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llvm-project/llvm/test/Transforms/MemCpyOpt/capturing-func.ll

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Don't eliminate memcpy's when the address of the pointer may itself be relevant. Fixes PR18304. Patch by David Wiberg! llvm-svn: 212970
2014-07-15 02:52:02 +08:00
; RUN: opt < %s -basicaa -memcpyopt -S | FileCheck %s
target datalayout = "e"
declare void @foo(i8*)
Revert "Change memcpy/memset/memmove to have dest and source alignments." This reverts commit r253511. This likely broke the bots in http://lab.llvm.org:8011/builders/clang-ppc64-elf-linux2/builds/20202 http://bb.pgr.jp/builders/clang-3stage-i686-linux/builds/3787 llvm-svn: 253543
2015-11-19 13:56:52 +08:00
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
Don't eliminate memcpy's when the address of the pointer may itself be relevant. Fixes PR18304. Patch by David Wiberg! llvm-svn: 212970
2014-07-15 02:52:02 +08:00
define void @test() {
%ptr1 = alloca i8
%ptr2 = alloca i8
call void @foo(i8* %ptr2)
Revert "Change memcpy/memset/memmove to have dest and source alignments." This reverts commit r253511. This likely broke the bots in http://lab.llvm.org:8011/builders/clang-ppc64-elf-linux2/builds/20202 http://bb.pgr.jp/builders/clang-3stage-i686-linux/builds/3787 llvm-svn: 253543
2015-11-19 13:56:52 +08:00
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %ptr1, i8* %ptr2, i32 1, i32 1, i1 false)
Don't eliminate memcpy's when the address of the pointer may itself be relevant. Fixes PR18304. Patch by David Wiberg! llvm-svn: 212970
2014-07-15 02:52:02 +08:00
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)
}