MachineFrameInfo *MFI, const MachineRegisterInfo *MRI,
const X86InstrInfo *TII, const CCValAssign &VA) {
unsigned Bytes = Arg.getValueType().getSizeInBits() / 8;
+
+ for (;;) {
+ // Look through nodes that don't alter the bits of the incoming value.
+ unsigned Op = Arg.getOpcode();
+ if (Op == ISD::ZERO_EXTEND || Op == ISD::ANY_EXTEND || Op == ISD::BITCAST) {
+ Arg = Arg.getOperand(0);
+ continue;
+ }
+ if (Op == ISD::TRUNCATE) {
+ const SDValue &TruncInput = Arg.getOperand(0);
+ if (TruncInput.getOpcode() == ISD::AssertZext &&
+ cast<VTSDNode>(TruncInput.getOperand(1))->getVT() ==
+ Arg.getValueType()) {
+ Arg = TruncInput.getOperand(0);
+ continue;
+ }
+ }
+ break;
+ }
+
int FI = INT_MAX;
if (Arg.getOpcode() == ISD::CopyFromReg) {
unsigned VR = cast<RegisterSDNode>(Arg.getOperand(1))->getReg();
--- /dev/null
+; RUN: llc -mtriple=i686-unknown-linux-gnu -o - %s | FileCheck %s
+
+declare void @g_bool(i1 zeroext)
+define void @f_bool(i1 zeroext %x) {
+entry:
+ tail call void @g_bool(i1 zeroext %x)
+ ret void
+
+; Forwarding a bool in a tail call works.
+; CHECK-LABEL: f_bool:
+; CHECK-NOT: movz
+; CHECK: jmp g_bool
+}
+
+
+declare void @g_float(float)
+define void @f_i32(i32 %x) {
+entry:
+ %0 = bitcast i32 %x to float
+ tail call void @g_float(float %0)
+ ret void
+
+; Forwarding a bitcasted value works too.
+; CHECK-LABEL: f_i32
+; CHECK-NOT: mov
+; CHECK: jmp g_float
+}