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aco: workaround GFX9 hardware bug for D16 image instructions

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Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13592>
This commit is contained in:
Daniel Schürmann 2021-11-05 14:24:12 +01:00 • committed by Marge Bot
parent 8f1483cd5c
commit 626aa7b648
1 changed files with 14 additions and 0 deletions
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14
src/amd/compiler/aco_register_allocation.cpp
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@ -220,6 +220,20 @@ struct DefInfo {
stride = DIV_ROUND_UP(stride, 4);
}
assert(stride > 0);
} else if (instr->isMIMG() && instr->mimg().d16 && ctx.program->chip_class <= GFX9) {
/* Workaround GFX9 hardware bug for D16 image instructions: FeatureImageGather4D16Bug
*
* The register use is not calculated correctly, and the hardware assumes a
* full dword per component. Don't use the last registers of the register file.
* Otherwise, the instruction will be skipped.
*
* https://reviews.llvm.org/D81172
*/
bool imageGather4D16Bug = operand == -1 && rc == v2 && instr->mimg().dmask != 0xF;
assert(ctx.program->chip_class == GFX9 && "Image D16 on GFX8 not supported.");
if (imageGather4D16Bug)
bounds.size -= rc.bytes() / 4;
}
}
};