File: pr56424.ll

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

; This would crash if we didn't check for a negative shift.
; https://github.com/llvm/llvm-project/issues/56424
define i64 @PR56424(i1 %cond, i32 %arg) {
; CHECK-LABEL: @PR56424(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
; CHECK:       if.then:
; CHECK-NEXT:    br label [[IF_END]]
; CHECK:       if.end:
; CHECK-NEXT:    ret i64 0
;
entry:
  br i1 %cond, label %if.then, label %if.end

if.then:
  %shr  = ashr i32 %arg, -2
  %sext = sext i32 %shr to i64
  br label %if.end

if.end:
  %val = phi i64 [ %sext, %if.then ], [ 0, %entry ]
  %and = and i64 -81, %val
  ret i64 %and
}