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r300: don't merge w channel in fragment shaders

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Skip the merge if one of the instructions writes just w channel
and we are compiling a fragment shader. We can pair-schedule it together
later anyway and it will also give the scheduler a bit more flexibility.

Shader-db stats with RV530:
total instructions in shared programs: 169522 -> 169509 (<.01%)
instructions in affected programs: 14170 -> 14157 (-0.09%)
total temps in shared programs: 21712 -> 21722 (0.05%)
temps in affected programs: 324 -> 334 (3.09%)

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/17560>
This commit is contained in:
Pavel Ondračka 2022-07-12 16:03:35 +02:00
parent 268f317f22
commit 13607d8c48
1 changed files with 8 additions and 0 deletions
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8
src/gallium/drivers/r300/compiler/radeon_optimize.c
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@ -1030,6 +1030,14 @@ static void merge_channels(struct radeon_compiler * c, struct rc_instruction * i
cur->U.I.SaturateMode == inst->U.I.SaturateMode &&
(cur->U.I.DstReg.WriteMask & orig_dst_wmask) == 0) {
/* Skip the merge if one of the instructions writes just w channel
* and we are compiling a fragment shader. We can pair-schedule it together
* later anyway and it will also give the scheduler a bit more flexibility.
*/
if (c->has_omod && (cur->U.I.DstReg.WriteMask == RC_MASK_W ||
inst->U.I.DstReg.WriteMask == RC_MASK_W))
continue;
if (inst_combination(cur, inst, RC_OPCODE_MOV, RC_OPCODE_MOV)) {
if (merge_movs(c, inst, cur))
return;