Preserve <undef> flags in ARMExpandPseudo.
This probably mostly shows up in bugpoint-generated code.
llvm-svn: 158527
diff --git a/llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp b/llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp
index ac9163f..a242b13 100644
--- a/llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp
+++ b/llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp
@@ -459,22 +459,23 @@
MIB.addOperand(MI.getOperand(OpIdx++));
bool SrcIsKill = MI.getOperand(OpIdx).isKill();
+ bool SrcIsUndef = MI.getOperand(OpIdx).isUndef();
unsigned SrcReg = MI.getOperand(OpIdx++).getReg();
unsigned D0, D1, D2, D3;
GetDSubRegs(SrcReg, RegSpc, TRI, D0, D1, D2, D3);
- MIB.addReg(D0);
+ MIB.addReg(D0, getUndefRegState(SrcIsUndef));
if (NumRegs > 1 && TableEntry->copyAllListRegs)
- MIB.addReg(D1);
+ MIB.addReg(D1, getUndefRegState(SrcIsUndef));
if (NumRegs > 2 && TableEntry->copyAllListRegs)
- MIB.addReg(D2);
+ MIB.addReg(D2, getUndefRegState(SrcIsUndef));
if (NumRegs > 3 && TableEntry->copyAllListRegs)
- MIB.addReg(D3);
+ MIB.addReg(D3, getUndefRegState(SrcIsUndef));
// Copy the predicate operands.
MIB.addOperand(MI.getOperand(OpIdx++));
MIB.addOperand(MI.getOperand(OpIdx++));
- if (SrcIsKill) // Add an implicit kill for the super-reg.
+ if (SrcIsKill && !SrcIsUndef) // Add an implicit kill for the super-reg.
MIB->addRegisterKilled(SrcReg, TRI, true);
TransferImpOps(MI, MIB, MIB);
diff --git a/llvm/test/CodeGen/ARM/2012-01-24-RegSequenceLiveRange.ll b/llvm/test/CodeGen/ARM/2012-01-24-RegSequenceLiveRange.ll
index 872eca3..f1c85f1 100644
--- a/llvm/test/CodeGen/ARM/2012-01-24-RegSequenceLiveRange.ll
+++ b/llvm/test/CodeGen/ARM/2012-01-24-RegSequenceLiveRange.ll
@@ -60,8 +60,16 @@
ret void
}
+; Check that pseudo-expansion preserves <undef> flags.
+define void @foo3(i8* %p) nounwind ssp {
+entry:
+ tail call void @llvm.arm.neon.vst2.v4f32(i8* %p, <4 x float> undef, <4 x float> undef, i32 4)
+ ret void
+}
+
declare arm_aapcs_vfpcc void @bar(i8*, float, float, float)
declare void @llvm.arm.neon.vst1.v4f32(i8*, <4 x float>, i32) nounwind
+declare void @llvm.arm.neon.vst2.v4f32(i8*, <4 x float>, <4 x float>, i32) nounwind
!0 = metadata !{metadata !"omnipotent char", metadata !1}
!1 = metadata !{metadata !"Simple C/C++ TBAA", null}