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[InstructionCombining] prepareICWorklistFromFunction halts in infinite loop with instructions of token type

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Summary: This patch fixes a bug in prepareICWorklistFromFunction, where the loop becomes infinite with instructions of token type. The patch checks if the instruction is token type, and if so it updates EndInst with the current instruction.

Reviewers: reames, majnemer

Subscribers: llvm-commits, sanjoy

Differential Revision: http://reviews.llvm.org/D15859

llvm-svn: 256792
This commit is contained in:
Chen Li 2016-01-04 23:28:57 +00:00
parent e81d5fcd14
commit 10e521338c
2 changed files with 19 additions and 3 deletions
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3
lib/Transforms/InstCombine/InstructionCombining.cpp
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@ -3021,7 +3021,7 @@ static bool prepareICWorklistFromFunction(Function &F, const DataLayout &DL,
Instruction *Inst = &*--EndInst->getIterator();
if (!Inst->use_empty() && !Inst->getType()->isTokenTy())
Inst->replaceAllUsesWith(UndefValue::get(Inst->getType()));
if (Inst->isEHPad()) {
if (Inst->isEHPad() || Inst->getType()->isTokenTy()) {
EndInst = Inst;
continue;
}
@ -3029,7 +3029,6 @@ static bool prepareICWorklistFromFunction(Function &F, const DataLayout &DL,
++NumDeadInst;
MadeIRChange = true;
}
if (!Inst->getType()->isTokenTy())
Inst->eraseFromParent();
}
}

17
test/Transforms/InstCombine/token.ll
View File

@ -85,5 +85,22 @@ unreachable:
; CHECK: %Y = zext i8 %B to i32
; CHECK: %phi = phi i32 [ %X, %bb ], [ %Y, %cont ], [ %Y, %cont2 ]
declare void @foo()
declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)
define void @test4(i8 addrspace(1)* %obj) gc "statepoint-example" {
bb:
unreachable
unreachable:
call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
ret void
}
; CHECK-LABEL: define void @test4(
; CHECK: unreachable:
; CHECK: call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
; CHECK: ret void
declare void @g(i32)