test/Transforms/LoopStrengthReduce/X86/missing-phi-operand-update.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
; PR41445: This test checks the case when LSR split critical edge
; and phi node has other pending fixup operands

; RUN: opt -S -loop-reduce < %s | FileCheck %s

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; We have %indvars.iv.lcssa phi node where 4 input operands
; need to be rewritten: %tmp1, %tmp2, %tmp3, %tmp4.
; When we try to rewrite %tmp1, we first split the critical edge.
; All the other PHI inputs besides %tmp1 go to a new phi node.
; This test checks that LSR is still able to rewrite %tmp2, %tmp3, %tmp4.
define i32 @foo(ptr %A, i32 %t) {
; CHECK-LABEL: define i32 @foo(
; CHECK-SAME: ptr [[A:%.*]], i32 [[T:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_32:%.*]]
; CHECK:       loop.exit.loopexitsplitsplitsplit:
; CHECK-NEXT:    [[LSR_IV:%.*]] = phi i64 [ [[LSR_IV1:%.*]], [[IFMERGE_34:%.*]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[LSR_IV]], -1
; CHECK-NEXT:    br label [[LOOP_EXIT_LOOPEXITSPLITSPLIT:%.*]]
; CHECK:       ifmerge.38.loop.exit.loopexitsplitsplit_crit_edge:
; CHECK-NEXT:    [[LSR_IV_LCSSA10:%.*]] = phi i64 [ [[LSR_IV1]], [[IFMERGE_38:%.*]] ]
; CHECK-NEXT:    br label [[LOOP_EXIT_LOOPEXITSPLITSPLIT]]
; CHECK:       loop.exit.loopexitsplitsplit:
; CHECK-NEXT:    [[INDVARS_IV_LCSSA_PH_PH_PH:%.*]] = phi i64 [ [[LSR_IV_LCSSA10]], [[IFMERGE_38_LOOP_EXIT_LOOPEXITSPLITSPLIT_CRIT_EDGE:%.*]] ], [ [[TMP0]], [[LOOP_EXIT_LOOPEXITSPLITSPLITSPLIT:%.*]] ]
; CHECK-NEXT:    br label [[LOOP_EXIT_LOOPEXITSPLIT:%.*]]
; CHECK:       ifmerge.42.loop.exit.loopexitsplit_crit_edge:
; CHECK-NEXT:    [[LSR_IV_LCSSA11:%.*]] = phi i64 [ [[LSR_IV1]], [[IFMERGE_42:%.*]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = add i64 [[LSR_IV_LCSSA11]], 1
; CHECK-NEXT:    br label [[LOOP_EXIT_LOOPEXITSPLIT]]
; CHECK:       loop.exit.loopexitsplit:
; CHECK-NEXT:    [[INDVARS_IV_LCSSA_PH_PH:%.*]] = phi i64 [ [[TMP1]], [[IFMERGE_42_LOOP_EXIT_LOOPEXITSPLIT_CRIT_EDGE:%.*]] ], [ [[INDVARS_IV_LCSSA_PH_PH_PH]], [[LOOP_EXIT_LOOPEXITSPLITSPLIT]] ]
; CHECK-NEXT:    br label [[LOOP_EXIT_LOOPEXIT:%.*]]
; CHECK:       then.34.loop.exit.loopexit_crit_edge:
; CHECK-NEXT:    [[LSR_IV_LCSSA:%.*]] = phi i64 [ [[LSR_IV1]], [[THEN_34:%.*]] ]
; CHECK-NEXT:    [[TMP2:%.*]] = add i64 [[LSR_IV_LCSSA]], -2
; CHECK-NEXT:    br label [[LOOP_EXIT_LOOPEXIT]]
; CHECK:       loop.exit.loopexit:
; CHECK-NEXT:    [[INDVARS_IV_LCSSA_PH:%.*]] = phi i64 [ [[TMP2]], [[THEN_34_LOOP_EXIT_LOOPEXIT_CRIT_EDGE:%.*]] ], [ [[INDVARS_IV_LCSSA_PH_PH]], [[LOOP_EXIT_LOOPEXITSPLIT]] ]
