llvm/test/Transforms/JumpThreading/pr79175.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
; RUN: opt -S -passes=jump-threading < %s | FileCheck %s

@f = external global i32

; Make sure the value of @f is reloaded prior to the final comparison.
define i32 @test(i64 %idx, i32 %val) {
; CHECK-LABEL: define i32 @test(
; CHECK-SAME: i64 [[IDX:%.*]], i32 [[VAL:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i64 [[IDX]], 1
; CHECK-NEXT:    br i1 [[CMP]], label [[FOR_BODY:%.*]], label [[RETURN:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[F:%.*]] = load i32, ptr @f, align 4
; CHECK-NEXT:    [[CMP1:%.*]] = icmp eq i32 [[F]], 0
; CHECK-NEXT:    br i1 [[CMP1]], label [[COND_END_THREAD:%.*]], label [[COND_END:%.*]]
; CHECK:       cond.end:
; CHECK-NEXT:    [[CMP_I:%.*]] = icmp sgt i32 [[VAL]], 0
; CHECK-NEXT:    [[COND_FR:%.*]] = freeze i1 [[CMP_I]]
; CHECK-NEXT:    br i1 [[COND_FR]], label [[COND_END_THREAD]], label [[TMP0:%.*]]
; CHECK:       cond.end.thread:
; CHECK-NEXT:    br label [[TMP0]]
; CHECK:       0:
; CHECK-NEXT:    [[TMP1:%.*]] = phi i32 [ 0, [[COND_END_THREAD]] ], [ [[VAL]], [[COND_END]] ]
; CHECK-NEXT:    [[F_IDX:%.*]] = getelementptr inbounds i32, ptr @f, i64 [[IDX]]
; CHECK-NEXT:    store i32 [[TMP1]], ptr [[F_IDX]], align 4
; CHECK-NEXT:    [[F_RELOAD:%.*]] = load i32, ptr @f, align 4
; CHECK-NEXT:    [[CMP3:%.*]] = icmp slt i32 [[F_RELOAD]], 1
; CHECK-NEXT:    br i1 [[CMP3]], label [[RETURN2:%.*]], label [[RETURN]]
; CHECK:       return:
; CHECK-NEXT:    ret i32 0
; CHECK:       return2:
; CHECK-NEXT:    ret i32 1
;
entry:
  %cmp = icmp slt i64 %idx, 1
  br i1 %cmp, label %for.body, label %return

for.body:
  %f = load i32, ptr @f, align 4
  %cmp1 = icmp eq i32 %f, 0
  br i1 %cmp1, label %cond.end, label %cond.false

cond.false:
  br label %cond.end

cond.end:
  %phi = phi i32 [ %val, %cond.false ], [ 1, %for.body ]
  %cmp.i = icmp sgt i32 %phi, 0
  %sel = select i1 %cmp.i, i32 0, i32 %phi
  %f.idx = getelementptr inbounds i32, ptr @f, i64 %idx
  store i32 %sel, ptr %f.idx, align 4
  %f.reload = load i32, ptr @f, align 4
  %cmp3 = icmp slt i32 %f.reload, 1
  br i1 %cmp3, label %return2, label %return

return:
  ret i32 0

return2:
  ret i32 1
}