llvm/test/Transforms/LoopVectorize/trunc-reductions.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=loop-vectorize,dce,instcombine -force-vector-interleave=1 -force-vector-width=8 -S < %s | FileCheck %s

define i8 @reduction_and_trunc(ptr noalias nocapture %ptr) {
; CHECK-LABEL: @reduction_and_trunc(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VEC_PHI:%.*]] = phi <8 x i8> [ <i8 0, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>, [[VECTOR_PH]] ], [ [[TMP2:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[INDEX]] to i64
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[PTR:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <8 x i8>, ptr [[TMP1]], align 1
; CHECK-NEXT:    [[TMP2]] = and <8 x i8> [[VEC_PHI]], [[WIDE_LOAD]]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 8
; CHECK-NEXT:    [[TMP3:%.*]] = icmp eq i32 [[INDEX_NEXT]], 256
; CHECK-NEXT:    br i1 [[TMP3]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       middle.block:
; CHECK-NEXT:    [[TMP4:%.*]] = call i8 @llvm.vector.reduce.and.v8i8(<8 x i8> [[TMP2]])
; CHECK-NEXT:    br i1 true, label [[FOR_END:%.*]], label [[SCALAR_PH]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    br i1 poison, label [[FOR_END]], label [[FOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK:       for.end:
; CHECK-NEXT:    [[AND_LCSSA_OFF0:%.*]] = phi i8 [ poison, [[FOR_BODY]] ], [ [[TMP4]], [[MIDDLE_BLOCK]] ]
; CHECK-NEXT:    ret i8 [[AND_LCSSA_OFF0]]
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %sum.02p = phi i32 [ %and, %for.body ], [ 0, %entry ]
  %sum.02 = and i32 %sum.02p, 255
  %gep = getelementptr inbounds i8, ptr %ptr, i32 %iv
  %load = load i8, ptr %gep
  %ext = zext i8 %load to i32
  %and = and i32 %sum.02, %ext
  %iv.next = add i32 %iv, 1
  %exitcond = icmp eq i32 %iv.next, 256
  br i1 %exitcond, label %for.end, label %for.body

for.end:
  %ret = trunc i32 %and to i8
  ret i8 %ret
}

define i16 @reduction_or_trunc(ptr noalias nocapture %ptr) {
; CHECK-LABEL: @reduction_or_trunc(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VEC_PHI:%.*]] = phi <8 x i16> [ zeroinitializer, [[VECTOR_PH]] ], [ [[TMP2:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[INDEX]] to i64
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i16, ptr [[PTR:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <8 x i16>, ptr [[TMP1]], align 2
; CHECK-NEXT:    [[TMP2]] = or <8 x i16> [[VEC_PHI]], [[WIDE_LOAD]]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 8
; CHECK-NEXT:    [[TMP3:%.*]] = icmp eq i32 [[INDEX_NEXT]], 256
; CHECK-NEXT:    br i1 [[TMP3]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK:       middle.block:
; CHECK-NEXT:    [[TMP4:%.*]] = call i16 @llvm.vector.reduce.or.v8i16(<8 x i16> [[TMP2]])
; CHECK-NEXT:    br i1 true, label [[FOR_END:%.*]], label [[SCALAR_PH]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    br i1 poison, label [[FOR_END]], label [[FOR_BODY]], !llvm.loop [[LOOP5:![0-9]+]]
; CHECK:       for.end:
; CHECK-NEXT:    [[XOR_LCSSA_OFF0:%.*]] = phi i16 [ poison, [[FOR_BODY]] ], [ [[TMP4]], [[MIDDLE_BLOCK]] ]
; CHECK-NEXT:    ret i16 [[XOR_LCSSA_OFF0]]
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %sum.02p = phi i32 [ %xor, %for.body ], [ 0, %entry ]
  %sum.02 = and i32 %sum.02p, 65535
  %gep = getelementptr inbounds i16, ptr %ptr, i32 %iv
  %load = load i16, ptr %gep
  %ext = zext i16 %load to i32
  %xor = or i32 %sum.02, %ext
  %iv.next = add i32 %iv, 1
  %exitcond = icmp eq i32 %iv.next, 256
  br i1 %exitcond, label %for.end, label %for.body