; CHECK-NEXT:    br label [[LOOP_EXIT:%.*]]
; CHECK:       loop.exit:
; CHECK-NEXT:    [[INDVARS_IV_LCSSA:%.*]] = phi i64 [ 48, [[THEN_8:%.*]] ], [ 49, [[THEN_8_1:%.*]] ], [ [[INDVARS_IV_LCSSA_PH]], [[LOOP_EXIT_LOOPEXIT]] ]
; CHECK-NEXT:    [[TMP:%.*]] = trunc i64 [[INDVARS_IV_LCSSA]] to i32
; CHECK-NEXT:    br label [[FOR_END:%.*]]
; CHECK:       for.end:
; CHECK-NEXT:    [[I_0_LCSSA:%.*]] = phi i32 [ [[TMP]], [[LOOP_EXIT]] ], [ 50, [[THEN_8_1]] ], [ 50, [[IFMERGE_8:%.*]] ]
; CHECK-NEXT:    ret i32 [[I_0_LCSSA]]
; CHECK:       loop.32:
; CHECK-NEXT:    [[LSR_IV1]] = phi i64 [ [[LSR_IV_NEXT:%.*]], [[IFMERGE_46:%.*]] ], [ 2, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[I1_I64_0:%.*]] = phi i64 [ 0, [[ENTRY]] ], [ [[NEXTIVLOOP_32:%.*]], [[IFMERGE_46]] ]
; CHECK-NEXT:    [[TMP3:%.*]] = shl nuw nsw i64 [[LSR_IV1]], 2
; CHECK-NEXT:    [[SCEVGEP7:%.*]] = getelementptr i8, ptr [[A]], i64 [[TMP3]]
; CHECK-NEXT:    [[SCEVGEP8:%.*]] = getelementptr i8, ptr [[SCEVGEP7]], i64 -4
; CHECK-NEXT:    [[GEPLOAD:%.*]] = load i32, ptr [[SCEVGEP8]], align 4
; CHECK-NEXT:    [[CMP_34:%.*]] = icmp sgt i32 [[GEPLOAD]], [[T]]
; CHECK-NEXT:    br i1 [[CMP_34]], label [[THEN_34]], label [[IFMERGE_34]]
; CHECK:       then.34:
; CHECK-NEXT:    [[TMP4:%.*]] = shl nuw nsw i64 [[LSR_IV1]], 2
; CHECK-NEXT:    [[SCEVGEP5:%.*]] = getelementptr i8, ptr [[A]], i64 [[TMP4]]
; CHECK-NEXT:    [[SCEVGEP6:%.*]] = getelementptr i8, ptr [[SCEVGEP5]], i64 -8
; CHECK-NEXT:    [[GEPLOAD18:%.*]] = load i32, ptr [[SCEVGEP6]], align 4
; CHECK-NEXT:    [[CMP_35:%.*]] = icmp slt i32 [[GEPLOAD18]], [[T]]
; CHECK-NEXT:    br i1 [[CMP_35]], label [[THEN_34_LOOP_EXIT_LOOPEXIT_CRIT_EDGE]], label [[IFMERGE_34]]
; CHECK:       ifmerge.34:
; CHECK-NEXT:    [[TMP5:%.*]] = shl nuw nsw i64 [[LSR_IV1]], 2
; CHECK-NEXT:    [[SCEVGEP4:%.*]] = getelementptr i8, ptr [[A]], i64 [[TMP5]]
; CHECK-NEXT:    [[GEPLOAD20:%.*]] = load i32, ptr [[SCEVGEP4]], align 4
; CHECK-NEXT:    [[CMP_38:%.*]] = icmp sgt i32 [[GEPLOAD20]], [[T]]
; CHECK-NEXT:    [[CMP_39:%.*]] = icmp slt i32 [[GEPLOAD]], [[T]]
; CHECK-NEXT:    [[OR_COND:%.*]] = and i1 [[CMP_38]], [[CMP_39]]
; CHECK-NEXT:    br i1 [[OR_COND]], label [[LOOP_EXIT_LOOPEXITSPLITSPLITSPLIT]], label [[IFMERGE_38]]
; CHECK:       ifmerge.38:
; CHECK-NEXT:    [[TMP6:%.*]] = shl nuw nsw i64 [[LSR_IV1]], 2
; CHECK-NEXT:    [[SCEVGEP2:%.*]] = getelementptr i8, ptr [[A]], i64 [[TMP6]]
; CHECK-NEXT:    [[SCEVGEP3:%.*]] = getelementptr i8, ptr [[SCEVGEP2]], i64 4
; CHECK-NEXT:    [[GEPLOAD24:%.*]] = load i32, ptr [[SCEVGEP3]], align 4
; CHECK-NEXT:    [[CMP_42:%.*]] = icmp sgt i32 [[GEPLOAD24]], [[T]]
