xref: /llvm-project/llvm/test/Transforms/LoopVectorize/X86/gep-use-outside-loop.ll (revision 3ff1d0198575282ad585c891b2e61e904a7d8c5a)

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -p loop-vectorize -mtriple=x86_64-apple-macosx -mcpu=skylake-avx512 -force-vector-width=4 -force-vector-interleave=1 -S %s | FileCheck %s

; Test case for https://github.com/llvm/llvm-project/issues/102934.
define void @gep_use_in_dead_block(ptr noalias %dst, ptr %src) {
; CHECK-LABEL: define void @gep_use_in_dead_block(
; CHECK-SAME: ptr noalias [[DST:%.*]], ptr [[SRC:%.*]]) #[[ATTR0:[0-9]+]] {
; 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 i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr i16, ptr [[SRC]], i64 [[TMP0]]
; CHECK-NEXT:    [[TMP5:%.*]] = getelementptr i16, ptr [[TMP4]], i32 0
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i16>, ptr [[TMP5]], align 2
; CHECK-NEXT:    [[TMP6:%.*]] = icmp eq <4 x i16> [[WIDE_LOAD]], splat (i16 10)
; CHECK-NEXT:    [[TMP7:%.*]] = xor <4 x i1> [[TMP6]], splat (i1 true)
; CHECK-NEXT:    [[TMP8:%.*]] = getelementptr i16, ptr [[DST]], i64 [[TMP0]]
; CHECK-NEXT:    [[TMP12:%.*]] = getelementptr i16, ptr [[TMP8]], i32 0
; CHECK-NEXT:    call void @llvm.masked.store.v4i16.p0(<4 x i16> zeroinitializer, ptr [[TMP12]], i32 2, <4 x i1> [[TMP7]])
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP13:%.*]] = icmp eq i64 [[INDEX_NEXT]], 96
; CHECK-NEXT:    br i1 [[TMP13]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br i1 false, label %[[EXIT:.*]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 96, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[LOOP_HEADER:.*]]
; CHECK:       [[LOOP_HEADER]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT:    [[GEP_SRC:%.*]] = getelementptr i16, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i16, ptr [[GEP_SRC]], align 2
; CHECK-NEXT:    [[C:%.*]] = icmp eq i16 [[L]], 10
; CHECK-NEXT:    br i1 [[C]], label %[[LOOP_LATCH]], label %[[THEN:.*]]
; CHECK:       [[THEN]]:
; CHECK-NEXT:    [[GEP_DST:%.*]] = getelementptr i16, ptr [[DST]], i64 [[IV]]
; CHECK-NEXT:    store i16 0, ptr [[GEP_DST]], align 2
; CHECK-NEXT:    br label %[[LOOP_LATCH]]
; CHECK:       [[DEAD:.*]]:
; CHECK-NEXT:    store i16 0, ptr [[GEP_DST]], align 2
; CHECK-NEXT:    br label %[[DEAD]]
; CHECK:       [[LOOP_LATCH]]:
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT:    [[EC:%.*]] = icmp eq i64 [[IV_NEXT]], 99
; CHECK-NEXT:    br i1 [[EC]], label %[[EXIT]], label %[[LOOP_HEADER]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
  %gep.src = getelementptr i16, ptr %src, i64 %iv
  %l = load i16, ptr %gep.src
  %c = icmp eq i16 %l, 10
  br i1 %c, label %loop.latch, label %then

then:
  %gep.dst = getelementptr i16, ptr %dst, i64 %iv
  store i16 0, ptr %gep.dst, align 2
  br label %loop.latch

dead:
  store i16 0, ptr %gep.dst, align 2
  br label %dead

loop.latch:
  %iv.next = add i64 %iv, 1
  %ec = icmp eq i64 %iv.next, 99
  br i1 %ec, label %exit, label %loop.header