for.end:
  %ret = trunc i32 %xor to i16
  ret i16 %ret
}

define i16 @reduction_xor_trunc(ptr noalias nocapture %ptr) {
; CHECK-LABEL: @reduction_xor_trunc(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VEC_PHI:%.*]] = phi <8 x i16> [ zeroinitializer, [[VECTOR_PH]] ], [ [[TMP2:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[INDEX]] to i64
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i16, ptr [[PTR:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <8 x i16>, ptr [[TMP1]], align 2
; CHECK-NEXT:    [[TMP2]] = xor <8 x i16> [[VEC_PHI]], [[WIDE_LOAD]]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 8
; CHECK-NEXT:    [[TMP3:%.*]] = icmp eq i32 [[INDEX_NEXT]], 256
; CHECK-NEXT:    br i1 [[TMP3]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]]
; CHECK:       middle.block:
; CHECK-NEXT:    [[TMP4:%.*]] = call i16 @llvm.vector.reduce.xor.v8i16(<8 x i16> [[TMP2]])
; CHECK-NEXT:    br i1 true, label [[FOR_END:%.*]], label [[SCALAR_PH]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    br i1 poison, label [[FOR_END]], label [[FOR_BODY]], !llvm.loop [[LOOP7:![0-9]+]]
; CHECK:       for.end:
; CHECK-NEXT:    [[XOR_LCSSA_OFF0:%.*]] = phi i16 [ poison, [[FOR_BODY]] ], [ [[TMP4]], [[MIDDLE_BLOCK]] ]
; CHECK-NEXT:    ret i16 [[XOR_LCSSA_OFF0]]
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %sum.02p = phi i32 [ %xor, %for.body ], [ 0, %entry ]
  %sum.02 = and i32 %sum.02p, 65535
  %gep = getelementptr inbounds i16, ptr %ptr, i32 %iv
  %load = load i16, ptr %gep
  %ext = zext i16 %load to i32
  %xor = xor i32 %sum.02, %ext
  %iv.next = add i32 %iv, 1
  %exitcond = icmp eq i32 %iv.next, 256
  br i1 %exitcond, label %for.end, label %for.body

for.end:
  %ret = trunc i32 %xor to i16
  ret i16 %ret
}

define i8 @reduction_smin_trunc(ptr noalias nocapture %ptr) {
; CHECK-LABEL: @reduction_smin_trunc(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[SUM_02P:%.*]] = phi i32 [ [[MIN:%.*]], [[FOR_BODY]] ], [ 256, [[ENTRY]] ]
; CHECK-NEXT:    [[SUM_02:%.*]] = and i32 [[SUM_02P]], 255
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[IV]] to i64
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i8, ptr [[PTR:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    [[LOAD:%.*]] = load i8, ptr [[GEP]], align 1
; CHECK-NEXT:    [[EXT:%.*]] = sext i8 [[LOAD]] to i32
; CHECK-NEXT:    [[MIN]] = call i32 @llvm.smin.i32(i32 [[SUM_02]], i32 [[EXT]])
; CHECK-NEXT:    [[IV_NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i32 [[IV_NEXT]], 256
; CHECK-NEXT:    br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK:       for.end:
; CHECK-NEXT:    [[RET:%.*]] = trunc i32 [[MIN]] to i8
; CHECK-NEXT:    ret i8 [[RET]]
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %sum.02p = phi i32 [ %min, %for.body ], [ 256, %entry ]
  %sum.02 = and i32 %sum.02p, 255
  %gep = getelementptr inbounds i8, ptr %ptr, i32 %iv
  %load = load i8, ptr %gep
  %ext = sext i8 %load to i32
  %icmp = icmp slt i32 %sum.02, %ext
  %min = select i1 %icmp, i32 %sum.02, i32 %ext
  %iv.next = add i32 %iv, 1
  %exitcond = icmp eq i32 %iv.next, 256
  br i1 %exitcond, label %for.end, label %for.body

