6ffb3ad631
This avoids false positive verification failures if the condition is not literally true/false, but SCEV still makes use of the fact that a loop is not reachable through more complex reasoning. Fixes https://github.com/llvm/llvm-project/issues/54434.
46 lines
1.5 KiB
LLVM
46 lines
1.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -indvars -verify-scev < %s | FileCheck %s
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define void @test() {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[FOR_COND:%.*]]
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; CHECK: for.cond:
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; CHECK-NEXT: br i1 false, label [[FOR_COND92_PREHEADER:%.*]], label [[FOR_END106:%.*]]
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; CHECK: for.cond92.preheader:
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; CHECK-NEXT: br label [[FOR_COND92:%.*]]
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; CHECK: for.cond92:
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; CHECK-NEXT: br i1 false, label [[FOR_BODY94:%.*]], label [[FOR_END:%.*]]
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; CHECK: for.body94:
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; CHECK-NEXT: br label [[FOR_COND92]]
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; CHECK: for.end:
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; CHECK-NEXT: br label [[FOR_COND]]
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; CHECK: for.end106:
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; CHECK-NEXT: ret void
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;
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entry:
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br label %for.cond
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for.cond: ; preds = %for.end, %entry
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%0 = phi i32 [ %inc105, %for.end ], [ 0, %entry ]
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%cmp = icmp sge i32 %0, 1
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br i1 %cmp, label %for.cond92, label %for.end106
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for.cond92: ; preds = %for.body94, %for.cond
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%1 = phi i16 [ %inc, %for.body94 ], [ 0, %for.cond ]
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%cmp93 = icmp slt i16 %1, 1
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br i1 %cmp93, label %for.body94, label %for.end
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for.body94: ; preds = %for.cond92
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%inc = add nsw i16 %1, 1
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br label %for.cond92
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for.end: ; preds = %for.cond92
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%inc105 = add nsw i32 %0, 1
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br label %for.cond
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for.end106: ; preds = %for.cond
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ret void
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}
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