exit:
  ret void
}

define void @gep_use_outside_loop(ptr noalias %dst, ptr %src) {
; CHECK-LABEL: define void @gep_use_outside_loop(
; CHECK-SAME: ptr noalias [[DST:%.*]], ptr [[SRC:%.*]]) #[[ATTR0]] {
; 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 i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <4 x i64> [ <i64 0, i64 1, i64 2, i64 3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr i16, ptr [[DST]], <4 x i64> [[VEC_IND]]
; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr i16, ptr [[SRC]], i64 [[TMP0]]
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr i16, ptr [[TMP2]], i32 0
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i16>, ptr [[TMP3]], align 2
; CHECK-NEXT:    [[TMP4:%.*]] = icmp eq <4 x i16> [[WIDE_LOAD]], splat (i16 10)
; CHECK-NEXT:    [[TMP5:%.*]] = xor <4 x i1> [[TMP4]], splat (i1 true)
; CHECK-NEXT:    [[TMP6:%.*]] = extractelement <4 x ptr> [[TMP1]], i32 0
; CHECK-NEXT:    [[TMP7:%.*]] = getelementptr i16, ptr [[TMP6]], i32 0
; CHECK-NEXT:    call void @llvm.masked.store.v4i16.p0(<4 x i16> zeroinitializer, ptr [[TMP7]], i32 2, <4 x i1> [[TMP5]])
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <4 x i64> [[VEC_IND]], splat (i64 4)
; CHECK-NEXT:    [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], 96
; CHECK-NEXT:    br i1 [[TMP8]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[TMP9:%.*]] = extractelement <4 x ptr> [[TMP1]], i32 3
; CHECK-NEXT:    br i1 false, label %[[EXIT:.*]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 96, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[LOOP_HEADER:.*]]
; CHECK:       [[LOOP_HEADER]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT:    [[GEP_DST:%.*]] = getelementptr i16, ptr [[DST]], i64 [[IV]]
; CHECK-NEXT:    [[GEP_SRC:%.*]] = getelementptr i16, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i16, ptr [[GEP_SRC]], align 2
; CHECK-NEXT:    [[C:%.*]] = icmp eq i16 [[L]], 10
; CHECK-NEXT:    br i1 [[C]], label %[[LOOP_LATCH]], label %[[THEN:.*]]
; CHECK:       [[THEN]]:
; CHECK-NEXT:    store i16 0, ptr [[GEP_DST]], align 2
; CHECK-NEXT:    br label %[[LOOP_LATCH]]
; CHECK:       [[LOOP_LATCH]]:
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT:    [[EC:%.*]] = icmp eq i64 [[IV_NEXT]], 99
; CHECK-NEXT:    br i1 [[EC]], label %[[EXIT]], label %[[LOOP_HEADER]], !llvm.loop [[LOOP5:![0-9]+]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[GEP_DST_LCSSA:%.*]] = phi ptr [ [[GEP_DST]], %[[LOOP_LATCH]] ], [ [[TMP9]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT:    store i16 0, ptr [[GEP_DST_LCSSA]], align 2
; CHECK-NEXT:    ret void
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
  %gep.dst = getelementptr i16, ptr %dst, i64 %iv
  %gep.src = getelementptr i16, ptr %src, i64 %iv
  %l = load i16, ptr %gep.src
  %c = icmp eq i16 %l, 10
  br i1 %c, label %loop.latch, label %then

then:
  store i16 0, ptr %gep.dst, align 2
  br label %loop.latch

loop.latch:
  %iv.next = add i64 %iv, 1
  %ec = icmp eq i64 %iv.next, 99
  br i1 %ec, label %exit, label %loop.header

exit:
  store i16 0, ptr %gep.dst, align 2
  ret void
}
;.
; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]], [[META2:![0-9]+]]}
; CHECK: [[META1]] = !{!"llvm.loop.isvectorized", i32 1}
; CHECK: [[META2]] = !{!"llvm.loop.unroll.runtime.disable"}
; CHECK: [[LOOP3]] = distinct !{[[LOOP3]], [[META2]], [[META1]]}
; CHECK: [[LOOP4]] = distinct !{[[LOOP4]], [[META1]], [[META2]]}
; CHECK: [[LOOP5]] = distinct !{[[LOOP5]], [[META2]], [[META1]]}
;.