[turbofan] IA: Uint32ToFloat64 supports mem operand.

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index f93ad21a219a09c0ca51f556dbf9d457a8a58ad1..c17da8f79b793f93d04ff0d3eebb3670d7afdb1d 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -486,8 +486,12 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       break;
     }
     case kSSEUint32ToFloat64: {
-      // TODO(turbofan): X64 SSE cvtqsi2sd should support operands.
-      __ cvtqsi2sd(i.OutputDoubleRegister(), i.InputRegister(0));
+      RegisterOrOperand input = i.InputRegisterOrOperand(0);
+      if (input.type == kRegister) {
+        __ cvtqsi2sd(i.OutputDoubleRegister(), input.reg);
+      } else {
+        __ cvtqsi2sd(i.OutputDoubleRegister(), input.operand);
+      }
       break;
     }
     case kX64Movsxbl: