Disassemble in the format of "<result-id> = <opcode> <operand>..".

source/binary.cpp

@@ -348,7 +348,10 @@ spv_result_t spvBinaryDecodeOpcode(
                       << "'.";
            return SPV_ERROR_INVALID_BINARY);
 
-  stream.get() << "Op" << opcodeEntry->name;
+  std::stringstream no_result_id_strstream;
+  out_stream no_result_id_stream(no_result_id_strstream);
+  const int16_t result_id_index = spvOpcodeResultIdIndex(opcodeEntry);
+  no_result_id_stream.get() << "Op" << opcodeEntry->name;
 
   position->index++;
 
@@ -357,17 +360,21 @@ spv_result_t spvBinaryDecodeOpcode(
     const uint32_t word = spvFixWord(pInst->words[index], endian);
     const uint64_t currentPosIndex = position->index;
 
-    stream.get() << " ";
+    if (result_id_index != index - 1) no_result_id_strstream << " ";
     spv_operand_type_t type = spvBinaryOperandInfo(word, index, opcodeEntry,
                                                    operandTable, &operandEntry);
     spvCheck(spvBinaryDecodeOperand(
                  opcodeEntry->opcode, type, pInst->words + index, endian,
                  options, operandTable, extInstTable, &pInst->extInstType,
-                 stream, position, pDiagnostic),
+                 (result_id_index == index - 1 ? stream : no_result_id_stream),
+                 position, pDiagnostic),
              return SPV_ERROR_INVALID_BINARY);
+    if (result_id_index == index - 1) stream.get() << " = ";
     index += (uint16_t)(position->index - currentPosIndex - 1);
   }
 
+  stream.get() << no_result_id_strstream.str();
+
   return SPV_SUCCESS;
 }
 

test/BinaryToText.cpp

@@ -35,7 +35,7 @@ class BinaryToText : public ::testing::Test {
     ASSERT_EQ(SPV_SUCCESS, spvOperandTableGet(&operandTable));
     ASSERT_EQ(SPV_SUCCESS, spvExtInstTableGet(&extInstTable));
 
-    const char *textStr = R"(
+    const char* textStr = R"(
       OpSource OpenCL 12
       OpMemoryModel Physical64 OpenCL
       OpSourceExtension "PlaceholderExtensionName"
@@ -141,16 +141,16 @@ TEST_P(BinaryToTextGLExtSingleFloatInst, Default) {
   ASSERT_EQ(SPV_SUCCESS, spvExtInstTableGet(&extInstTable));
   const std::string spirv = R"(
 OpCapability Shader
-OpExtInstImport %1 "GLSL.std.450"
+%1 = OpExtInstImport "GLSL.std.450"
 OpMemoryModel Logical Simple
 OpEntryPoint Vertex %2 "main"
-OpTypeVoid %3
-OpTypeFloat %4 32
-OpConstant %4 %5 1
-OpTypeFunction %6 %3
-OpFunction %3 %2 None %6
-OpLabel %8
-OpExtInst %4 %9 %1 )" + std::string(GetParam().inst) +
+%3 = OpTypeVoid
+%4 = OpTypeFloat 32
+%5 = OpConstant %4 1
+%6 = OpTypeFunction %3
+%2 = OpFunction %3 None %6
+%8 = OpLabel
+%9 = OpExtInst %4 %1 )" + std::string(GetParam().inst) +
                             R"( %5
 OpReturn
 OpFunctionEnd
@@ -176,9 +176,9 @@ OpFunctionEnd
   }
 
   spv_text output_text;
-  error = spvBinaryToText(
-      binary, SPV_BINARY_TO_TEXT_OPTION_NONE,
-      opcodeTable, operandTable, extInstTable, &output_text, &diagnostic);
+  error =
+      spvBinaryToText(binary, SPV_BINARY_TO_TEXT_OPTION_NONE, opcodeTable,
+                      operandTable, extInstTable, &output_text, &diagnostic);
 
   if (error) {
     spvDiagnosticPrint(diagnostic);