2bdffe7eb2
When there are multiple MOVs with the same destination in loop
in different branches and some readers after the loop, we would
now errorneously copy propagate the last MOV, like in the following
snippet:
BGNLOOP;
...
IF temp[3].x___;
MOV temp[2], const[1].yxxy;
BRK;
ENDIF;
IF temp[4].x___;
MOV temp[2], const[1].xyxy;
BRK;
ENDIF;
...
MOV temp[2], const[1].xyxy;
ENDLOOP;
ADD_SAT temp[0], temp[2], temp[1];
into:
BGNLOOP;
...
IF temp[3].x___;
MOV temp[2], const[1].yxxy;
BRK;
ENDIF;
IF temp[3].y___;
MOV temp[2], const[1].xyxy;
BRK;
ENDIF;
...
ENDLOOP;
ADD_SAT temp[0], const[1].xyxy, temp[1];
We need the copy propagate just for simple cleanups after ttn,
anything more complex should have been handled already in NIR.
So just bail out if any of the readers is after the loop.
No changes in shader-db.
Fixes few piglit tests when loop unrolling is disabled:
spec@glsl-1.10@execution@vs-loop-complex-unroll
spec@glsl-1.10@execution@vs-loop-complex-unroll-nested-break
spec@glsl-1.10@execution@vs-loop-complex-unroll-with-else-break
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/6467
Signed-off-by: Pavel Ondračka <pavel.ondracka@gmail.com>
Reviewed-by: Filip Gawin <filip@gawin.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16657>
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