source: icGREP/icgrep-devel/llvm-3.8.0.src/test/CodeGen/AArch64/arm64-memset-to-bzero.ll @ 5027

Last change on this file since 5027 was 5027, checked in by cameron, 3 years ago

Upgrade to llvm 3.8

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1; RUN: llc %s -mtriple=arm64-apple-darwin -o - | \
2; RUN:   FileCheck --check-prefix=CHECK-DARWIN --check-prefix=CHECK %s
3; RUN: llc %s -mtriple=arm64-linux-gnu -o - | \
4; RUN:   FileCheck --check-prefix=CHECK-LINUX --check-prefix=CHECK %s
5; <rdar://problem/14199482> ARM64: Calls to bzero() replaced with calls to memset()
6
7; CHECK: @fct1
8; For small size (<= 256), we do not change memset to bzero.
9; CHECK: memset
10define void @fct1(i8* nocapture %ptr) {
11entry:
12  tail call void @llvm.memset.p0i8.i64(i8* %ptr, i8 0, i64 256, i32 1, i1 false)
13  ret void
14}
15
16declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1)
17
18; CHECK: @fct2
19; When the size is bigger than 256, change into bzero.
20; CHECK-DARWIN: bzero
21; CHECK-LINUX: memset
22define void @fct2(i8* nocapture %ptr) {
23entry:
24  tail call void @llvm.memset.p0i8.i64(i8* %ptr, i8 0, i64 257, i32 1, i1 false)
25  ret void
26}
27
28; CHECK: @fct3
29; For unknown size, change to bzero.
30; CHECK-DARWIN: bzero
31; CHECK-LINUX: memset
32define void @fct3(i8* nocapture %ptr, i32 %unknown) {
33entry:
34  %conv = sext i32 %unknown to i64
35  tail call void @llvm.memset.p0i8.i64(i8* %ptr, i8 0, i64 %conv, i32 1, i1 false)
36  ret void
37}
38
39; CHECK: @fct4
40; Size <= 256, no change.
41; CHECK: memset
42define void @fct4(i8* %ptr) {
43entry:
44  %tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false)
45  %call = tail call i8* @__memset_chk(i8* %ptr, i32 0, i64 256, i64 %tmp)
46  ret void
47}
48
49declare i8* @__memset_chk(i8*, i32, i64, i64)
50
51declare i64 @llvm.objectsize.i64(i8*, i1)
52
53; CHECK: @fct5
54; Size > 256, change.
55; CHECK-DARWIN: bzero
56; CHECK-LINUX: memset
57define void @fct5(i8* %ptr) {
58entry:
59  %tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false)
60  %call = tail call i8* @__memset_chk(i8* %ptr, i32 0, i64 257, i64 %tmp)
61  ret void
62}
63
64; CHECK: @fct6
65; Size = unknown, change.
66; CHECK-DARWIN: bzero
67; CHECK-LINUX: memset
68define void @fct6(i8* %ptr, i32 %unknown) {
69entry:
70  %conv = sext i32 %unknown to i64
71  %tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false)
72  %call = tail call i8* @__memset_chk(i8* %ptr, i32 0, i64 %conv, i64 %tmp)
73  ret void
74}
75
76; Next functions check that memset is not turned into bzero
77; when the set constant is non-zero, whatever the given size.
78
79; CHECK: @fct7
80; memset with something that is not a zero, no change.
81; CHECK: memset
82define void @fct7(i8* %ptr) {
83entry:
84  %tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false)
85  %call = tail call i8* @__memset_chk(i8* %ptr, i32 1, i64 256, i64 %tmp)
86  ret void
87}
88
89; CHECK: @fct8
90; memset with something that is not a zero, no change.
91; CHECK: memset
92define void @fct8(i8* %ptr) {
93entry:
94  %tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false)
95  %call = tail call i8* @__memset_chk(i8* %ptr, i32 1, i64 257, i64 %tmp)
96  ret void
97}
98
99; CHECK: @fct9
100; memset with something that is not a zero, no change.
101; CHECK: memset
102define void @fct9(i8* %ptr, i32 %unknown) {
103entry:
104  %conv = sext i32 %unknown to i64
105  %tmp = tail call i64 @llvm.objectsize.i64(i8* %ptr, i1 false)
106  %call = tail call i8* @__memset_chk(i8* %ptr, i32 1, i64 %conv, i64 %tmp)
107  ret void
108}
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