test/Transforms/MemCpyOpt/mixed-sizes.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=memcpyopt -S -verify-memoryssa | FileCheck %s
; Handle memcpy-memcpy dependencies of differing sizes correctly.

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

; Don't delete the second memcpy, even though there's an earlier
; memcpy with a larger size from the same address.

define i32 @foo(i1 %z) {
; CHECK-LABEL: @foo(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[A:%.*]] = alloca [10 x i32], align 4
; CHECK-NEXT:    [[S:%.*]] = alloca [10 x i32], align 4
; CHECK-NEXT:    call void @llvm.memset.p0.i64(ptr nonnull align 16 [[S]], i8 0, i64 40, i1 false)
; CHECK-NEXT:    store i32 1, ptr [[A]], align 4
; CHECK-NEXT:    [[SCEVGEP:%.*]] = getelementptr [10 x i32], ptr [[S]], i64 0, i64 1
; CHECK-NEXT:    br i1 [[Z:%.*]], label [[FOR_BODY3_LR_PH:%.*]], label [[FOR_INC7_1:%.*]]
; CHECK:       for.body3.lr.ph:
; CHECK-NEXT:    br label [[FOR_INC7_1]]
; CHECK:       for.inc7.1:
; CHECK-NEXT:    call void @llvm.memcpy.p0.p0.i64(ptr align 4 [[A]], ptr align 4 [[SCEVGEP]], i64 4, i1 false)
; CHECK-NEXT:    [[TMP2:%.*]] = load i32, ptr [[A]], align 4
; CHECK-NEXT:    ret i32 [[TMP2]]
;
entry:
  %a = alloca [10 x i32]
  %s = alloca [10 x i32]
  call void @llvm.memset.p0.i64(ptr nonnull align 16 %s, i8 0, i64 40, i1 false)
  store i32 1, ptr %a
  %scevgep = getelementptr [10 x i32], ptr %s, i64 0, i64 1
  br i1 %z, label %for.body3.lr.ph, label %for.inc7.1

for.body3.lr.ph:                                  ; preds = %entry
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %a, ptr align 4 %scevgep, i64 17179869180, i1 false)
  br label %for.inc7.1

for.inc7.1:
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %a, ptr align 4 %scevgep, i64 4, i1 false)
  %0 = load i32, ptr %a
  ret i32 %0
}

declare void @llvm.memcpy.p0.p0.i64(ptr, ptr, i64, i1)
declare void @llvm.memset.p0.i64(ptr, i8, i64, i1)