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Yet another nasty spiller bug.

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%ecx = op
store %cl<kill>, (addr)
(addr) = op %al

It's not safe to unfold the last operand and eliminate store even though %cl is marked kill. It's a sub-register use which means one of its super-register(s) may be used below.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50794 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-05-07 00:49:28 +00:00
parent 42ac929ed9
commit 7ebc06bfd8
2 changed files with 56 additions and 14 deletions
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33
lib/CodeGen/VirtRegMap.cpp
View File

@ -1465,20 +1465,25 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
// the value and there isn't an earlier def that has already clobbered
// the physreg.
if (PhysReg &&
!TII->isStoreToStackSlot(&MI, SS) && // Not profitable!
DeadStore->killsRegister(PhysReg) &&
TII->unfoldMemoryOperand(MF, &MI, PhysReg, false, true, NewMIs)) {
MBB.insert(MII, NewMIs[0]);
NewStore = NewMIs[1];
MBB.insert(MII, NewStore);
VRM.addSpillSlotUse(SS, NewStore);
VRM.RemoveMachineInstrFromMaps(&MI);
MBB.erase(&MI);
Erased = true;
--NextMII;
--NextMII; // backtrack to the unfolded instruction.
BackTracked = true;
isDead = true;
!TII->isStoreToStackSlot(&MI, SS)) { // Not profitable!
MachineOperand *KillOpnd =
DeadStore->findRegisterUseOperand(PhysReg, true);
// Note, if the store is storing a sub-register, it's possible the
// super-register is needed below.
if (KillOpnd && !KillOpnd->getSubReg() &&
TII->unfoldMemoryOperand(MF, &MI, PhysReg, false, true,NewMIs)){
MBB.insert(MII, NewMIs[0]);
NewStore = NewMIs[1];
MBB.insert(MII, NewStore);
VRM.addSpillSlotUse(SS, NewStore);
VRM.RemoveMachineInstrFromMaps(&MI);
MBB.erase(&MI);
Erased = true;
--NextMII;
--NextMII; // backtrack to the unfolded instruction.
BackTracked = true;
isDead = true;
}
}
}

37
test/CodeGen/X86/2008-05-06-SpillerBug.ll Normal file
View File

@ -0,0 +1,37 @@
; RUN: llvm-as < %s | llc -mtriple=i386-apple-darwin -relocation-model=pic -disable-fp-elim | grep addb | grep ebp
%struct.rc4_state = type { i32, i32, [256 x i32] }
@.str1 = internal constant [65 x i8] c"m[%d] = 0x%02x, m[%d] = 0x%02x, 0x%02x, k = %d, key[k] = 0x%02x\0A\00" ; <[65 x i8]*> [#uses=1]
@keys = internal constant [7 x [30 x i8]] [ [30 x i8] c"\08\01#Eg\89\AB\CD\EF\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00", [30 x i8] c"\08\01#Eg\89\AB\CD\EF\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00", [30 x i8] c"\08\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00", [30 x i8] c"\04\EF\01#E\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00", [30 x i8] c"\08\01#Eg\89\AB\CD\EF\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00", [30 x i8] c"\04\EF\01#E\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00", [30 x i8] zeroinitializer ] ; <[7 x [30 x i8]]*> [#uses=1]
declare i32 @printf(i8*, ...) nounwind
define i32 @main(i32 %argc, i8** %argv) nounwind {
entry:
br label %bb25
bb25: ; preds = %bb25, %entry
br i1 false, label %bb.i, label %bb25
bb.i: ; preds = %bb.i, %bb25
br i1 false, label %bb21.i, label %bb.i
bb21.i: ; preds = %bb21.i, %bb.i
%k.0.reg2mem.0.i = phi i32 [ %k.1.i, %bb21.i ], [ 0, %bb.i ] ; <i32> [#uses=2]
%j.0.reg2mem.0.i = phi i8 [ %tmp35.i, %bb21.i ], [ 0, %bb.i ] ; <i8> [#uses=1]
%tmp25.i = load i32* null, align 4 ; <i32> [#uses=4]
%tmp2829.i = trunc i32 %tmp25.i to i8 ; <i8> [#uses=1]
%.sum = add i32 %k.0.reg2mem.0.i, 1 ; <i32> [#uses=3]
%tmp33.i = getelementptr [7 x [30 x i8]]* @keys, i32 0, i32 0, i32 %.sum ; <i8*> [#uses=1]
%tmp34.i = load i8* %tmp33.i, align 1 ; <i8> [#uses=1]
%tmp30.i = add i8 %tmp2829.i, %j.0.reg2mem.0.i ; <i8> [#uses=1]
%tmp35.i = add i8 %tmp30.i, %tmp34.i ; <i8> [#uses=2]
%tmp3536.i = zext i8 %tmp35.i to i32 ; <i32> [#uses=2]
%tmp39.i = getelementptr %struct.rc4_state* null, i32 0, i32 2, i32 %tmp3536.i ; <i32*> [#uses=1]
store i32 %tmp25.i, i32* %tmp39.i, align 4
%tmp60.i = load i32* null, align 4 ; <i32> [#uses=1]
%tmp65.i = call i32 (i8*, ...)* @printf( i8* getelementptr ([65 x i8]* @.str1, i32 0, i32 0), i32 0, i32 %tmp60.i, i32 %tmp3536.i, i32 %tmp25.i, i32 %tmp25.i, i32 %k.0.reg2mem.0.i, i32 0 ) nounwind ; <i32> [#uses=0]
%tmp70.i = icmp slt i32 %.sum, 8 ; <i1> [#uses=1]
%k.1.i = select i1 %tmp70.i, i32 %.sum, i32 0 ; <i32> [#uses=1]
br label %bb21.i
}