maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/llvm/test/Transforms/MemCpyOpt/non-integral.ll

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

37 lines
1.6 KiB
LLVM
Raw Normal View History

[memcpyopt] Conservatively handle non-integral pointers If we allow the non-integral pointers to become memset and memcpy, we loose the ability to reason about pointer propagation. This patch is modeled on changes we've carried downstream for a long time, figured it was worth being equally conservative for other users. There is room to refine the semantics and handling here if anyone is motivated.
2020-10-02 07:44:12 +08:00
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
[MemCpyOpt] Remove MemDepAnalysis-based implementation The MemorySSA-based implementation has been enabled for a few months (since D94376). This patch drops the old MDA-based implementation entirely. I've kept this to only the basic cleanup of dropping various conditions -- the code could be further cleaned up now that there is only one implementation. Differential Revision: https://reviews.llvm.org/D102113
2021-05-09 02:39:54 +08:00
; RUN: opt -memcpyopt -S < %s -verify-memoryssa | FileCheck %s
[memcpyopt] Conservatively handle non-integral pointers If we allow the non-integral pointers to become memset and memcpy, we loose the ability to reason about pointer propagation. This patch is modeled on changes we've carried downstream for a long time, figured it was worth being equally conservative for other users. There is room to refine the semantics and handling here if anyone is motivated.
2020-10-02 07:44:12 +08:00
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128-ni:1"
define void @illegal_memset(i64 addrspace(1)** %p) {
; CHECK-LABEL: @illegal_memset(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[P1:%.*]] = bitcast i64 addrspace(1)** [[P:%.*]] to i8*
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* [[P1]], i8 0, i64 8, i1 false)
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i64 addrspace(1)*, i64 addrspace(1)** [[P]], i64 1
; CHECK-NEXT: store i64 addrspace(1)* null, i64 addrspace(1)** [[GEP]], align 8
; CHECK-NEXT: ret void
;
entry:
%p1 = bitcast i64 addrspace(1)** %p to i8*
call void @llvm.memset.p0i8.i64(i8* %p1, i8 0, i64 8, i32 0, i1 false)
%gep = getelementptr i64 addrspace(1)*, i64 addrspace(1)** %p, i64 1
store i64 addrspace(1)* null, i64 addrspace(1)** %gep
ret void
}
define void @illegal_memcpy(<2 x i8 addrspace(1)*>* noalias align 16 %a,
; CHECK-LABEL: @illegal_memcpy(
; CHECK-NEXT: [[VAL:%.*]] = load <2 x i8 addrspace(1)*>, <2 x i8 addrspace(1)*>* [[A:%.*]], align 16
; CHECK-NEXT: store <2 x i8 addrspace(1)*> [[VAL]], <2 x i8 addrspace(1)*>* [[B:%.*]], align 16
; CHECK-NEXT: ret void
;
<2 x i8 addrspace(1)*>* noalias align 16 %b) {
%val = load <2 x i8 addrspace(1)*>, <2 x i8 addrspace(1)*>* %a, align 16
store <2 x i8 addrspace(1)*> %val, <2 x i8 addrspace(1)*>* %b, align 16
ret void
}
declare void @llvm.memset.p1i8.i64(i8 addrspace(1)*, i8, i64, i32, i1)
declare void @llvm.memset.p0i8.i64(i8*, i8, i64, i32, i1)