llvm/test/Transforms/JumpThreading/pr62908.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
; RUN: opt -S -passes=jump-threading < %s | FileCheck %s

; Make sure this does not crash due to conflicting known bits.

define i32 @test() {
; CHECK-LABEL: define i32 @test() {
; CHECK-NEXT:  join.thread:
; CHECK-NEXT:    br label [[END:%.*]]
; CHECK:       unreachable:
; CHECK-NEXT:    [[SH_PROM:%.*]] = zext i32 -1 to i64
; CHECK-NEXT:    [[SHL:%.*]] = shl nsw i64 -1, [[SH_PROM]]
; CHECK-NEXT:    [[CONV:%.*]] = trunc i64 [[SHL]] to i32
; CHECK-NEXT:    br label [[JOIN:%.*]]
; CHECK:       join:
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ [[CONV]], [[UNREACHABLE:%.*]] ]
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[PHI]], 0
; CHECK-NEXT:    br i1 [[CMP]], label [[END]], label [[END]]
; CHECK:       end:
; CHECK-NEXT:    ret i32 0
;
entry:
  br label %join

unreachable:
  %sh_prom = zext i32 -1 to i64
  %shl = shl nsw i64 -1, %sh_prom
  %conv = trunc i64 %shl to i32
  br label %join

join:
  %phi = phi i32 [ %conv, %unreachable ], [ 0, %entry ]
  %cmp = icmp eq i32 %phi, 0
  br i1 %cmp, label %end, label %if

if:
  br label %end

end:
  ret i32 0
}