for.end:
  %ret = trunc i32 %min to i8
  ret i8 %ret
}

define i8 @reduction_umin_trunc(ptr noalias nocapture %ptr) {
; CHECK-LABEL: @reduction_umin_trunc(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[SUM_02P:%.*]] = phi i32 [ [[MIN:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[SUM_02:%.*]] = and i32 [[SUM_02P]], 255
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[IV]] to i64
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i8, ptr [[PTR:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    [[LOAD:%.*]] = load i8, ptr [[GEP]], align 1
; CHECK-NEXT:    [[EXT:%.*]] = zext i8 [[LOAD]] to i32
; CHECK-NEXT:    [[MIN]] = call i32 @llvm.umin.i32(i32 [[SUM_02]], i32 [[EXT]])
; CHECK-NEXT:    [[IV_NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i32 [[IV_NEXT]], 256
; CHECK-NEXT:    br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK:       for.end:
; CHECK-NEXT:    [[RET:%.*]] = trunc nuw i32 [[MIN]] to i8
; CHECK-NEXT:    ret i8 [[RET]]
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %sum.02p = phi i32 [ %min, %for.body ], [ 0, %entry ]
  %sum.02 = and i32 %sum.02p, 255
  %gep = getelementptr inbounds i8, ptr %ptr, i32 %iv
  %load = load i8, ptr %gep
  %ext = zext i8 %load to i32
  %icmp = icmp ult i32 %sum.02, %ext
  %min = select i1 %icmp, i32 %sum.02, i32 %ext
  %iv.next = add i32 %iv, 1
  %exitcond = icmp eq i32 %iv.next, 256
  br i1 %exitcond, label %for.end, label %for.body

for.end:
  %ret = trunc i32 %min to i8
  ret i8 %ret
}

define i16 @reduction_smax_trunc(ptr noalias nocapture %ptr) {
; CHECK-LABEL: @reduction_smax_trunc(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[SUM_02P:%.*]] = phi i32 [ [[MIN:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[SUM_02:%.*]] = and i32 [[SUM_02P]], 65535
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[IV]] to i64
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i16, ptr [[PTR:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    [[LOAD:%.*]] = load i16, ptr [[GEP]], align 2
; CHECK-NEXT:    [[EXT:%.*]] = sext i16 [[LOAD]] to i32
; CHECK-NEXT:    [[MIN]] = call i32 @llvm.smax.i32(i32 [[SUM_02]], i32 [[EXT]])
; CHECK-NEXT:    [[IV_NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i32 [[IV_NEXT]], 256
; CHECK-NEXT:    br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK:       for.end:
; CHECK-NEXT:    [[RET:%.*]] = trunc i32 [[MIN]] to i16
; CHECK-NEXT:    ret i16 [[RET]]
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %sum.02p = phi i32 [ %min, %for.body ], [ 0, %entry ]
  %sum.02 = and i32 %sum.02p, 65535
  %gep = getelementptr inbounds i16, ptr %ptr, i32 %iv
  %load = load i16, ptr %gep
  %ext = sext i16 %load to i32
  %icmp = icmp sgt i32 %sum.02, %ext
  %min = select i1 %icmp, i32 %sum.02, i32 %ext
  %iv.next = add i32 %iv, 1
  %exitcond = icmp eq i32 %iv.next, 256
  br i1 %exitcond, label %for.end, label %for.body

for.end:
  %ret = trunc i32 %min to i16
  ret i16 %ret
}

define i16 @reduction_umax_trunc(ptr noalias nocapture %ptr) {
; CHECK-LABEL: @reduction_umax_trunc(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[SUM_02P:%.*]] = phi i32 [ [[MIN:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT:    [[SUM_02:%.*]] = and i32 [[SUM_02P]], 65535
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[IV]] to i64
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i16, ptr [[PTR:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    [[LOAD:%.*]] = load i16, ptr [[GEP]], align 2
; CHECK-NEXT:    [[EXT:%.*]] = zext i16 [[LOAD]] to i32
; CHECK-NEXT:    [[MIN]] = call i32 @llvm.umax.i32(i32 [[SUM_02]], i32 [[EXT]])
; CHECK-NEXT:    [[IV_NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i32 [[IV_NEXT]], 256
; CHECK-NEXT:    br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK:       for.end:
; CHECK-NEXT:    [[RET:%.*]] = trunc nuw i32 [[MIN]] to i16
; CHECK-NEXT:    ret i16 [[RET]]
;
entry:
  br label %for.body

