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
56
57
58
59
60
61
62
|
// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 5
// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -O3 -o - -emit-llvm %s | FileCheck %s
// Make sure that we do not set inbounds flag if the base pointer may be a constant null.
// CHECK-LABEL: define dso_local ptr @glibc_ptr_align(
// CHECK-SAME: ptr noundef readnone captures(none) [[BASE:%.*]], ptr noundef [[POINTER:%.*]], i64 noundef [[ALIGN_MASK:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[SUB_PTR_LHS_CAST:%.*]] = ptrtoint ptr [[POINTER]] to i64
// CHECK-NEXT: [[ADD:%.*]] = add nsw i64 [[ALIGN_MASK]], [[SUB_PTR_LHS_CAST]]
// CHECK-NEXT: [[NOT:%.*]] = xor i64 [[ALIGN_MASK]], -1
// CHECK-NEXT: [[AND:%.*]] = and i64 [[ADD]], [[NOT]]
// CHECK-NEXT: [[TMP0:%.*]] = inttoptr i64 [[AND]] to ptr
// CHECK-NEXT: ret ptr [[TMP0]]
//
char *glibc_ptr_align(char *base, char *pointer, long align_mask) {
return (sizeof(long int) < sizeof(void *) ? (base) : (char *)0) +
(((pointer) -
(sizeof(long int) < sizeof(void *) ? (base) : (char *)0) +
(align_mask)) &
~(align_mask));
}
// CHECK-LABEL: define dso_local ptr @glibc_ptr_align_commuted(
// CHECK-SAME: ptr noundef readnone captures(none) [[BASE:%.*]], ptr noundef [[POINTER:%.*]], i64 noundef [[ALIGN_MASK:%.*]]) local_unnamed_addr #[[ATTR0]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[SUB_PTR_LHS_CAST:%.*]] = ptrtoint ptr [[POINTER]] to i64
// CHECK-NEXT: [[ADD:%.*]] = add nsw i64 [[ALIGN_MASK]], [[SUB_PTR_LHS_CAST]]
// CHECK-NEXT: [[NOT:%.*]] = xor i64 [[ALIGN_MASK]], -1
// CHECK-NEXT: [[AND:%.*]] = and i64 [[ADD]], [[NOT]]
// CHECK-NEXT: [[TMP0:%.*]] = inttoptr i64 [[AND]] to ptr
// CHECK-NEXT: ret ptr [[TMP0]]
//
char *glibc_ptr_align_commuted(char *base, char *pointer, long align_mask) {
return (sizeof(long int) >= sizeof(void *) ? (char *)0 : (base)) +
(((pointer) -
(sizeof(long int) >= sizeof(void *) ? (char *)0 : (base)) +
(align_mask)) &
~(align_mask));
}
// CHECK-LABEL: define dso_local ptr @glibc_ptr_align_non_constexpr(
// CHECK-SAME: ptr noundef [[BASE:%.*]], ptr noundef [[POINTER:%.*]], i64 noundef [[ALIGN_MASK:%.*]], i32 noundef [[COND:%.*]]) local_unnamed_addr #[[ATTR0]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[COND]], 0
// CHECK-NEXT: [[COND1:%.*]] = select i1 [[TOBOOL_NOT]], ptr null, ptr [[BASE]]
// CHECK-NEXT: [[SUB_PTR_LHS_CAST:%.*]] = ptrtoint ptr [[POINTER]] to i64
// CHECK-NEXT: [[SUB_PTR_RHS_CAST:%.*]] = ptrtoint ptr [[COND1]] to i64
// CHECK-NEXT: [[SUB_PTR_SUB:%.*]] = add i64 [[ALIGN_MASK]], [[SUB_PTR_LHS_CAST]]
// CHECK-NEXT: [[ADD:%.*]] = sub i64 [[SUB_PTR_SUB]], [[SUB_PTR_RHS_CAST]]
// CHECK-NEXT: [[NOT:%.*]] = xor i64 [[ALIGN_MASK]], -1
// CHECK-NEXT: [[AND:%.*]] = and i64 [[ADD]], [[NOT]]
// CHECK-NEXT: [[ADD_PTR:%.*]] = getelementptr inbounds i8, ptr [[COND1]], i64 [[AND]]
// CHECK-NEXT: ret ptr [[ADD_PTR]]
//
char *glibc_ptr_align_non_constexpr(char *base, char *pointer, long align_mask, int cond) {
return (cond ? (base) : (char *)0) +
(((pointer) -
(cond ? (base) : (char *)0) +
(align_mask)) &
~(align_mask));
}
|
