Pass boolean constants into function calls more efficiently, generating:

mov DWORD PTR [%ESP + 4], 1

instead of:

        mov %EAX, 1
        mov DWORD PTR [%ESP + 4], %EAX

llvm-svn: 13494

llvm/lib/Target/X86/InstSelectSimple.cpp

@@ -1405,6 +1405,12 @@ void ISel::doCall(const ValueRecord &Ret, MachineInstr *CallMI,
       unsigned ArgReg;
       switch (getClassB(Args[i].Ty)) {
       case cByte:
+        if (Args[i].Val && isa<ConstantBool>(Args[i].Val)) {
+          addRegOffset(BuildMI(BB, X86::MOV32mi, 5), X86::ESP, ArgOffset)
+            .addImm(Args[i].Val == ConstantBool::True);
+          break;
+        }
+        // FALL THROUGH
       case cShort:
         if (Args[i].Val && isa<ConstantInt>(Args[i].Val)) {
           // Zero/Sign extend constant, then stuff into memory.