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231fe284cd
Also, generalize ScalarEvolutions's min and max recognition to handle some new forms of min and max that this change makes more common. llvm-svn: 102234
28 lines
1.1 KiB
LLVM
28 lines
1.1 KiB
LLVM
; RUN: opt -analyze -scalar-evolution < %s | FileCheck %s
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; ScalarEvolution should be able to use nsw information to prove that
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; this loop has a finite trip count.
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; CHECK: @le
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; CHECK: Loop %for.body: backedge-taken count is %n
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; CHECK: Loop %for.body: max backedge-taken count is 9223372036854775807
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define void @le(i64 %n, double* nocapture %p) nounwind {
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entry:
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%cmp6 = icmp slt i64 %n, 0 ; <i1> [#uses=1]
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br i1 %cmp6, label %for.end, label %for.body
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for.body: ; preds = %for.body, %entry
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%i = phi i64 [ %i.next, %for.body ], [ 0, %entry ] ; <i64> [#uses=2]
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%arrayidx = getelementptr double* %p, i64 %i ; <double*> [#uses=2]
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%t4 = load double* %arrayidx ; <double> [#uses=1]
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%mul = fmul double %t4, 2.200000e+00 ; <double> [#uses=1]
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store double %mul, double* %arrayidx
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%i.next = add nsw i64 %i, 1 ; <i64> [#uses=2]
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%cmp = icmp sgt i64 %i.next, %n ; <i1> [#uses=1]
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br i1 %cmp, label %for.end, label %for.body
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for.end: ; preds = %for.body, %entry
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ret void
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}
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