswscale/x86/rgb_2_rgb.asm
index 0bf1278718..9fc1974389 100644
--- a/libswscale/x86/rgb_2_rgb.asm
+++ b/libswscale/x86/rgb_2_rgb.asm
@@ -25,7 +25,6 @@
     SECTION_RODATA
   -pb_mask_shuffle2103_mmx times 8 dw 255
   pb_shuffle2103: db 2, 1, 0, 3, 6, 5, 4, 7, 10, 9, 8, 11, 14, 13,
12, 15
   pb_shuffle0321: db 0, 3, 2, 1, 4, 7, 6, 5, 8, 11, 10, 9, 12, 15,
14, 13
   pb_shuffle1230: db 1, 2, 3, 0, 5, 6, 7, 4, 9, 10, 11, 8, 13, 14,
15, 12
@@ -50,11 +49,50 @@ SECTION .text
;------------------------------------------------------------------------------
   ; shuffle_bytes_2103_mmext (const uint8_t *src, uint8_t *dst, int
src_size)
;------------------------------------------------------------------------------
-INIT_MMX mmxext
-cglobal shuffle_bytes_2103, 3, 5, 8, src, dst, w, tmp, x
-    mova   m6, [pb_mask_shuffle2103_mmx]
-    mova   m7, m6
-    psllq  m7, 8
+
+%macro SHUFFLE2103_SSE2 0
+    pshuflw   m1, m0, 0xb1
+    pshufhw   m1, m1, 0xb1
+
+    pand     m0, m3
+    pand     m1, m2
+%endmacro
+
+%macro SHUFFLE0321_SSE2 0
+    pshuflw   m1, m0, 0xb1
+    pshufhw   m1, m1, 0xb1
+
+    pand     m0, m2
+    pand     m1, m3
+%endmacro
+
+%macro SHUFFLE1230_SSE2 0
+    pslld    m1, m0, 24
+    psrld    m0, 8
+%endmacro
+
+%macro SHUFFLE3012_SSE2 0
+    pslld    m1, m0, 8
+    psrld    m0, 24
+%endmacro
+
+%macro SHUFFLE3210_SSE2 0
+    pshuflw   m1, m0, 0xb1
+    pshufhw   m1, m1, 0xb1
+
+    psrlw     m0, m1, 8
+    psllw     m1, 8
+%endmacro
+
+; %1-4 index shuffle
+; %5 load mask
+%macro SHUFFLE_BYTES_SSE2 5
+cglobal shuffle_bytes_%1%2%3%4, 3, 5, 4, src, dst, w, tmp, x
+%if %5
+    pcmpeqw        m2, m2
+    psllw          m3, m2, 8 ; (word) { 0xff00 } x4
+    psrlw          m2, 8     ; (word) { 0x00ff } x4
+%endif
         movsxdifnidn wq, wd
       mov xq, wq
@@ -68,13 +106,13 @@ cglobal shuffle_bytes_2103, 3, 5, 8, src, dst,
w, tmp, x
       je .loop_simd
     .loop_scalar:
-   mov          tmpb, [srcq + wq + 2]
+   mov          tmpb, [srcq + wq + %1]
      mov [dstq+wq + 0], tmpb
-   mov          tmpb, [srcq + wq + 1]
+   mov          tmpb, [srcq + wq + %2]
      mov [dstq+wq + 1], tmpb
-   mov          tmpb, [srcq + wq + 0]
+   mov          tmpb, [srcq + wq + %3]
      mov [dstq+wq + 2], tmpb
-   mov          tmpb, [srcq + wq + 3]
+   mov          tmpb, [srcq + wq + %4]
      mov [dstq+wq + 3], tmpb
      add            wq, 4
      sub            xq, 4
@@ -86,29 +124,26 @@ jge .end
     .loop_simd:
       movu     m0, [srcq+wq]
-    movu     m1, [srcq+wq+8]
-
-    pshufw   m3, m0, 177
-    pshufw   m5, m1, 177
-
-    pand     m0, m7
-    pand     m3, m6
   -    pand     m1, m7
-    pand     m5, m6
+    SHUFFLE%1%2%3%4_SSE2
   -    por      m0, m3
-    por      m1, m5
+    por      m0, m1
         movu      [dstq+wq], m0
-    movu  [dstq+wq + 8], m1
   -    add              wq, mmsize*2
+    add              wq, mmsize
       jl .loop_simd
     .end:
-    emms
       RET
+%endmacro
+
+INIT_XMM sse2
+SHUFFLE_BYTES_SSE2 2, 1, 0, 3, 1
+SHUFFLE_BYTES_SSE2 0, 3, 2, 1, 1
+SHUFFLE_BYTES_SSE2 1, 2, 3, 0, 0
+SHUFFLE_BYTES_SSE2 3, 0, 1, 2, 0
+SHUFFLE_BYTES_SSE2 3, 2, 1, 0, 0
;------------------------------------------------------------------------------
   ; shuffle_bytes_## (const uint8_t *src, uint8_t *dst, int src_size)

How old are the youngest processors with SSE2, but without SSSE3?

AMD Phenom/K10.

According to Wikipedia, nearly 15 years. Which makes me believe that the
SSE2 versions are not worth it (how many of these CPUs will use a new
FFmpeg anyway?).

Simply by using the latest version of a video player that uses ffmpeg is
enough to be able to run the newest code.

I asked "how many", not "how".

I obviously don't have that kind of information. You'd need to look at things like Steam's, Firefox's or Chrome's hardware surveys.


It was easy to write and i don't feel particularly interested enough to
argue, so if you think it's not worth adding, i can just remove the
mmxext version and skip adding anything.

I think we should not optimize for CPUs that do not even have x86-64 v2.

What is x86-64 v2?

So I would not add these SSE2 versions. But the one missing SSSE3

Ok, I'll just remove the mmxext one, then.

version (shuffle_bytes_2103_ssse3) is of course worth it.

I will look into that.


- Andreas

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