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ac: fix exclusive scans on GFX8-GFX9

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This fixes a regression introduced with scan&reduce operations
on GFX10. Note that some subgroups CTS still fail on GFX10 but
I assume it's a different issue.

This fixes dEQP-VK.subgroups.arithmetic.*.subgroupexclusive*.

Fixes: 227c29a80d "amd/common/gfx10: implement scan & reduce operations"
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
This commit is contained in:
Samuel Pitoiset 2019-08-21 16:29:46 +02:00
parent ce8fd042a5
commit 2d9f401a83
1 changed files with 3 additions and 4 deletions
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7
src/amd/common/ac_llvm_build.c
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@ -4221,10 +4221,9 @@ ac_build_scan(struct ac_llvm_context *ctx, nir_op op, LLVMValueRef src, LLVMValu
if (ctx->chip_class >= GFX10) {
result = inclusive ? src : identity;
} else {
if (inclusive)
result = src;
else
result = ac_build_dpp(ctx, identity, src, dpp_wf_sr1, 0xf, 0xf, false);
if (!inclusive)
src = ac_build_dpp(ctx, identity, src, dpp_wf_sr1, 0xf, 0xf, false);
result = src;
}
if (maxprefix <= 1)
return result;