diff options
| -rw-r--r-- | lib/CodeGen/LowerSubregs.cpp | 18 | ||||
| -rw-r--r-- | test/CodeGen/ARM/2010-06-29-SubregImpDefs.ll | 15 |
2 files changed, 33 insertions, 0 deletions
diff --git a/lib/CodeGen/LowerSubregs.cpp b/lib/CodeGen/LowerSubregs.cpp index 78d8de4b67..2dfd07f7f2 100644 --- a/lib/CodeGen/LowerSubregs.cpp +++ b/lib/CodeGen/LowerSubregs.cpp @@ -62,6 +62,7 @@ namespace { void TransferKillFlag(MachineInstr *MI, unsigned SrcReg, const TargetRegisterInfo *TRI, bool AddIfNotFound = false); + void TransferImplicitDefs(MachineInstr *MI); }; char LowerSubregsInstructionPass::ID = 0; @@ -104,6 +105,22 @@ LowerSubregsInstructionPass::TransferKillFlag(MachineInstr *MI, } } +/// TransferImplicitDefs - MI is a pseudo-instruction, and the lowered +/// replacement instructions immediately precede it. Copy any implicit-def +/// operands from MI to the replacement instruction. +void +LowerSubregsInstructionPass::TransferImplicitDefs(MachineInstr *MI) { + MachineBasicBlock::iterator CopyMI = MI; + --CopyMI; + + for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { + MachineOperand &MO = MI->getOperand(i); + if (!MO.isReg() || !MO.isImplicit() || MO.isUse()) + continue; + CopyMI->addOperand(MachineOperand::CreateReg(MO.getReg(), true, true)); + } +} + bool LowerSubregsInstructionPass::LowerExtract(MachineInstr *MI) { MachineBasicBlock *MBB = MI->getParent(); @@ -149,6 +166,7 @@ bool LowerSubregsInstructionPass::LowerExtract(MachineInstr *MI) { TransferDeadFlag(MI, DstReg, TRI); if (MI->getOperand(1).isKill()) TransferKillFlag(MI, SuperReg, TRI, true); + TransferImplicitDefs(MI); DEBUG({ MachineBasicBlock::iterator dMI = MI; dbgs() << "subreg: " << *(--dMI); diff --git a/test/CodeGen/ARM/2010-06-29-SubregImpDefs.ll b/test/CodeGen/ARM/2010-06-29-SubregImpDefs.ll new file mode 100644 index 0000000000..984583e806 --- /dev/null +++ b/test/CodeGen/ARM/2010-06-29-SubregImpDefs.ll @@ -0,0 +1,15 @@ +; RUN: llc < %s -march=arm -mattr=+neon + +@.str271 = external constant [21 x i8], align 4 ; <[21 x i8]*> [#uses=1] +@llvm.used = appending global [1 x i8*] [i8* bitcast (i32 (i32, i8**)* @main to i8*)], section "llvm.metadata" ; <[1 x i8*]*> [#uses=0] + +define i32 @main(i32 %argc, i8** %argv) nounwind { +entry: + %0 = shufflevector <2 x i64> undef, <2 x i64> zeroinitializer, <2 x i32> <i32 1, i32 2> ; <<2 x i64>> [#uses=1] + store <2 x i64> %0, <2 x i64>* undef, align 16 + %val4723 = load <8 x i16>* undef ; <<8 x i16>> [#uses=1] + call void @PrintShortX(i8* getelementptr inbounds ([21 x i8]* @.str271, i32 0, i32 0), <8 x i16> %val4723, i32 0) nounwind + ret i32 undef +} + +declare void @PrintShortX(i8*, <8 x i16>, i32) nounwind |