reference, declaration → definition
definition → references, declarations, derived classes, virtual overrides
reference to multiple definitions → definitions
unreferenced

    1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22

; RUN: opt < %s -basicaa -memcpyopt -S | FileCheck %s

target datalayout = "e"

declare void @foo(i8*)
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i1) nounwind

define void @test() {
  %ptr1 = alloca i8
  %ptr2 = alloca i8
  call void @foo(i8* %ptr2)
  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %ptr1, i8* %ptr2, i32 1, i1 false)
  call void @foo(i8* %ptr1)
  ret void

  ; Check that the transformation isn't applied if the called function can
  ; capture the pointer argument (i.e. the nocapture attribute isn't present)
  ; CHECK-LABEL: @test(
  ; CHECK: call void @foo(i8* %ptr2)
  ; CHECK-NEXT: call void @llvm.memcpy
  ; CHECK-NEXT: call void @foo(i8* %ptr1)
}