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radeonsi: use a trick to extract and pack edgeflags using fewer instructions

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This removes 4 instructions from the prim export packing.

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12343>
This commit is contained in:
Marek Olšák
2021-08-31 21:45:21 -04:00
committed by Marge Bot
parent 2d8dfb9111
commit b330c7cb2a
4 changed files with 15 additions and 29 deletions
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4
src/amd/llvm/ac_llvm_build.c
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@@ -4627,13 +4627,11 @@ LLVMValueRef ac_pack_prim_export(struct ac_llvm_context *ctx, const struct ac_ng
LLVMBuilderRef builder = ctx->builder;
LLVMValueRef tmp = LLVMBuildZExt(builder, prim->isnull, ctx->i32, "");
LLVMValueRef result = LLVMBuildShl(builder, tmp, LLVMConstInt(ctx->i32, 31, false), "");
result = LLVMBuildOr(ctx->builder, result, prim->edgeflags, "");
for (unsigned i = 0; i < prim->num_vertices; ++i) {
tmp = LLVMBuildShl(builder, prim->index[i], LLVMConstInt(ctx->i32, 10 * i, false), "");
result = LLVMBuildOr(builder, result, tmp, "");
tmp = LLVMBuildZExt(builder, prim->edgeflag[i], ctx->i32, "");
tmp = LLVMBuildShl(builder, tmp, LLVMConstInt(ctx->i32, 10 * i + 9, false), "");
result = LLVMBuildOr(builder, result, tmp, "");
}
return result;
}