; CHECK-NEXT:    [[CMP_43:%.*]] = icmp slt i32 [[GEPLOAD20]], [[T]]
; CHECK-NEXT:    [[OR_COND55:%.*]] = and i1 [[CMP_42]], [[CMP_43]]
; CHECK-NEXT:    br i1 [[OR_COND55]], label [[IFMERGE_38_LOOP_EXIT_LOOPEXITSPLITSPLIT_CRIT_EDGE]], label [[IFMERGE_42]]
; CHECK:       ifmerge.42:
; CHECK-NEXT:    [[TMP7:%.*]] = shl nuw nsw i64 [[LSR_IV1]], 2
; CHECK-NEXT:    [[SCEVGEP:%.*]] = getelementptr i8, ptr [[A]], i64 [[TMP7]]
; CHECK-NEXT:    [[SCEVGEP1:%.*]] = getelementptr i8, ptr [[SCEVGEP]], i64 8
; CHECK-NEXT:    [[GEPLOAD28:%.*]] = load i32, ptr [[SCEVGEP1]], align 4
; CHECK-NEXT:    [[CMP_46:%.*]] = icmp sgt i32 [[GEPLOAD28]], [[T]]
; CHECK-NEXT:    [[CMP_47:%.*]] = icmp slt i32 [[GEPLOAD24]], [[T]]
; CHECK-NEXT:    [[OR_COND56:%.*]] = and i1 [[CMP_46]], [[CMP_47]]
; CHECK-NEXT:    br i1 [[OR_COND56]], label [[IFMERGE_42_LOOP_EXIT_LOOPEXITSPLIT_CRIT_EDGE]], label [[IFMERGE_46]]
; CHECK:       ifmerge.46:
; CHECK-NEXT:    [[NEXTIVLOOP_32]] = add nuw nsw i64 [[I1_I64_0]], 1
; CHECK-NEXT:    [[LSR_IV_NEXT]] = add nuw nsw i64 [[LSR_IV1]], 4
; CHECK-NEXT:    [[CONDLOOP_32:%.*]] = icmp ult i64 [[NEXTIVLOOP_32]], 12
; CHECK-NEXT:    br i1 [[CONDLOOP_32]], label [[LOOP_32]], label [[LOOP_25:%.*]]
; CHECK:       loop.25:
; CHECK-NEXT:    [[ARRAYIDX31:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 49
; CHECK-NEXT:    [[GEPLOAD32:%.*]] = load i32, ptr [[ARRAYIDX31]], align 4
; CHECK-NEXT:    [[CMP_8:%.*]] = icmp sgt i32 [[GEPLOAD32]], [[T]]
; CHECK-NEXT:    br i1 [[CMP_8]], label [[THEN_8]], label [[IFMERGE_8]]
; CHECK:       then.8:
; CHECK-NEXT:    [[ARRAYIDX33:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 48
; CHECK-NEXT:    [[GEPLOAD34:%.*]] = load i32, ptr [[ARRAYIDX33]], align 4
; CHECK-NEXT:    [[CMP_15:%.*]] = icmp slt i32 [[GEPLOAD34]], [[T]]
; CHECK-NEXT:    br i1 [[CMP_15]], label [[LOOP_EXIT]], label [[IFMERGE_8]]
; CHECK:       ifmerge.8:
; CHECK-NEXT:    [[ARRAYIDX31_1:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 50
; CHECK-NEXT:    [[GEPLOAD32_1:%.*]] = load i32, ptr [[ARRAYIDX31_1]], align 4
; CHECK-NEXT:    [[CMP_8_1:%.*]] = icmp sgt i32 [[GEPLOAD32_1]], [[T]]
; CHECK-NEXT:    br i1 [[CMP_8_1]], label [[THEN_8_1]], label [[FOR_END]]
; CHECK:       then.8.1:
; CHECK-NEXT:    [[ARRAYIDX33_1:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 49
; CHECK-NEXT:    [[GEPLOAD34_1:%.*]] = load i32, ptr [[ARRAYIDX33_1]], align 4
; CHECK-NEXT:    [[CMP_15_1:%.*]] = icmp slt i32 [[GEPLOAD34_1]], [[T]]
; CHECK-NEXT:    br i1 [[CMP_15_1]], label [[LOOP_EXIT]], label [[FOR_END]]
;
entry:
  br label %loop.32

