[FFmpeg-devel] [PATCH] x86inc: Add REPX macro to repeat instructions/operations

[Frank Plowman]

From: Henrik Gramner <henrik at gramner.com>

When operating on large blocks of data it's common to repeatedly use
an instruction on multiple registers. Using the REPX macro makes it
easy to quickly write dense code to achieve this without having to
explicitly duplicate the same instruction over and over.

For example,

    REPX {paddw x, m4}, m0, m1, m2, m3
    REPX {mova [r0+16*x], m5}, 0, 1, 2, 3

will expand to

    paddw       m0, m4
    paddw       m1, m4
    paddw       m2, m4
    paddw       m3, m4
    mova [r0+16*0], m5
    mova [r0+16*1], m5
    mova [r0+16*2], m5
    mova [r0+16*3], m5

Commit taken from x264:
https://code.videolan.org/videolan/x264/-/commit/6d10612ab0007f8f60dd2399182efd696da3ffe4

Signed-off-by: Frank Plowman <post at frankplowman.com>
---
 libavutil/x86/x86inc.asm | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/libavutil/x86/x86inc.asm b/libavutil/x86/x86inc.asm
index 251ee797de..e099ee4b10 100644
--- a/libavutil/x86/x86inc.asm
+++ b/libavutil/x86/x86inc.asm
@@ -232,6 +232,16 @@ DECLARE_REG_TMP_SIZE 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14
     %define gprsize 4
 %endif
 
+; Repeats an instruction/operation for multiple arguments.
+; Example usage: "REPX {psrlw x, 8}, m0, m1, m2, m3"
+%macro REPX 2-* ; operation, args
+    %xdefine %%f(x) %1
+    %rep %0 - 1
+        %rotate 1
+        %%f(%1)
+    %endrep
+%endmacro
+
 %macro PUSH 1
     push %1
     %ifidn rstk, rsp
-- 
2.41.0