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If a MI uses the same register more than once, only mark one of them as 'kill'.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66363 91177308-0d34-0410-b5e6-96231b3b80d8
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Evan Cheng
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@ -1317,6 +1317,23 @@ void LocalSpiller::TransferDeadness(MachineBasicBlock *MBB, unsigned CurDist,
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}
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}
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/// hasLaterNon2AddrUse - If the MI has another use of the specified virtual
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/// register later and it's not a two-address, return true. That means it's
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/// safe to mark the current use at 'i' isKill.
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static bool hasLaterNon2AddrUse(MachineInstr &MI, unsigned i, unsigned VirtReg){
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const TargetInstrDesc &TID = MI.getDesc();
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++i;
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for (unsigned e = TID.getNumOperands(); i != e; ++i) {
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const MachineOperand &MO = MI.getOperand(i);
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if (!MO.isReg() || MO.getReg() != VirtReg)
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continue;
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if (TID.getOperandConstraint(i, TOI::TIED_TO) == -1)
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return true;
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}
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return false;
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}
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/// rewriteMBB - Keep track of which spills are available even after the
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/// register allocator is done with them. If possible, avid reloading vregs.
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void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM,
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@ -1581,9 +1598,7 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM,
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// apply, reuse it.
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bool CanReuse = true;
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int ti = TID.getOperandConstraint(i, TOI::TIED_TO);
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if (ti != -1 &&
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MI.getOperand(ti).isReg() &&
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MI.getOperand(ti).getReg() == VirtReg) {
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if (ti != -1) {
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// Okay, we have a two address operand. We can reuse this physreg as
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// long as we are allowed to clobber the value and there isn't an
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// earlier def that has already clobbered the physreg.
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@ -1637,9 +1652,10 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM,
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PotentialDeadStoreSlots.push_back(ReuseSlot);
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}
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// Assumes this is the last use. IsKill will be unset if reg is reused
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// unless it's a two-address operand.
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if (ti == -1)
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// Mark is isKill if it's there no other uses of the same virtual
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// register and it's not a two-address operand. IsKill will be
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// unset if reg is reused.
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if (ti == -1 && !hasLaterNon2AddrUse(MI, i, VirtReg))
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MI.getOperand(i).setIsKill();
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continue;
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} // CanReuse
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78
test/CodeGen/ARM/2009-03-07-SpillerBug.ll
Normal file
78
test/CodeGen/ARM/2009-03-07-SpillerBug.ll
Normal file
@ -0,0 +1,78 @@
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; RUN: llvm-as < %s | llc -mtriple=armv6-apple-darwin9 -mattr=+vfp2
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; rdar://6653182
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%struct.ggBRDF = type { i32 (...)** }
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%struct.ggPoint2 = type { [2 x double] }
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%struct.ggPoint3 = type { [3 x double] }
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%struct.ggSpectrum = type { [8 x float] }
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%struct.ggSphere = type { %struct.ggPoint3, double }
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%struct.mrDiffuseAreaSphereLuminaire = type { %struct.mrSphere, %struct.ggSpectrum }
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%struct.mrDiffuseCosineSphereLuminaire = type { %struct.mrDiffuseAreaSphereLuminaire }
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%struct.mrSphere = type { %struct.ggBRDF, %struct.ggSphere }
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declare void @llvm.memcpy.i32(i8* nocapture, i8* nocapture, i32, i32) nounwind
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declare double @llvm.sqrt.f64(double) nounwind readonly
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declare double @sin(double) nounwind readonly
