llvm/test/Analysis/ValueTracking/knownbits-phi-deadcode.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
; RUN: opt -passes=loop-deletion -S < %s | FileCheck %s
; This reduced testcase from pr65022. We are only testing that is doesn't crash.

define void @f(i32 %spec.select) {
; CHECK-LABEL: define void @f
; CHECK-SAME: (i32 [[SPEC_SELECT:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[L_OUTER:%.*]]
; CHECK:       L.outer:
; CHECK-NEXT:    br label [[IF_END:%.*]]
; CHECK:       if.end:
; CHECK-NEXT:    [[DOTB:%.*]] = load i1, ptr null, align 1
; CHECK-NEXT:    [[TMP0:%.*]] = select i1 [[DOTB]], i32 0, i32 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[TMP0]], -1
; CHECK-NEXT:    br i1 [[CMP]], label [[IF_THEN3:%.*]], label [[WHILE_COND_SPLIT_LOOP_EXIT1:%.*]]
; CHECK:       if.then3:
; CHECK-NEXT:    br label [[IF_END]]
; CHECK:       while.cond.split.loop.exit1:
; CHECK-NEXT:    [[DOTLCSSA:%.*]] = phi i32 [ [[TMP0]], [[IF_END]] ]
; CHECK-NEXT:    [[NOT_LE:%.*]] = xor i32 [[DOTLCSSA]], 1
; CHECK-NEXT:    [[TOBOOL7_NOT:%.*]] = icmp eq i32 [[NOT_LE]], 0
; CHECK-NEXT:    [[SPEC_SELECT3:%.*]] = select i1 [[TOBOOL7_NOT]], i32 0, i32 [[SPEC_SELECT]]
; CHECK-NEXT:    [[TOBOOL10_NOT:%.*]] = icmp eq i32 [[SPEC_SELECT3]], 0
; CHECK-NEXT:    br i1 [[TOBOOL10_NOT]], label [[FOR_COND_PREHEADER:%.*]], label [[L_OUTER]]
; CHECK:       for.cond.preheader:
; CHECK-NEXT:    ret void
;
entry:
  br label %L.outer

L.outer:                                          ; preds = %while.cond.split.loop.exit1, %entry
  br label %if.end

if.end:                                           ; preds = %if.then3, %L.outer
  %.b = load i1, ptr null, align 1
  %0 = select i1 %.b, i32 0, i32 1
  %cmp = icmp sgt i32 %0, -1
  br i1 %cmp, label %if.then3, label %while.cond.split.loop.exit1

if.then3:                                         ; preds = %if.end
  br label %if.end

while.cond.split.loop.exit1:                      ; preds = %if.end
  %.lcssa = phi i32 [ %0, %if.end ]
  %not.le = xor i32 %.lcssa, 1
  %tobool7.not = icmp eq i32 %not.le, 0
  %spec.select3 = select i1 %tobool7.not, i32 0, i32 %spec.select
  %tobool10.not = icmp eq i32 %spec.select3, 0
  br i1 %tobool10.not, label %for.cond.preheader, label %L.outer

for.cond.preheader:                               ; preds = %while.cond.split.loop.exit1
  ret void
}

; uselistorder directives
uselistorder i32 0, { 1, 0, 2, 3 }