llvm/test/Transforms/InstCombine/shift-shift.ll


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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s

; This would crash if we didn't check for a negative shift.

define void @pr12967() {
; CHECK-LABEL: @pr12967(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label %loop
; CHECK:       loop:
; CHECK-NEXT:    br label %loop
;
entry:
  br label %loop

loop:
  %c = phi i32 [ %shl, %loop ], [ undef, %entry ]
  %shr = shl i32 %c, 7
  %shl = lshr i32 %shr, -2
  br label %loop
}