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c0f2b8b528
LinearFunctionTestReplace tries to use the *next* indvar to compare against when possible. However, it may be the case that the calculation for the next indvar has NUW/NSW flags and that it may only be safely used inside the loop. Using it in a comparison to calculate the exit condition could result in observing poison. This fixes PR20680. Differential Revision: http://reviews.llvm.org/D5174 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217102 91177308-0d34-0410-b5e6-96231b3b80d8
60 lines
2.3 KiB
LLVM
60 lines
2.3 KiB
LLVM
; RUN: opt < %s -indvars -S | FileCheck %s
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; rdar://10359193: assert "IndVar type must match IVInit type"
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target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:32-n32-S32"
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target triple = "thumbv7-apple-darwin"
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; CHECK-LABEL: @test(
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; CHECK: if.end.i126:
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; CHECK: %exitcond = icmp ne i8* %destYPixelPtr.010.i, getelementptr (i8* null, i32 undef)
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define void @test() nounwind {
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entry:
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br label %while.cond
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while.cond:
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br i1 undef, label %while.end, label %while.body
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while.body: ; preds = %while.cond
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br i1 undef, label %if.then165, label %while.cond
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if.then165: ; preds = %while.body
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br i1 undef, label %while.cond, label %for.body.lr.ph.i81
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for.body.lr.ph.i81: ; preds = %if.then165
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br label %for.body.i86
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for.body.i86: ; preds = %for.end.i129, %for.body.lr.ph.i81
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%cmp196.i = icmp ult i32 0, undef
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br i1 %cmp196.i, label %for.body21.lr.ph.i, label %for.end.i129
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for.body21.lr.ph.i: ; preds = %for.body.i86
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br label %for.body21.i
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for.body21.i:
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%destYPixelPtr.010.i = phi i8* [ null, %for.body21.lr.ph.i ], [ %incdec.ptr.i, %if.end.i126 ]
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%x.09.i = phi i32 [ 0, %for.body21.lr.ph.i ], [ %inc.i125, %if.end.i126 ]
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br i1 undef, label %if.end.i126, label %if.else.i124
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if.else.i124: ; preds = %for.body21.i
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store i8 undef, i8* %destYPixelPtr.010.i, align 1
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br label %if.end.i126
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if.end.i126: ; preds = %if.else.i124, %for.body21.i
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%incdec.ptr.i = getelementptr inbounds i8* %destYPixelPtr.010.i, i32 1
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%inc.i125 = add i32 %x.09.i, 1
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%cmp19.i = icmp ult i32 %inc.i125, undef
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br i1 %cmp19.i, label %for.body21.i, label %for.end.i129
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for.end.i129: ; preds = %if.end.i126, %for.body.i86
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br i1 undef, label %for.body.i86, label %while.cond
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while.end: ; preds = %while.cond
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br label %bail
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bail: ; preds = %while.end, %lor.lhs.false44, %lor.lhs.false41, %if.end29, %if.end
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unreachable
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return: ; preds = %lor.lhs.false20, %lor.lhs.false12, %lor.lhs.false, %entry
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ret void
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}
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