llvm/test/Transforms/LoopInterchange/pr57148.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=loop-interchange -cache-line-size=4 -loop-interchange-threshold=-100 -verify-dom-info -verify-loop-info -verify-scev -verify-loop-lcssa -S | FileCheck %s

; Make sure the loops are in LCSSA form after loop interchange,
; and loop interchange does not hit assertion errors and crash.

target triple = "x86_64-unknown-linux-gnu"

@b = external global [512 x [4 x i32]], align 1
@c = external global [2 x [4 x i32]], align 1

define void @test1() {
; CHECK-LABEL: @test1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_COND37_PREHEADER_PREHEADER:%.*]]
; CHECK:       for.cond33.preheader.preheader:
; CHECK-NEXT:    br label [[FOR_COND33_PREHEADER:%.*]]
; CHECK:       for.cond33.preheader:
; CHECK-NEXT:    [[I_011:%.*]] = phi i16 [ [[INC69:%.*]], [[FOR_END67:%.*]] ], [ 0, [[FOR_COND33_PREHEADER_PREHEADER:%.*]] ]
; CHECK-NEXT:    br label [[FOR_BODY42_SPLIT1:%.*]]
; CHECK:       for.body42.preheader:
; CHECK-NEXT:    br label [[FOR_BODY42:%.*]]
; CHECK:       for.cond37.preheader.preheader:
; CHECK-NEXT:    br label [[FOR_COND37_PREHEADER:%.*]]
; CHECK:       for.cond37.preheader:
; CHECK-NEXT:    [[J_010:%.*]] = phi i16 [ [[INC66:%.*]], [[FOR_END64:%.*]] ], [ 0, [[FOR_COND37_PREHEADER_PREHEADER]] ]
; CHECK-NEXT:    br label [[FOR_BODY42_PREHEADER:%.*]]
; CHECK:       for.body42:
; CHECK-NEXT:    [[K_09:%.*]] = phi i16 [ [[TMP1:%.*]], [[FOR_BODY42_SPLIT:%.*]] ], [ -512, [[FOR_BODY42_PREHEADER]] ]
; CHECK-NEXT:    br label [[FOR_COND33_PREHEADER_PREHEADER]]
; CHECK:       for.body42.split1:
; CHECK-NEXT:    [[SUB51:%.*]] = add nsw i16 [[K_09]], 512
; CHECK-NEXT:    [[ARRAYIDX55:%.*]] = getelementptr inbounds [512 x [4 x i32]], ptr @b, i16 0, i16 [[SUB51]], i16 [[J_010]]
; CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr [[ARRAYIDX55]], align 1
; CHECK-NEXT:    [[ADD61:%.*]] = add i32 undef, undef
; CHECK-NEXT:    [[INC63:%.*]] = add nsw i16 [[K_09]], 1
; CHECK-NEXT:    br label [[FOR_END67]]
; CHECK:       for.body42.split:
; CHECK-NEXT:    [[ADD61_LCSSA:%.*]] = phi i32 [ [[ADD61]], [[FOR_END67]] ]
; CHECK-NEXT:    [[TMP1]] = add nsw i16 [[K_09]], 1
; CHECK-NEXT:    br i1 true, label [[FOR_END64]], label [[FOR_BODY42]]
; CHECK:       for.end64:
; CHECK-NEXT:    [[ADD61_LCSSA_LCSSA:%.*]] = phi i32 [ [[ADD61_LCSSA]], [[FOR_BODY42_SPLIT]] ]
; CHECK-NEXT:    store i32 [[ADD61_LCSSA_LCSSA]], ptr undef, align 1
; CHECK-NEXT:    [[INC66]] = add nuw nsw i16 [[J_010]], 1
; CHECK-NEXT:    br i1 true, label [[FOR_COND75_PREHEADER:%.*]], label [[FOR_COND37_PREHEADER]]
; CHECK:       for.end67:
; CHECK-NEXT:    [[INC69]] = add nuw nsw i16 [[I_011]], 1
; CHECK-NEXT:    [[EXITCOND13_NOT:%.*]] = icmp eq i16 [[INC69]], 2
; CHECK-NEXT:    br i1 [[EXITCOND13_NOT]], label [[FOR_BODY42_SPLIT]], label [[FOR_COND33_PREHEADER]]
; CHECK:       for.cond75.preheader:
; CHECK-NEXT:    br label [[FOR_COND75:%.*]]
; CHECK:       for.cond75:
; CHECK-NEXT:    br label [[FOR_COND75]]
;
entry:
  br label %for.cond33.preheader

