radeon/llvm: show LLVM disassembly when available

With code dump enabled LLVM may generate disassembly during compilation.
Show this disassembly when available and prefer it to SI bytecode dump.

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
Signed-off-by: Jay Cornwall <jay@jcornwall.me>

src/gallium/drivers/radeon/radeon_llvm_emit.c

@@ -143,6 +143,7 @@ unsigned radeon_llvm_compile(LLVMModuleRef M, struct radeon_llvm_binary *binary,
 	elf = elf_memory(elf_buffer, buffer_size);
 
 	elf_getshdrstrndx(elf, &section_str_index);
+	binary->disassembled = 0;
 
 	while ((section = elf_nextscn(elf, section))) {
 		const char *name;
@@ -163,6 +164,12 @@ unsigned radeon_llvm_compile(LLVMModuleRef M, struct radeon_llvm_binary *binary,
 			binary->config_size = section_data->d_size;
 			binary->config = MALLOC(binary->config_size * sizeof(unsigned char));
 			memcpy(binary->config, section_data->d_buf, binary->config_size);
+		} else if (dump && !strcmp(name, ".AMDGPU.disasm")) {
+			binary->disassembled = 1;
+			section_data = elf_getdata(section, section_data);
+			fprintf(stderr, "\nShader Disassembly:\n\n");
+			fprintf(stderr, "%.*s\n", (int)section_data->d_size,
+						  (char *)section_data->d_buf);
 		}
 	}
 

src/gallium/drivers/radeon/radeon_llvm_emit.h

@@ -34,6 +34,7 @@ struct radeon_llvm_binary {
 	unsigned code_size;
 	unsigned char *config;
 	unsigned config_size;
+	int disassembled;
 };
 
 void radeon_llvm_shader_type(LLVMValueRef F, unsigned type);

src/gallium/drivers/radeonsi/radeonsi_shader.c

@@ -1764,7 +1764,7 @@ int si_compile_llvm(struct r600_context *rctx, struct si_pipe_shader *shader,
 	memset(&binary, 0, sizeof(binary));
 	radeon_llvm_compile(mod, &binary,
 		r600_get_llvm_processor_name(rctx->screen->b.family), dump);
-	if (dump) {
+	if (dump && ! binary.disassembled) {
 		fprintf(stderr, "SI CODE:\n");
 		for (i = 0; i < binary.code_size; i+=4 ) {
 			fprintf(stderr, "%02x%02x%02x%02x\n", binary.code[i + 3],