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declare double @acos(double) nounwind readonly
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define i32 @_ZNK34mrDiffuseSolidAngleSphereLuminaire18selectVisiblePointERK8ggPoint3RK9ggVector3RK8ggPoint2dRS0_Rd(%struct.mrDiffuseCosineSphereLuminaire* nocapture %this, %struct.ggPoint3* nocapture %x, %struct.ggPoint3* nocapture %unnamed_arg, %struct.ggPoint2* nocapture %uv, double %unnamed_arg2, %struct.ggPoint3* nocapture %on_light, double* nocapture %invProb) nounwind {
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entry:
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%0 = call double @llvm.sqrt.f64(double 0.000000e+00) nounwind ; <double> [#uses=4]
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%1 = fcmp ult double 0.000000e+00, %0 ; <i1> [#uses=1]
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br i1 %1, label %bb3, label %bb7
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bb3: ; preds = %entry
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%2 = fdiv double 1.000000e+00, 0.000000e+00 ; <double> [#uses=1]
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%3 = mul double 0.000000e+00, %2 ; <double> [#uses=2]
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%4 = call double @llvm.sqrt.f64(double 0.000000e+00) nounwind ; <double> [#uses=1]
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%5 = fdiv double 1.000000e+00, %4 ; <double> [#uses=2]
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%6 = mul double %3, %5 ; <double> [#uses=2]
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%7 = mul double 0.000000e+00, %5 ; <double> [#uses=2]
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%8 = mul double %3, %7 ; <double> [#uses=1]
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%9 = sub double %8, 0.000000e+00 ; <double> [#uses=1]
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%10 = mul double 0.000000e+00, %6 ; <double> [#uses=1]
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%11 = sub double 0.000000e+00, %10 ; <double> [#uses=1]
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%12 = sub double -0.000000e+00, %11 ; <double> [#uses=1]
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%13 = mul double %0, %0 ; <double> [#uses=2]
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%14 = sub double %13, 0.000000e+00 ; <double> [#uses=1]
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%15 = call double @llvm.sqrt.f64(double %14) ; <double> [#uses=1]
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%16 = mul double 0.000000e+00, %15 ; <double> [#uses=1]
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%17 = fdiv double %16, %0 ; <double> [#uses=1]
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%18 = add double 0.000000e+00, %17 ; <double> [#uses=1]
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%19 = call double @acos(double %18) nounwind readonly ; <double> [#uses=1]
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%20 = load double* null, align 4 ; <double> [#uses=1]
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%21 = mul double %20, 0x401921FB54442D18 ; <double> [#uses=1]
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%22 = call double @sin(double %19) nounwind readonly ; <double> [#uses=2]
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%23 = mul double %22, 0.000000e+00 ; <double> [#uses=2]
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%24 = mul double %6, %23 ; <double> [#uses=1]
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%25 = mul double %7, %23 ; <double> [#uses=1]
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%26 = call double @sin(double %21) nounwind readonly ; <double> [#uses=1]
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%27 = mul double %22, %26 ; <double> [#uses=2]
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%28 = mul double %9, %27 ; <double> [#uses=1]
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%29 = mul double %27, %12 ; <double> [#uses=1]
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%30 = add double %24, %28 ; <double> [#uses=1]
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%31 = add double 0.000000e+00, %29 ; <double> [#uses=1]
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%32 = add double %25, 0.000000e+00 ; <double> [#uses=1]
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%33 = add double %30, 0.000000e+00 ; <double> [#uses=1]
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%34 = add double %31, 0.000000e+00 ; <double> [#uses=1]
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%35 = add double %32, 0.000000e+00 ; <double> [#uses=1]
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%36 = bitcast %struct.ggPoint3* %x to i8* ; <i8*> [#uses=1]
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call void @llvm.memcpy.i32(i8* null, i8* %36, i32 24, i32 4) nounwind
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store double %33, double* null, align 8
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br i1 false, label %_Z20ggRaySphereIntersectRK6ggRay3RK8ggSphereddRd.exit, label %bb5.i.i.i
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bb5.i.i.i: ; preds = %bb3
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unreachable
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_Z20ggRaySphereIntersectRK6ggRay3RK8ggSphereddRd.exit: ; preds = %bb3
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%37 = sub double %13, 0.000000e+00 ; <double> [#uses=0]
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%38 = sub double -0.000000e+00, %34 ; <double> [#uses=0]
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%39 = sub double -0.000000e+00, %35 ; <double> [#uses=0]
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ret i32 1
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bb7: ; preds = %entry
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ret i32 0
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}
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