for.cond33.preheader:                             ; preds = %for.end67, %entry
  %i.011 = phi i16 [ 0, %entry ], [ %inc69, %for.end67 ]
  br label %for.cond37.preheader

for.cond37.preheader:                             ; preds = %for.end64, %for.cond33.preheader
  %j.010 = phi i16 [ 0, %for.cond33.preheader ], [ %inc66, %for.end64 ]
  br label %for.body42

for.body42:                                       ; preds = %for.body42, %for.cond37.preheader
  %k.09 = phi i16 [ -512, %for.cond37.preheader ], [ %inc63, %for.body42 ]
  %sub51 = add nsw i16 %k.09, 512
  %arrayidx55 = getelementptr inbounds [512 x [4 x i32]], ptr @b, i16 0, i16 %sub51, i16 %j.010
  %0 = load i32, ptr %arrayidx55, align 1
  %add61 = add i32 undef, undef
  %inc63 = add nsw i16 %k.09, 1
  br i1 true, label %for.end64, label %for.body42

for.end64:                                        ; preds = %for.body42
  store i32 %add61, ptr undef, align 1
  %inc66 = add nuw nsw i16 %j.010, 1
  br i1 true, label %for.end67, label %for.cond37.preheader

for.end67:                                        ; preds = %for.end64
  %inc69 = add nuw nsw i16 %i.011, 1
  %exitcond13.not = icmp eq i16 %inc69, 2
  br i1 %exitcond13.not, label %for.cond75, label %for.cond33.preheader

for.cond75:                                       ; preds = %for.cond75, %for.end67
  br label %for.cond75
}


; Make sure that we split the phi nodes in the middle loop header
; into a separate basic block to avoid the situation where use of
; the outermost indvar appears before its def after interchanging
; the outermost and the middle loop. Otherwise loop interchange
; would crash.

