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pan/bi: Don't attempt to fuse AND(ICMP, ICMP) if the AND is swizzled

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There might be cases under which we can make this work but they're
tricky at best.  For now, don't even try.

Cc: mesa-stable
Reviewed-by: Christoph Pillmayer <christoph.pillmayer@arm.com>
(cherry picked from commit 918624174b)

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39828>
This commit is contained in:
Faith Ekstrand 2026-02-05 21:52:09 -05:00 • committed by Marge Bot
parent 4dd76ad0a1
commit e0682b4317
2 changed files with 3 additions and 1 deletions
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2
.pick_status.json
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@ -924,7 +924,7 @@
"description": "pan/bi: Don't attempt to fuse AND(ICMP, ICMP) if the AND is swizzled",
"nominated": true,
"nomination_type": 1,
"resolution": 0,
"resolution": 1,
"main_sha": null,
"because_sha": null,
"notes": null

2
src/panfrost/compiler/bifrost/valhall/va_optimize.c
View file

@ -240,6 +240,8 @@ va_fuse_cmp(bi_context *ctx, bi_instr **lut, const BITSET_WORD *multiple,
/* Ensure we really have a LSHIFT that we can remap (so without shift) */
if (!va_remap_logical_to_logical_cmp(I->op, cmp_type) ||
I->src[0].swizzle != BI_SWIZZLE_H01 ||
I->src[1].swizzle != BI_SWIZZLE_H01 ||
!bi_is_zero(I->src[2]))
return false;