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Fix PR5300.

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When TwoAddressInstructionPass deletes a dead instruction, make sure that all
register kills are accounted for. The 2-addr register does not get special
treatment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89246 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2009-11-18 21:33:35 +00:00
parent 2d6a8fb827
commit 0b25ae1afb
2 changed files with 34 additions and 12 deletions
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17
lib/CodeGen/TwoAddressInstructionPass.cpp
View File

@ -112,8 +112,7 @@ namespace {
MachineBasicBlock *MBB, unsigned Dist);
bool DeleteUnusedInstr(MachineBasicBlock::iterator &mi,
MachineBasicBlock::iterator &nmi,
MachineFunction::iterator &mbbi,
unsigned regB, unsigned regBIdx, unsigned Dist);
MachineFunction::iterator &mbbi, unsigned Dist);
bool TryInstructionTransform(MachineBasicBlock::iterator &mi,
MachineBasicBlock::iterator &nmi,
@ -730,7 +729,7 @@ void TwoAddressInstructionPass::ProcessCopy(MachineInstr *MI,
/// isSafeToDelete - If the specified instruction does not produce any side
/// effects and all of its defs are dead, then it's safe to delete.
static bool isSafeToDelete(MachineInstr *MI, unsigned Reg,
static bool isSafeToDelete(MachineInstr *MI,
const TargetInstrInfo *TII,
SmallVector<unsigned, 4> &Kills) {
const TargetInstrDesc &TID = MI->getDesc();
@ -745,10 +744,9 @@ static bool isSafeToDelete(MachineInstr *MI, unsigned Reg,
continue;
if (MO.isDef() && !MO.isDead())
return false;
if (MO.isUse() && MO.getReg() != Reg && MO.isKill())
if (MO.isUse() && MO.isKill())
Kills.push_back(MO.getReg());
}
return true;
}
@ -783,11 +781,10 @@ bool
TwoAddressInstructionPass::DeleteUnusedInstr(MachineBasicBlock::iterator &mi,
MachineBasicBlock::iterator &nmi,
MachineFunction::iterator &mbbi,
unsigned regB, unsigned regBIdx,
unsigned Dist) {
// Check if the instruction has no side effects and if all its defs are dead.
SmallVector<unsigned, 4> Kills;
if (!isSafeToDelete(mi, regB, TII, Kills))
if (!isSafeToDelete(mi, TII, Kills))
return false;
// If this instruction kills some virtual registers, we need to
@ -810,10 +807,6 @@ TwoAddressInstructionPass::DeleteUnusedInstr(MachineBasicBlock::iterator &mi,
LV->addVirtualRegisterKilled(Kill, NewKill);
}
}
// If regB was marked as a kill, update its Kills list.
if (mi->getOperand(regBIdx).isKill())
LV->removeVirtualRegisterKilled(regB, mi);
}
mbbi->erase(mi); // Nuke the old inst.
@ -842,7 +835,7 @@ TryInstructionTransform(MachineBasicBlock::iterator &mi,
// it so it doesn't clobber regB.
bool regBKilled = isKilled(*mi, regB, MRI, TII);
if (!regBKilled && mi->getOperand(DstIdx).isDead() &&
DeleteUnusedInstr(mi, nmi, mbbi, regB, SrcIdx, Dist)) {
DeleteUnusedInstr(mi, nmi, mbbi, Dist)) {
++NumDeletes;
return true; // Done with this instruction.
}

29
test/CodeGen/X86/2009-11-18-TwoAddrKill.ll Normal file
View File

@ -0,0 +1,29 @@
; RUN: llc < %s
; PR 5300
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32"
target triple = "i386-pc-linux-gnu"
@g_296 = external global i8, align 1 ; <i8*> [#uses=1]
define noalias i8** @func_31(i32** nocapture %int8p_33, i8** nocapture %p_34, i8* nocapture %p_35) nounwind {
entry:
%cmp.i = icmp sgt i16 undef, 234 ; <i1> [#uses=1]
%tmp17 = select i1 %cmp.i, i16 undef, i16 0 ; <i16> [#uses=2]
%conv8 = trunc i16 %tmp17 to i8 ; <i8> [#uses=3]
br i1 undef, label %cond.false.i29, label %land.lhs.true.i
land.lhs.true.i: ; preds = %entry
%tobool5.i = icmp eq i32 undef, undef ; <i1> [#uses=1]
br i1 %tobool5.i, label %cond.false.i29, label %bar.exit
cond.false.i29: ; preds = %land.lhs.true.i, %entry
%tmp = sub i8 0, %conv8 ; <i8> [#uses=1]
%mul.i = and i8 %conv8, %tmp ; <i8> [#uses=1]
br label %bar.exit
bar.exit: ; preds = %cond.false.i29, %land.lhs.true.i
%call1231 = phi i8 [ %mul.i, %cond.false.i29 ], [ %conv8, %land.lhs.true.i ] ; <i8> [#uses=0]
%conv21 = trunc i16 %tmp17 to i8 ; <i8> [#uses=1]
store i8 %conv21, i8* @g_296
ret i8** undef
}