[Mesa-dev] [PATCH 1/2] ac/nir: Don't load the descriptor in vulkan_resource_index.

[Bas Nieuwenhuizen]

To support the reindex intrinsic, we need the result to be
something on which we can adjust the index/address.

Since it is all within a basic block, the compiler should be
able to merge any extra loads.
---
 src/amd/common/ac_nir_to_llvm.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index 663b27d265a..c33408491a9 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -2227,7 +2227,7 @@ static LLVMValueRef visit_vulkan_resource_index(struct nir_to_llvm_context *ctx,
 	desc_ptr = cast_ptr(ctx, desc_ptr, ctx->ac.v4i32);
 	LLVMSetMetadata(desc_ptr, ctx->ac.uniform_md_kind, ctx->ac.empty_md);
 
-	return LLVMBuildLoad(ctx->builder, desc_ptr, "");
+	return desc_ptr;
 }
 
 static LLVMValueRef visit_load_push_constant(struct nir_to_llvm_context *ctx,
@@ -4233,14 +4233,21 @@ static void visit_intrinsic(struct ac_nir_context *ctx,
 }
 
 static LLVMValueRef radv_load_ssbo(struct ac_shader_abi *abi,
-				   LLVMValueRef buffer, bool write)
+				   LLVMValueRef buffer_ptr, bool write)
 {
 	struct nir_to_llvm_context *ctx = nir_to_llvm_context_from_abi(abi);
 
 	if (write && ctx->stage == MESA_SHADER_FRAGMENT)
 		ctx->shader_info->fs.writes_memory = true;
 
-	return buffer;
+	return LLVMBuildLoad(ctx->builder, buffer_ptr, "");
+}
+
+static LLVMValueRef radv_load_ubo(struct ac_shader_abi *abi, LLVMValueRef buffer_ptr)
+{
+	struct nir_to_llvm_context *ctx = nir_to_llvm_context_from_abi(abi);
+
+	return LLVMBuildLoad(ctx->builder, buffer_ptr, "");
 }
 
 static LLVMValueRef radv_get_sampler_desc(struct ac_shader_abi *abi,
@@ -6541,6 +6548,7 @@ LLVMModuleRef ac_translate_nir_to_llvm(LLVMTargetMachineRef tm,
 	ctx.abi.inputs = &ctx.inputs[0];
 	ctx.abi.emit_outputs = handle_shader_outputs_post;
 	ctx.abi.emit_vertex = visit_emit_vertex;
+	ctx.abi.load_ubo = radv_load_ubo;
 	ctx.abi.load_ssbo = radv_load_ssbo;
 	ctx.abi.load_sampler_desc = radv_get_sampler_desc;
 	ctx.abi.clamp_shadow_reference = false;
-- 
2.15.0