d14acb7806
`WidenIV::widenWithVariantUse` assumes that exactly one of the binop operands is the IV to be widened. This miscompilation happens when it tries to sign-extend the "NonIV" operand while the IV is zero-extended. Closes https://github.com/llvm/llvm-project/issues/135182.
28 lines
828 B
LLVM
28 lines
828 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -S -passes=indvars < %s | FileCheck %s
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
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define i32 @pr135182() {
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; CHECK-LABEL: define i32 @pr135182() {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: br label %[[FOR_BODY:.*]]
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; CHECK: [[FOR_BODY]]:
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; CHECK-NEXT: br i1 false, label %[[FOR_BODY]], label %[[FOR_END:.*]]
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; CHECK: [[FOR_END]]:
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; CHECK-NEXT: ret i32 65512
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;
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entry:
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br label %for.body
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for.body:
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%indvar = phi i16 [ -12, %entry ], [ %indvar.next, %for.body ]
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%add = add i16 %indvar, %indvar
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%ext = zext i16 %add to i32
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%indvar.next = add i16 %indvar, 1
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br i1 false, label %for.body, label %for.end
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for.end:
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ret i32 %ext
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}
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