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x86inc: Add REPX macro to repeat instructions/operations 

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:
6d10612ab0

Signed-off-by: Frank Plowman <post@frankplowman.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Henrik Gramner 2023-09-29 11:36:23 +00:00 committed by Anton Khirnov
parent 5a2ca4bf7a
commit ed8ddf0bd3
1 changed files with 10 additions and 0 deletions
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10
libavutil/x86/x86inc.asm
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@ -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 %define gprsize 4
%endif %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 %macro PUSH 1
push %1 push %1
%ifidn rstk, rsp %ifidn rstk, rsp