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pan/bi: Allow CSE of preloaded registers

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Needed to CSE `LEA_VARY` in varying shaders on Valhall.

No shader-db changes on Bifrost.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15204>
This commit is contained in:
Alyssa Rosenzweig 2021-12-12 16:45:16 -05:00 • committed by Marge Bot
parent 3154df232b
commit 600f689a98
1 changed files with 5 additions and 2 deletions
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7
src/panfrost/bifrost/bi_opt_cse.c
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@ -139,9 +139,12 @@ instr_can_cse(const bi_instr *I)
return false;
}
/* Similar refuse to CSE non-SSA sources */
/* Similar refuse to CSE non-SSA sources. We allow machine registers,
* since CSE runs before register allocation which means any registers
* encountered are preloaded and hence assumed constant.
*/
bi_foreach_src(I, s) {
if (I->src[s].reg || I->src[s].type == BI_INDEX_REGISTER)
if (I->src[s].reg)
return false;
}