forked from OSchip/llvm-project
Determine whether a spill kills the register it's spilling before insertion rather than trying to undo the kill marker afterwards.
llvm-svn: 46953
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887f5ebfa9
commit
ad4d57a2f5
llvm
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@ -303,17 +303,12 @@ void RALocal::spillVirtReg(MachineBasicBlock &MBB,
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const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(VirtReg);
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const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(VirtReg);
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int FrameIndex = getStackSpaceFor(VirtReg, RC);
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int FrameIndex = getStackSpaceFor(VirtReg, RC);
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DOUT << " to stack slot #" << FrameIndex;
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DOUT << " to stack slot #" << FrameIndex;
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TII->storeRegToStackSlot(MBB, I, PhysReg, true, FrameIndex, RC);
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// If the instruction reads the register that's spilled, (e.g. this can
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// If the instruction reads the register that's spilled, (e.g. this can
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// happen if it is a move to a physical register), then the spill
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// happen if it is a move to a physical register), then the spill
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// instruction is not a kill.
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// instruction is not a kill.
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if (I != MBB.end() && I->findRegisterUseOperandIdx(PhysReg) != -1) {
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bool isKill = !(I != MBB.end() &&
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MachineBasicBlock::iterator StoreMI = prior(I);
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I->findRegisterUseOperandIdx(PhysReg) != -1);
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int Idx = StoreMI->findRegisterUseOperandIdx(PhysReg, true);
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TII->storeRegToStackSlot(MBB, I, PhysReg, isKill, FrameIndex, RC);
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assert(Idx != -1 && "Unrecognized spill instruction!");
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StoreMI->getOperand(Idx).setIsKill(false);
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}
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++NumStores; // Update statistics
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++NumStores; // Update statistics
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}
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}
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@ -0,0 +1,10 @@
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; RUN: llvm-as < %s | llc -mtriple=powerpc-apple-darwin -regalloc=local
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define i32 @bork(i64 %foo, i64 %bar) {
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entry:
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%tmp = load i64* null, align 8 ; <i64> [#uses=2]
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%tmp2 = icmp ule i64 %tmp, 0 ; <i1> [#uses=1]
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%min = select i1 %tmp2, i64 %tmp, i64 0 ; <i64> [#uses=1]
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store i64 %min, i64* null, align 8
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ret i32 0
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}
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