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One more place where subreg lowering forgot to transfer undefness.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78144 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-08-05 01:57:22 +00:00
parent 98ca4f2a32
commit a72dfb522d
2 changed files with 48 additions and 3 deletions
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9
lib/CodeGen/LowerSubregs.cpp
View File

@ -242,9 +242,12 @@ bool LowerSubregsInstructionPass::LowerInsert(MachineInstr *MI) {
// No need to insert an identity copy instruction. If the SrcReg was
// <undef>, we need to make sure it is alive by inserting an IMPLICIT_DEF
if (MI->getOperand(1).isUndef() && !MI->getOperand(0).isDead()) {
BuildMI(*MBB, MI, MI->getDebugLoc(),
TII.get(TargetInstrInfo::IMPLICIT_DEF), DstReg)
.addReg(InsReg, RegState::ImplicitKill);
MachineInstrBuilder MIB = BuildMI(*MBB, MI, MI->getDebugLoc(),
TII.get(TargetInstrInfo::IMPLICIT_DEF), DstReg);
if (MI->getOperand(2).isUndef())
MIB.addReg(InsReg, RegState::Implicit | RegState::Undef);
else
MIB.addReg(InsReg, RegState::ImplicitKill);
} else {
DOUT << "subreg: eliminated!\n";
MBB->erase(MI);

42
test/CodeGen/Thumb2/2009-08-04-SubregLoweringBug2.ll Normal file
View File

@ -0,0 +1,42 @@
; RUN: llvm-as < %s | llc -mtriple=thumbv7-apple-darwin9 -mattr=+neon,+neonfp
; rdar://7117307
%struct.Hosp = type { i32, i32, i32, %struct.List, %struct.List, %struct.List, %struct.List }
%struct.List = type { %struct.List*, %struct.Patient*, %struct.List* }
%struct.Patient = type { i32, i32, i32, %struct.Village* }
%struct.Village = type { [4 x %struct.Village*], %struct.Village*, %struct.List, %struct.Hosp, i32, i32 }
define arm_apcscc %struct.List* @sim(%struct.Village* %village) nounwind {
entry:
br i1 undef, label %bb14, label %bb3.preheader
bb3.preheader: ; preds = %entry
br label %bb5
bb5: ; preds = %bb5, %bb3.preheader
br i1 undef, label %bb11, label %bb5
bb11: ; preds = %bb5
%0 = fmul float undef, 0x41E0000000000000 ; <float> [#uses=1]
%1 = fptosi float %0 to i32 ; <i32> [#uses=1]
store i32 %1, i32* undef, align 4
br i1 undef, label %generate_patient.exit, label %generate_patient.exit.thread
generate_patient.exit.thread: ; preds = %bb11
ret %struct.List* null
generate_patient.exit: ; preds = %bb11
br i1 undef, label %bb14, label %bb12
bb12: ; preds = %generate_patient.exit
br i1 undef, label %bb.i, label %bb1.i
bb.i: ; preds = %bb12
ret %struct.List* null
bb1.i: ; preds = %bb12
ret %struct.List* null
bb14: ; preds = %generate_patient.exit, %entry
ret %struct.List* undef
}