loop.exit:                                        ; preds = %then.8.1, %then.8, %ifmerge.42, %ifmerge.38, %ifmerge.34, %then.34
  %indvars.iv.lcssa = phi i64 [ 48, %then.8 ], [ 49, %then.8.1 ], [ %tmp4, %ifmerge.42 ], [ %tmp3, %ifmerge.38 ], [ %tmp2, %ifmerge.34 ], [ %tmp1, %then.34 ]
  %tmp = trunc i64 %indvars.iv.lcssa to i32
  br label %for.end

for.end:                                          ; preds = %then.8.1, %ifmerge.8, %loop.exit
  %i.0.lcssa = phi i32 [ %tmp, %loop.exit ], [ 50, %then.8.1 ], [ 50, %ifmerge.8 ]
  ret i32 %i.0.lcssa

; shl instruction will be dead eliminated when all it's uses will be rewritten.
loop.32:                                          ; preds = %ifmerge.46, %entry
  %i1.i64.0 = phi i64 [ 0, %entry ], [ %nextivloop.32, %ifmerge.46 ]
  %tmp1 = shl i64 %i1.i64.0, 2
  %tmp2 = or disjoint i64 %tmp1, 1
  %arrayIdx = getelementptr inbounds i32, ptr %A, i64 %tmp2
  %gepload = load i32, ptr %arrayIdx, align 4
  %cmp.34 = icmp sgt i32 %gepload, %t
  br i1 %cmp.34, label %then.34, label %ifmerge.34

then.34:                                          ; preds = %loop.32
  %arrayIdx17 = getelementptr inbounds i32, ptr %A, i64 %tmp1
  %gepload18 = load i32, ptr %arrayIdx17, align 4
  %cmp.35 = icmp slt i32 %gepload18, %t
  br i1 %cmp.35, label %loop.exit, label %ifmerge.34

ifmerge.34:                                       ; preds = %then.34, %loop.32
  %tmp3 = or disjoint i64 %tmp1, 2
  %arrayIdx19 = getelementptr inbounds i32, ptr %A, i64 %tmp3
  %gepload20 = load i32, ptr %arrayIdx19, align 4
  %cmp.38 = icmp sgt i32 %gepload20, %t
  %cmp.39 = icmp slt i32 %gepload, %t
  %or.cond = and i1 %cmp.38, %cmp.39
  br i1 %or.cond, label %loop.exit, label %ifmerge.38

ifmerge.38:                                       ; preds = %ifmerge.34
  %tmp4 = or disjoint i64 %tmp1, 3
  %arrayIdx23 = getelementptr inbounds i32, ptr %A, i64 %tmp4
  %gepload24 = load i32, ptr %arrayIdx23, align 4
  %cmp.42 = icmp sgt i32 %gepload24, %t
  %cmp.43 = icmp slt i32 %gepload20, %t
  %or.cond55 = and i1 %cmp.42, %cmp.43
  br i1 %or.cond55, label %loop.exit, label %ifmerge.42

ifmerge.42:                                       ; preds = %ifmerge.38
  %tmp5 = add i64 %tmp1, 4
  %arrayIdx27 = getelementptr inbounds i32, ptr %A, i64 %tmp5
  %gepload28 = load i32, ptr %arrayIdx27, align 4
  %cmp.46 = icmp sgt i32 %gepload28, %t
  %cmp.47 = icmp slt i32 %gepload24, %t
  %or.cond56 = and i1 %cmp.46, %cmp.47
  br i1 %or.cond56, label %loop.exit, label %ifmerge.46

ifmerge.46:                                       ; preds = %ifmerge.42
  %nextivloop.32 = add nuw nsw i64 %i1.i64.0, 1
  %condloop.32 = icmp ult i64 %nextivloop.32, 12
  br i1 %condloop.32, label %loop.32, label %loop.25

loop.25:                                          ; preds = %ifmerge.46
  %arrayIdx31 = getelementptr inbounds i32, ptr %A, i64 49
  %gepload32 = load i32, ptr %arrayIdx31, align 4
  %cmp.8 = icmp sgt i32 %gepload32, %t
  br i1 %cmp.8, label %then.8, label %ifmerge.8

then.8:                                           ; preds = %loop.25
  %arrayIdx33 = getelementptr inbounds i32, ptr %A, i64 48
  %gepload34 = load i32, ptr %arrayIdx33, align 4
  %cmp.15 = icmp slt i32 %gepload34, %t
  br i1 %cmp.15, label %loop.exit, label %ifmerge.8

ifmerge.8:                                        ; preds = %then.8, %loop.25
  %arrayIdx31.1 = getelementptr inbounds i32, ptr %A, i64 50
  %gepload32.1 = load i32, ptr %arrayIdx31.1, align 4
  %cmp.8.1 = icmp sgt i32 %gepload32.1, %t
  br i1 %cmp.8.1, label %then.8.1, label %for.end

then.8.1:                                         ; preds = %ifmerge.8
  %arrayIdx33.1 = getelementptr inbounds i32, ptr %A, i64 49
  %gepload34.1 = load i32, ptr %arrayIdx33.1, align 4
  %cmp.15.1 = icmp slt i32 %gepload34.1, %t
  br i1 %cmp.15.1, label %loop.exit, label %for.end
}