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5e6887dc27
ScalarEvolution::isKnownPredicate() can wrongly reduce a comparison when both the LHS and RHS are SCEVAddRecExprs. This checks that both LHS and RHS are guarded in the case when both are SCEVAddRecExprs. The test case is against indvars because I could not find a way to directly test SCEV. Patch by Sanjay Patel! llvm-svn: 209487
31 lines
718 B
LLVM
31 lines
718 B
LLVM
; RUN: opt -indvars -S < %s | FileCheck %s
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; indvars should transform the phi node pair from the for-loop
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; CHECK-LABEL: @main(
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; CHECK: ret = phi i32 [ 0, %entry ], [ 0, {{.*}} ]
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@c = common global i32 0, align 4
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define i32 @main() #0 {
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entry:
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%0 = load i32* @c, align 4
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%tobool = icmp eq i32 %0, 0
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br i1 %tobool, label %for.body, label %exit
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for.body:
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%inc2 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
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%sub = add i32 %inc2, -1
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%cmp1 = icmp uge i32 %sub, %inc2
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%conv = zext i1 %cmp1 to i32
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br label %for.inc
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for.inc:
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%inc = add nsw i32 %inc2, 1
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%cmp = icmp slt i32 %inc, 5
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br i1 %cmp, label %for.body, label %exit
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exit:
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%ret = phi i32 [ 0, %entry ], [ %conv, %for.inc ]
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ret i32 %ret
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}
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