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ac/llvm: fix the local invocation index for wave32

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Fixes dEQP-VK.compute.builtin_var.local_invocation_index with
RADV_PERFTEST=cswave32.

My initial fix was to lower it but Rhys suggested the shift-right
and it's much better like this.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
This commit is contained in:
Samuel Pitoiset 2019-10-31 14:00:52 +01:00
parent b99295fb33
commit bfb307aea9
1 changed files with 4 additions and 0 deletions
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4
src/amd/llvm/ac_nir_to_llvm.c
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@ -2905,6 +2905,10 @@ visit_load_local_invocation_index(struct ac_nir_context *ctx)
result = LLVMBuildAnd(ctx->ac.builder, ctx->abi->tg_size,
LLVMConstInt(ctx->ac.i32, 0xfc0, false), "");
if (ctx->ac.wave_size == 32)
result = LLVMBuildLShr(ctx->ac.builder, result,
LLVMConstInt(ctx->ac.i32, 1, false), "");
return LLVMBuildAdd(ctx->ac.builder, result, thread_id, "");
}