llvm/test/Transforms/LoopLoadElim/unknown-stride-known-dep.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -passes=loop-load-elim -S %s | FileCheck %s

; The test was originally written as part of the investigation of #96656.
; The bug has now been marked as invalid, and we keep the test to show
; LLE's operation on known dependence returned by LAA.

define void @unknown_stride_known_dependence(ptr %x, ptr %y, i1 %cond) {
; CHECK-LABEL: define void @unknown_stride_known_dependence(
; CHECK-SAME: ptr [[X:%.*]], ptr [[Y:%.*]], i1 [[COND:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[LOAD:%.*]] = load i32, ptr [[X]], align 4
; CHECK-NEXT:    br i1 [[COND]], label %[[NOLOOP_EXIT:.*]], label %[[LOOP_LVER_CHECK:.*]]
; CHECK:       [[LOOP_LVER_CHECK]]:
; CHECK-NEXT:    [[SEXT_X:%.*]] = sext i32 [[LOAD]] to i64
; CHECK-NEXT:    [[GEP_8:%.*]] = getelementptr i8, ptr [[Y]], i64 8
; CHECK-NEXT:    [[GEP_16:%.*]] = getelementptr i8, ptr [[Y]], i64 16
; CHECK-NEXT:    [[IDENT_CHECK:%.*]] = icmp ne i32 [[LOAD]], 1
; CHECK-NEXT:    br i1 [[IDENT_CHECK]], label %[[LOOP_PH_LVER_ORIG:.*]], label %[[LOOP_PH:.*]]
; CHECK:       [[LOOP_PH_LVER_ORIG]]:
; CHECK-NEXT:    br label %[[LOOP_LVER_ORIG:.*]]
; CHECK:       [[LOOP_LVER_ORIG]]:
; CHECK-NEXT:    [[IV_LVER_ORIG:%.*]] = phi i64 [ 0, %[[LOOP_PH_LVER_ORIG]] ], [ [[IV_NEXT_LVER_ORIG:%.*]], %[[LOOP_LVER_ORIG]] ]
; CHECK-NEXT:    [[MUL_LVER_ORIG:%.*]] = mul i64 [[IV_LVER_ORIG]], [[SEXT_X]]
; CHECK-NEXT:    [[GEP_8_MUL_LVER_ORIG:%.*]] = getelementptr double, ptr [[GEP_8]], i64 [[MUL_LVER_ORIG]]
; CHECK-NEXT:    [[LOAD_8_LVER_ORIG:%.*]] = load double, ptr [[GEP_8_MUL_LVER_ORIG]], align 8
; CHECK-NEXT:    [[GEP_16_MUL_LVER_ORIG:%.*]] = getelementptr double, ptr [[GEP_16]], i64 [[MUL_LVER_ORIG]]
; CHECK-NEXT:    store double [[LOAD_8_LVER_ORIG]], ptr [[GEP_16_MUL_LVER_ORIG]], align 8
; CHECK-NEXT:    [[IV_NEXT_LVER_ORIG]] = add i64 [[IV_LVER_ORIG]], 1
; CHECK-NEXT:    [[ICMP_LVER_ORIG:%.*]] = icmp eq i64 [[IV_LVER_ORIG]], 1
; CHECK-NEXT:    br i1 [[ICMP_LVER_ORIG]], label %[[EXIT_LOOPEXIT_LOOPEXIT:.*]], label %[[LOOP_LVER_ORIG]]
; CHECK:       [[LOOP_PH]]:
; CHECK-NEXT:    [[LOAD_INITIAL:%.*]] = load double, ptr [[GEP_8]], align 8
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[STORE_FORWARDED:%.*]] = phi double [ [[LOAD_INITIAL]], %[[LOOP_PH]] ], [ [[STORE_FORWARDED]], %[[LOOP]] ]
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, %[[LOOP_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MUL:%.*]] = mul i64 [[IV]], [[SEXT_X]]
; CHECK-NEXT:    [[GEP_8_MUL:%.*]] = getelementptr double, ptr [[GEP_8]], i64 [[MUL]]
; CHECK-NEXT:    [[LOAD_8:%.*]] = load double, ptr [[GEP_8_MUL]], align 8
; CHECK-NEXT:    [[GEP_16_MUL:%.*]] = getelementptr double, ptr [[GEP_16]], i64 [[MUL]]
; CHECK-NEXT:    store double [[STORE_FORWARDED]], ptr [[GEP_16_MUL]], align 8
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT:    [[ICMP:%.*]] = icmp eq i64 [[IV]], 1
; CHECK-NEXT:    br i1 [[ICMP]], label %[[EXIT_LOOPEXIT_LOOPEXIT1:.*]], label %[[LOOP]]
; CHECK:       [[NOLOOP_EXIT]]:
; CHECK-NEXT:    [[SEXT:%.*]] = sext i32 [[LOAD]] to i64
; CHECK-NEXT:    [[GEP_Y:%.*]] = getelementptr double, ptr [[Y]], i64 [[SEXT]]
; CHECK-NEXT:    [[LOAD_Y:%.*]] = load double, ptr [[GEP_Y]], align 8
; CHECK-NEXT:    store double [[LOAD_Y]], ptr [[X]], align 8
; CHECK-NEXT:    br label %[[EXIT:.*]]
; CHECK:       [[EXIT_LOOPEXIT_LOOPEXIT]]:
; CHECK-NEXT:    br label %[[EXIT_LOOPEXIT:.*]]
; CHECK:       [[EXIT_LOOPEXIT_LOOPEXIT1]]:
; CHECK-NEXT:    br label %[[EXIT_LOOPEXIT]]
; CHECK:       [[EXIT_LOOPEXIT]]:
; CHECK-NEXT:    br label %[[EXIT]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  %load = load i32, ptr %x, align 4
  br i1 %cond, label %noloop.exit, label %loop.ph

loop.ph:                                              ; preds = %entry
  %sext.x = sext i32 %load to i64
  %gep.8 = getelementptr i8, ptr %y, i64 8
  %gep.16 = getelementptr i8, ptr %y, i64 16
  br label %loop

loop:                                                 ; preds = %loop, %loop.ph
  %iv = phi i64 [ 0, %loop.ph ], [ %iv.next, %loop ]
  %mul = mul i64 %iv, %sext.x
  %gep.8.mul = getelementptr double, ptr %gep.8, i64 %mul
  %load.8 = load double, ptr %gep.8.mul, align 8
  %gep.16.mul = getelementptr double, ptr %gep.16, i64 %mul
  store double %load.8, ptr %gep.16.mul
  %iv.next = add i64 %iv, 1
  %icmp = icmp eq i64 %iv, 1
  br i1 %icmp, label %exit, label %loop

noloop.exit:                                          ; preds = %loop.ph
  %sext = sext i32 %load to i64
  %gep.y = getelementptr double, ptr %y, i64 %sext
  %load.y = load double, ptr %gep.y
  store double %load.y, ptr %x
  br label %exit

exit:                                                 ; preds = %loop.body
  ret void
}