llvm/llvm/test/Transforms/LoopLoadElim/early-exit.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

target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"

define void @f(ptr %A, ptr %B, ptr %C, i64 %N) {
; CHECK-LABEL: define void @f(
; CHECK-SAME: ptr [[A:%.*]], ptr [[B:%.*]], ptr [[C:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[FOR_BODY_LVER_CHECK:.*]]:
; CHECK-NEXT:    br label %[[FOR_BODY:.*]]
; CHECK:       [[FOR_BODY]]:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ 0, %[[FOR_BODY_LVER_CHECK]] ], [ [[INDVARS_IV_NEXT:%.*]], %[[LATCH:.*]] ]
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[AIDX_NEXT:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[INDVARS_IV_NEXT]]
; CHECK-NEXT:    [[BIDX:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    [[CIDX:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    [[AIDX:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    [[B:%.*]] = load i32, ptr [[BIDX]], align 4
; CHECK-NEXT:    [[UNCOUNTABLE_C:%.*]] = icmp eq i32 [[B]], 10
; CHECK-NEXT:    br i1 [[UNCOUNTABLE_C]], label %[[LATCH]], label %[[FOR_END:.*]]
; CHECK:       [[LATCH]]:
; CHECK-NEXT:    [[A_P1:%.*]] = add i32 [[B]], 2
; CHECK-NEXT:    store i32 [[A_P1]], ptr [[AIDX_NEXT]], align 4
; CHECK-NEXT:    [[A:%.*]] = load i32, ptr [[AIDX]], align 1
; CHECK-NEXT:    [[C:%.*]] = mul i32 [[A]], 2
; CHECK-NEXT:    store i32 [[C]], ptr [[CIDX]], align 4
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[EXITCOND]], label %[[FOR_END]], label %[[FOR_BODY]]
; CHECK:       [[FOR_END]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:                                         ; preds = %for.body, %entry
  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %latch ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1

  %Aidx_next = getelementptr inbounds i32, ptr %A, i64 %indvars.iv.next
  %Bidx = getelementptr inbounds i32, ptr %B, i64 %indvars.iv
  %Cidx = getelementptr inbounds i32, ptr %C, i64 %indvars.iv
  %Aidx = getelementptr inbounds i32, ptr %A, i64 %indvars.iv

  %b = load i32, ptr %Bidx, align 4
  %uncountable.c = icmp eq i32 %b, 10
  br i1 %uncountable.c, label  %latch, label %for.end

latch:
  %a_p1 = add i32 %b, 2
  store i32 %a_p1, ptr %Aidx_next, align 4

  %a = load i32, ptr %Aidx, align 1
  %c = mul i32 %a, 2
  store i32 %c, ptr %Cidx, align 4

  %exitcond = icmp eq i64 %indvars.iv.next, %N
  br i1 %exitcond, label %for.end, label %for.body

for.end:                                          ; preds = %for.body
  ret void
}