test/Transforms/NewGVN/eliminate-ssacopy.ll

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

; Make sure the created ssa copies are cleaned up. See PR38804.

; CHECK-NOT: ssa_copy

@b = external dso_local local_unnamed_addr global i32, align 4
@a = external dso_local local_unnamed_addr global i8, align 1
@f = external dso_local local_unnamed_addr global i16, align 2

define void @g() {
; CHECK-LABEL: @g(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 undef, label [[FOR_COND1THREAD_PRE_SPLIT:%.*]], label [[FOR_COND_PREHEADER:%.*]]
; CHECK:       for.cond.preheader:
; CHECK-NEXT:    unreachable
; CHECK:       for.cond1thread-pre-split:
; CHECK-NEXT:    br label [[FOR_END4_SPLIT:%.*]]
; CHECK:       for.end4.split:
; CHECK-NEXT:    br i1 true, label [[FOR_COND6_PREHEADER:%.*]], label [[IF_END11:%.*]]
; CHECK:       for.cond6.preheader:
; CHECK-NEXT:    br i1 undef, label [[FOR_COND6_PREHEADER3:%.*]], label [[IF_END11_LOOPEXIT:%.*]]
; CHECK:       for.cond6.preheader3:
; CHECK-NEXT:    br label [[IF_END11_LOOPEXIT]]
; CHECK:       if.end11.loopexit:
; CHECK-NEXT:    [[STOREMERGE_LCSSA:%.*]] = phi i32 [ 0, [[FOR_COND6_PREHEADER]] ], [ 1, [[FOR_COND6_PREHEADER3]] ]
; CHECK-NEXT:    store i32 [[STOREMERGE_LCSSA]], i32* @b, align 4
; CHECK-NEXT:    br label [[IF_END11]]
; CHECK:       if.end11:
; CHECK-NEXT:    [[TMP0:%.*]] = load i32, i32* @b, align 4
; CHECK-NEXT:    [[TMP1:%.*]] = load i8, i8* @a, align 1
; CHECK-NEXT:    [[CONV:%.*]] = sext i8 [[TMP1]] to i32
; CHECK-NEXT:    [[CMP12:%.*]] = icmp eq i32 [[TMP0]], [[CONV]]
; CHECK-NEXT:    br i1 [[CMP12]], label [[IF_THEN14:%.*]], label [[IF_END16:%.*]]
; CHECK:       if.then14:
; CHECK-NEXT:    [[CONV15:%.*]] = trunc i32 [[TMP0]] to i16
; CHECK-NEXT:    store i16 [[CONV15]], i16* @f, align 2
; CHECK-NEXT:    unreachable
; CHECK:       if.end16:
; CHECK-NEXT:    ret void
;
entry:
  %tobool = icmp eq i32 undef, 0
  br i1 %tobool, label %for.cond1thread-pre-split, label %for.cond.preheader

for.cond.preheader:                               ; preds = %entry
  unreachable

for.cond1thread-pre-split:                        ; preds = %entry
  br label %for.end4.split

for.end4.split:                                   ; preds = %for.cond1thread-pre-split
  br i1 %tobool, label %for.cond6.preheader, label %if.end11

for.cond6.preheader:                              ; preds = %for.end4.split
  br i1 undef, label %for.cond6.preheader3, label %if.end11.loopexit

for.cond6.preheader3:                             ; preds = %for.cond6.preheader
  br label %if.end11.loopexit

if.end11.loopexit:                                ; preds = %for.cond6.preheader3, %for.cond6.preheader
  %storemerge.lcssa = phi i32 [ 0, %for.cond6.preheader ], [ 1, %for.cond6.preheader3 ]
  store i32 %storemerge.lcssa, i32* @b, align 4
  br label %if.end11

if.end11:                                         ; preds = %if.end11.loopexit, %for.end4.split
  %0 = load i32, i32* @b, align 4
  %1 = load i8, i8* @a, align 1
  %conv = sext i8 %1 to i32
  %cmp12 = icmp eq i32 %0, %conv
  br i1 %cmp12, label %if.then14, label %if.end16

if.then14:                                        ; preds = %if.end11
  %conv15 = trunc i32 %0 to i16
  store i16 %conv15, i16* @f, align 2
  unreachable

if.end16:                                         ; preds = %if.end11
  ret void
}