1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
; RUN: opt -basicaa -memcpyopt -instcombine -S < %s | FileCheck %s
target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define void @foo([8 x i64]* noalias nocapture sret dereferenceable(64) %sret) {
entry-block:
%a = alloca [8 x i64], align 8
%a.cast = bitcast [8 x i64]* %a to i8*
call void @llvm.lifetime.start(i64 64, i8* %a.cast)
call void @llvm.memset.p0i8.i64(i8* %a.cast, i8 0, i64 64, i32 8, i1 false)
%sret.cast = bitcast [8 x i64]* %sret to i8*
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %sret.cast, i8* %a.cast, i64 64, i32 8, i1 false)
call void @llvm.lifetime.end(i64 64, i8* %a.cast)
ret void
; CHECK-LABEL: @foo(
; CHECK: %[[sret_cast:[^=]+]] = bitcast [8 x i64]* %sret to i8*
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* %[[sret_cast]], i8 0, i64 64
; CHECK-NOT: call void @llvm.memcpy
; CHECK: ret void
}
define void @bar([8 x i64]* noalias nocapture sret dereferenceable(64) %sret, [8 x i64]* noalias nocapture dereferenceable(64) %out) {
entry-block:
%a = alloca [8 x i64], align 8
%a.cast = bitcast [8 x i64]* %a to i8*
call void @llvm.lifetime.start(i64 64, i8* %a.cast)
call void @llvm.memset.p0i8.i64(i8* %a.cast, i8 0, i64 64, i32 8, i1 false)
%sret.cast = bitcast [8 x i64]* %sret to i8*
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %sret.cast, i8* %a.cast, i64 64, i32 8, i1 false)
call void @llvm.memset.p0i8.i64(i8* %a.cast, i8 42, i64 32, i32 8, i1 false)
%out.cast = bitcast [8 x i64]* %out to i8*
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %out.cast, i8* %a.cast, i64 64, i32 8, i1 false)
call void @llvm.lifetime.end(i64 64, i8* %a.cast)
ret void
; CHECK-LABEL: @bar(
; CHECK: %[[a:[^=]+]] = alloca [8 x i64]
; CHECK: %[[a_cast:[^=]+]] = bitcast [8 x i64]* %[[a]] to i8*
; CHECK: call void @llvm.memset.p0i8.i64(i8* %[[a_cast]], i8 0, i64 64
; CHECK: %[[sret_cast:[^=]+]] = bitcast [8 x i64]* %sret to i8*
; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %[[sret_cast]], i8* %[[a_cast]], i64 64
; CHECK: call void @llvm.memset.p0i8.i64(i8* %[[a_cast]], i8 42, i64 32
; CHECK: %[[out_cast:[^=]+]] = bitcast [8 x i64]* %out to i8*
; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %[[out_cast]], i8* %[[a_cast]], i64 64
; CHECK-NOT: call void @llvm.memcpy
; CHECK: ret void
}
declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) nounwind
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
|
