61a8da9367
This patch adds a workaround for the old glibc `__PTR_ALIGN` macro:
```
((sizeof(long int) < sizeof(void *) ? (base) : (char *)0) +
(((pointer) - (sizeof(long int) < sizeof(void *) ? (base) : (char *)0) +
(align_mask)) &
~(align_mask)));
```
Closes https://github.com/llvm/llvm-project/issues/137833.
63 lines
3.2 KiB
C
63 lines
3.2 KiB
C
// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 5
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// RUN: %clang_cc1 -triple=x86_64-unknown-unknown -O3 -o - -emit-llvm %s | FileCheck %s
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// Make sure that we do not set inbounds flag if the base pointer may be a constant null.
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// CHECK-LABEL: define dso_local ptr @glibc_ptr_align(
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// CHECK-SAME: ptr noundef readnone captures(none) [[BASE:%.*]], ptr noundef [[POINTER:%.*]], i64 noundef [[ALIGN_MASK:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
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// CHECK-NEXT: [[ENTRY:.*:]]
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// CHECK-NEXT: [[SUB_PTR_LHS_CAST:%.*]] = ptrtoint ptr [[POINTER]] to i64
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// CHECK-NEXT: [[ADD:%.*]] = add nsw i64 [[ALIGN_MASK]], [[SUB_PTR_LHS_CAST]]
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// CHECK-NEXT: [[NOT:%.*]] = xor i64 [[ALIGN_MASK]], -1
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// CHECK-NEXT: [[AND:%.*]] = and i64 [[ADD]], [[NOT]]
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// CHECK-NEXT: [[TMP0:%.*]] = inttoptr i64 [[AND]] to ptr
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// CHECK-NEXT: ret ptr [[TMP0]]
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//
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char *glibc_ptr_align(char *base, char *pointer, long align_mask) {
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return (sizeof(long int) < sizeof(void *) ? (base) : (char *)0) +
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(((pointer) -
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(sizeof(long int) < sizeof(void *) ? (base) : (char *)0) +
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(align_mask)) &
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~(align_mask));
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}
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// CHECK-LABEL: define dso_local ptr @glibc_ptr_align_commuted(
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// CHECK-SAME: ptr noundef readnone captures(none) [[BASE:%.*]], ptr noundef [[POINTER:%.*]], i64 noundef [[ALIGN_MASK:%.*]]) local_unnamed_addr #[[ATTR0]] {
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// CHECK-NEXT: [[ENTRY:.*:]]
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// CHECK-NEXT: [[SUB_PTR_LHS_CAST:%.*]] = ptrtoint ptr [[POINTER]] to i64
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// CHECK-NEXT: [[ADD:%.*]] = add nsw i64 [[ALIGN_MASK]], [[SUB_PTR_LHS_CAST]]
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// CHECK-NEXT: [[NOT:%.*]] = xor i64 [[ALIGN_MASK]], -1
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// CHECK-NEXT: [[AND:%.*]] = and i64 [[ADD]], [[NOT]]
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// CHECK-NEXT: [[TMP0:%.*]] = inttoptr i64 [[AND]] to ptr
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// CHECK-NEXT: ret ptr [[TMP0]]
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//
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char *glibc_ptr_align_commuted(char *base, char *pointer, long align_mask) {
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return (sizeof(long int) >= sizeof(void *) ? (char *)0 : (base)) +
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(((pointer) -
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(sizeof(long int) >= sizeof(void *) ? (char *)0 : (base)) +
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(align_mask)) &
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~(align_mask));
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}
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// CHECK-LABEL: define dso_local ptr @glibc_ptr_align_non_constexpr(
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// CHECK-SAME: ptr noundef [[BASE:%.*]], ptr noundef [[POINTER:%.*]], i64 noundef [[ALIGN_MASK:%.*]], i32 noundef [[COND:%.*]]) local_unnamed_addr #[[ATTR0]] {
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// CHECK-NEXT: [[ENTRY:.*:]]
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// CHECK-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[COND]], 0
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// CHECK-NEXT: [[COND1:%.*]] = select i1 [[TOBOOL_NOT]], ptr null, ptr [[BASE]]
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// CHECK-NEXT: [[SUB_PTR_LHS_CAST:%.*]] = ptrtoint ptr [[POINTER]] to i64
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// CHECK-NEXT: [[SUB_PTR_RHS_CAST:%.*]] = ptrtoint ptr [[COND1]] to i64
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// CHECK-NEXT: [[SUB_PTR_SUB:%.*]] = add i64 [[ALIGN_MASK]], [[SUB_PTR_LHS_CAST]]
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// CHECK-NEXT: [[ADD:%.*]] = sub i64 [[SUB_PTR_SUB]], [[SUB_PTR_RHS_CAST]]
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// CHECK-NEXT: [[NOT:%.*]] = xor i64 [[ALIGN_MASK]], -1
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// CHECK-NEXT: [[AND:%.*]] = and i64 [[ADD]], [[NOT]]
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// CHECK-NEXT: [[ADD_PTR:%.*]] = getelementptr inbounds i8, ptr [[COND1]], i64 [[AND]]
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// CHECK-NEXT: ret ptr [[ADD_PTR]]
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//
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char *glibc_ptr_align_non_constexpr(char *base, char *pointer, long align_mask, int cond) {
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return (cond ? (base) : (char *)0) +
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(((pointer) -
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(cond ? (base) : (char *)0) +
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(align_mask)) &
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~(align_mask));
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}
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