for.body:
  %iv = phi i32 [ %iv.next, %for.body ], [ 0, %entry ]
  %sum.02p = phi i32 [ %min, %for.body ], [ 0, %entry ]
  %sum.02 = and i32 %sum.02p, 65535
  %gep = getelementptr inbounds i16, ptr %ptr, i32 %iv
  %load = load i16, ptr %gep
  %ext = zext i16 %load to i32
  %icmp = icmp ugt i32 %sum.02, %ext
  %min = select i1 %icmp, i32 %sum.02, i32 %ext
  %iv.next = add i32 %iv, 1
  %exitcond = icmp eq i32 %iv.next, 256
  br i1 %exitcond, label %for.end, label %for.body

for.end:
  %ret = trunc i32 %min to i16
  ret i16 %ret
}

; Test case for https://github.com/llvm/llvm-project/issues/81415.
define i32 @reduction_and_or(i16 %a, i32 %b, ptr %src) {
; CHECK-LABEL: @reduction_and_or(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VEC_PHI:%.*]] = phi <8 x i32> [ <i32 10, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>, [[VECTOR_PH]] ], [ [[TMP2:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[INDEX]] to i64
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[SRC:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <8 x i32>, ptr [[TMP1]], align 4
; CHECK-NEXT:    [[TMP2]] = or <8 x i32> [[VEC_PHI]], [[WIDE_LOAD]]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 8
; CHECK-NEXT:    [[TMP3:%.*]] = icmp eq i32 [[INDEX_NEXT]], 992
; CHECK-NEXT:    br i1 [[TMP3]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]]
; CHECK:       middle.block:
; CHECK-NEXT:    [[TMP4:%.*]] = call i32 @llvm.vector.reduce.or.v8i32(<8 x i32> [[TMP2]])
; CHECK-NEXT:    br i1 false, label [[EXIT:%.*]], label [[SCALAR_PH]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    [[BC_MERGE_RDX:%.*]] = phi i32 [ [[TMP4]], [[MIDDLE_BLOCK]] ], [ poison, [[ENTRY:%.*]] ]
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 992, [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[OR67:%.*]] = phi i32 [ [[BC_MERGE_RDX]], [[SCALAR_PH]] ], [ [[OR:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[TMP5:%.*]] = zext nneg i32 [[IV]] to i64
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds nuw i32, ptr [[SRC]], i64 [[TMP5]]
; CHECK-NEXT:    [[L:%.*]] = load i32, ptr [[GEP]], align 4
; CHECK-NEXT:    [[OR]] = or i32 [[OR67]], [[L]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT:    [[TOBOOL_NOT:%.*]] = icmp eq i32 [[IV_NEXT]], 999
; CHECK-NEXT:    br i1 [[TOBOOL_NOT]], label [[EXIT]], label [[LOOP]], !llvm.loop [[LOOP9:![0-9]+]]
; CHECK:       exit:
; CHECK-NEXT:    [[OR_LCSSA:%.*]] = phi i32 [ [[OR]], [[LOOP]] ], [ poison, [[MIDDLE_BLOCK]] ]
; CHECK-NEXT:    ret i32 [[OR_LCSSA]]
;
entry:
  %ext1 = zext i16 %a to i32
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
  %or67 = phi i32 [ 10, %entry ], [ %or, %loop ]
  %t = trunc i32 %b to i16
  %ext = sext i16 %t to i32
  %cmp = icmp sgt i32 %ext, %ext1
  %ext2 = zext i1 %cmp to i32
  %cmp3 = icmp sge i32 %iv, %ext2
  %ext4 = zext i1 %cmp3 to i32
  %div = sdiv i32 %ext4, %b
  %and = and i32 %div, 0
  %gep = getelementptr inbounds i32, ptr %src, i32 %iv
  %l = load i32, ptr %gep
  %add = add i32 %and, %l
  %or = or i32 %or67, %add
  %iv.next = add nsw i32 %iv, 1
  %tobool.not = icmp eq i32 %iv.next, 999
  br i1 %tobool.not, label %exit, label %loop

exit:
  %or.lcssa = phi i32 [ %or, %loop ]
  ret i32 %or.lcssa
}