define void @test2() {
; CHECK-LABEL: @test2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_COND37_PREHEADER_PREHEADER:%.*]]
; CHECK:       for.cond33.preheader.preheader:
; CHECK-NEXT:    br label [[FOR_COND33_PREHEADER:%.*]]
; CHECK:       for.cond33.preheader:
; CHECK-NEXT:    [[I_166:%.*]] = phi i16 [ [[INC69:%.*]], [[FOR_INC68:%.*]] ], [ 0, [[FOR_COND33_PREHEADER_PREHEADER:%.*]] ]
; CHECK-NEXT:    [[ARRAYIDX60:%.*]] = getelementptr inbounds [2 x [4 x i32]], ptr @c, i16 0, i16 [[I_166]], i16 [[J_165:%.*]]
; CHECK-NEXT:    br label [[VECTOR_BODY85_SPLIT1:%.*]]
; CHECK:       for.cond37.preheader.preheader:
; CHECK-NEXT:    br label [[FOR_COND37_PREHEADER:%.*]]
; CHECK:       for.cond37.preheader:
; CHECK-NEXT:    [[J_165]] = phi i16 [ [[INC66:%.*]], [[MIDDLE_BLOCK80:%.*]] ], [ 0, [[FOR_COND37_PREHEADER_PREHEADER]] ]
; CHECK-NEXT:    br label [[FOR_COND37_PREHEADER_SPLIT:%.*]]
; CHECK:       for.cond37.preheader.split:
; CHECK-NEXT:    br label [[VECTOR_BODY85:%.*]]
; CHECK:       vector.body85:
; CHECK-NEXT:    [[INDEX86:%.*]] = phi i16 [ 0, [[FOR_COND37_PREHEADER_SPLIT]] ], [ [[TMP3:%.*]], [[VECTOR_BODY85_SPLIT:%.*]] ]
; CHECK-NEXT:    br label [[FOR_COND33_PREHEADER_PREHEADER]]
; CHECK:       vector.body85.split1:
; CHECK-NEXT:    [[TMP0:%.*]] = or i16 [[INDEX86]], 2
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds [512 x [4 x i32]], ptr @b, i16 0, i16 [[TMP0]], i16 [[J_165]]
; CHECK-NEXT:    [[TMP2:%.*]] = load i32, ptr [[TMP1]], align 1
; CHECK-NEXT:    [[INDEX_NEXT87:%.*]] = add nuw i16 [[INDEX86]], 4
; CHECK-NEXT:    br label [[FOR_INC68]]
; CHECK:       vector.body85.split:
; CHECK-NEXT:    [[TMP3]] = add nuw i16 [[INDEX86]], 4
; CHECK-NEXT:    br i1 true, label [[MIDDLE_BLOCK80]], label [[VECTOR_BODY85]]
; CHECK:       middle.block80:
; CHECK-NEXT:    [[INC66]] = add nuw nsw i16 [[J_165]], 1
; CHECK-NEXT:    br i1 true, label [[FOR_COND75_PREHEADER:%.*]], label [[FOR_COND37_PREHEADER]]
; CHECK:       for.inc68:
; CHECK-NEXT:    [[INC69]] = add nuw nsw i16 [[I_166]], 1
; CHECK-NEXT:    [[EXITCOND77_NOT:%.*]] = icmp eq i16 [[INC69]], 2
; CHECK-NEXT:    br i1 [[EXITCOND77_NOT]], label [[VECTOR_BODY85_SPLIT]], label [[FOR_COND33_PREHEADER]]
; CHECK:       for.cond75.preheader:
; CHECK-NEXT:    unreachable
;
entry:
  br label %for.cond33.preheader

for.cond33.preheader:                             ; preds = %for.inc68, %entry
  %i.166 = phi i16 [ %inc69, %for.inc68 ], [ 0, %entry ]
  br label %for.cond37.preheader

for.cond37.preheader:                             ; preds = %middle.block80, %for.cond33.preheader
  %j.165 = phi i16 [ 0, %for.cond33.preheader ], [ %inc66, %middle.block80 ]
  %arrayidx60 = getelementptr inbounds [2 x [4 x i32]], ptr @c, i16 0, i16 %i.166, i16 %j.165
  br label %vector.body85

vector.body85:                                    ; preds = %vector.body85, %for.cond37.preheader
  %index86 = phi i16 [ 0, %for.cond37.preheader ], [ %index.next87, %vector.body85 ]
  %0 = or i16 %index86, 2
  %1 = getelementptr inbounds [512 x [4 x i32]], ptr @b, i16 0, i16 %0, i16 %j.165
  %2 = load i32, ptr %1, align 1
  %index.next87 = add nuw i16 %index86, 4
  br i1 undef, label %middle.block80, label %vector.body85

middle.block80:                                   ; preds = %vector.body85
  %inc66 = add nuw nsw i16 %j.165, 1
  br i1 undef, label %for.inc68, label %for.cond37.preheader

for.inc68:                                        ; preds = %middle.block80
  %inc69 = add nuw nsw i16 %i.166, 1
  %exitcond77.not = icmp eq i16 %inc69, 2
  br i1 %exitcond77.not, label %for.cond75.preheader, label %for.cond33.preheader

for.cond75.preheader:                             ; preds = %for.inc68
  unreachable
}