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65f2077c62
It also makes it more aggressive in querying range information by adding a call to isKnownPredicateWithRanges to isLoopBackedgeGuardedByCond and isLoopEntryGuardedByCond. phabricator: http://reviews.llvm.org/D5638 Reviewed by: atrick, hfinkel git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219532 91177308-0d34-0410-b5e6-96231b3b80d8
38 lines
782 B
LLVM
38 lines
782 B
LLVM
;; RUN: opt -S < %s -indvars | FileCheck %s
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;; Check if IndVarSimplify understands !range metadata.
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declare void @abort()
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define i1 @iterate(i32* nocapture readonly %buffer) {
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entry:
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%length = load i32* %buffer, !range !0
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br label %loop.preheader
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loop.preheader:
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br label %loop
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loop:
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%idx = phi i32 [ %idx.inc, %loop.next ], [ 0, %loop.preheader ]
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%oob.pred = icmp slt i32 %idx, %length
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br i1 %oob.pred, label %loop.next, label %oob
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; CHECK: br i1 true, label %loop.next, label %oob
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loop.next:
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%idx.inc = add i32 %idx, 1
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%exit.pred = icmp slt i32 %idx.inc, %length
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br i1 %exit.pred, label %loop, label %abort.loopexit
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abort.loopexit:
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br label %abort
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abort:
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ret i1 false
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oob:
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tail call void @abort()
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ret i1 false
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}
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!0 = metadata !{i32 1, i32 100}
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