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Fix InstCombine/2007-10-31-StringCrash.ll by removing an obvious

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(in hindsight) infinite recursion.  Simplify the code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43597 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-11-01 02:30:35 +00:00
parent 74e012afd3
commit e41dcdc964
2 changed files with 29 additions and 12 deletions
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20
lib/VMCore/Constants.cpp
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@ -2268,18 +2268,14 @@ std::string Constant::getStringValue(bool Chop, unsigned Offset) {
}
}
}
} else if (Constant *C = dyn_cast<Constant>(this)) {
if (GlobalValue *GV = dyn_cast<GlobalValue>(C))
return GV->getStringValue(Chop, Offset);
else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
if (CE->getOpcode() == Instruction::GetElementPtr) {
// Turn a gep into the specified offset.
if (CE->getNumOperands() == 3 &&
cast<Constant>(CE->getOperand(1))->isNullValue() &&
isa<ConstantInt>(CE->getOperand(2))) {
Offset += cast<ConstantInt>(CE->getOperand(2))->getZExtValue();
return CE->getOperand(0)->getStringValue(Chop, Offset);
}
} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(this)) {
if (CE->getOpcode() == Instruction::GetElementPtr) {
// Turn a gep into the specified offset.
if (CE->getNumOperands() == 3 &&
cast<Constant>(CE->getOperand(1))->isNullValue() &&
isa<ConstantInt>(CE->getOperand(2))) {
Offset += cast<ConstantInt>(CE->getOperand(2))->getZExtValue();
return CE->getOperand(0)->getStringValue(Chop, Offset);
}
}
}

21
test/Transforms/InstCombine/2007-10-31-StringCrash.ll Normal file
View File

@ -0,0 +1,21 @@
; RUN: llvm-as < %s | opt -instcombine -disable-output
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-f80:128:128"
target triple = "i686-apple-darwin8"
declare void @__darwin_gcc3_preregister_frame_info()
define void @_start(i32 %argc, i8** %argv, i8** %envp) {
entry:
%tmp1 = bitcast void ()* @__darwin_gcc3_preregister_frame_info to i32* ; <i32*> [#uses=1]
%tmp2 = load i32* %tmp1, align 4 ; <i32> [#uses=1]
%tmp3 = icmp ne i32 %tmp2, 0 ; <i1> [#uses=1]
%tmp34 = zext i1 %tmp3 to i8 ; <i8> [#uses=1]
%toBool = icmp ne i8 %tmp34, 0 ; <i1> [#uses=1]
br i1 %toBool, label %cond_true, label %return
cond_true: ; preds = %entry
ret void
return: ; preds = %entry
ret void
}