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llvm-project/clang/test/CodeGen/builtin-assume-aligned.c

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Add __builtin_assume and __builtin_assume_aligned using @llvm.assume. This makes use of the recently-added @llvm.assume intrinsic to implement a __builtin_assume(bool) intrinsic (to provide additional information to the optimizer). This hooks up __assume in MS-compatibility mode to mirror __builtin_assume (the semantics have been intentionally kept compatible), and implements GCC's __builtin_assume_aligned as assume((p - o) & mask == 0). LLVM now contains special logic to deal with assumptions of this form. llvm-svn: 217349
2014-09-08 06:58:14 +08:00
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s
// CHECK-LABEL: @test1
int test1(int *a) {
clang/test/CodeGen/builtin-assume*.c: Fixup for -Asserts. llvm-svn: 217352
2014-09-08 09:12:55 +08:00
// CHECK: [[PTRINT1:%.+]] = ptrtoint
// CHECK: [[MASKEDPTR1:%.+]] = and i64 [[PTRINT1]], 31
// CHECK: [[MASKCOND1:%.+]] = icmp eq i64 [[MASKEDPTR1]], 0
// CHECK: call void @llvm.assume(i1 [[MASKCOND1]])
Add __builtin_assume and __builtin_assume_aligned using @llvm.assume. This makes use of the recently-added @llvm.assume intrinsic to implement a __builtin_assume(bool) intrinsic (to provide additional information to the optimizer). This hooks up __assume in MS-compatibility mode to mirror __builtin_assume (the semantics have been intentionally kept compatible), and implements GCC's __builtin_assume_aligned as assume((p - o) & mask == 0). LLVM now contains special logic to deal with assumptions of this form. llvm-svn: 217349
2014-09-08 06:58:14 +08:00
a = __builtin_assume_aligned(a, 32, 0ull);
return a[0];
}
// CHECK-LABEL: @test2
int test2(int *a) {
clang/test/CodeGen/builtin-assume*.c: Fixup for -Asserts. llvm-svn: 217352
2014-09-08 09:12:55 +08:00
// CHECK: [[PTRINT2:%.+]] = ptrtoint
// CHECK: [[MASKEDPTR2:%.+]] = and i64 [[PTRINT2]], 31
// CHECK: [[MASKCOND2:%.+]] = icmp eq i64 [[MASKEDPTR2]], 0
// CHECK: call void @llvm.assume(i1 [[MASKCOND2]])
Add __builtin_assume and __builtin_assume_aligned using @llvm.assume. This makes use of the recently-added @llvm.assume intrinsic to implement a __builtin_assume(bool) intrinsic (to provide additional information to the optimizer). This hooks up __assume in MS-compatibility mode to mirror __builtin_assume (the semantics have been intentionally kept compatible), and implements GCC's __builtin_assume_aligned as assume((p - o) & mask == 0). LLVM now contains special logic to deal with assumptions of this form. llvm-svn: 217349
2014-09-08 06:58:14 +08:00
a = __builtin_assume_aligned(a, 32, 0);
return a[0];
}
// CHECK-LABEL: @test3
int test3(int *a) {
clang/test/CodeGen/builtin-assume*.c: Fixup for -Asserts. llvm-svn: 217352
2014-09-08 09:12:55 +08:00
// CHECK: [[PTRINT3:%.+]] = ptrtoint
// CHECK: [[MASKEDPTR3:%.+]] = and i64 [[PTRINT3]], 31
// CHECK: [[MASKCOND3:%.+]] = icmp eq i64 [[MASKEDPTR3]], 0
// CHECK: call void @llvm.assume(i1 [[MASKCOND3]])
Add __builtin_assume and __builtin_assume_aligned using @llvm.assume. This makes use of the recently-added @llvm.assume intrinsic to implement a __builtin_assume(bool) intrinsic (to provide additional information to the optimizer). This hooks up __assume in MS-compatibility mode to mirror __builtin_assume (the semantics have been intentionally kept compatible), and implements GCC's __builtin_assume_aligned as assume((p - o) & mask == 0). LLVM now contains special logic to deal with assumptions of this form. llvm-svn: 217349
2014-09-08 06:58:14 +08:00
a = __builtin_assume_aligned(a, 32);
return a[0];
}
// CHECK-LABEL: @test4
int test4(int *a, int b) {
clang/test/CodeGen/builtin-assume*.c: Fixup for -Asserts. llvm-svn: 217352
2014-09-08 09:12:55 +08:00
// CHECK-DAG: [[PTRINT4:%.+]] = ptrtoint
// CHECK-DAG: [[CONV4:%.+]] = sext i32
// CHECK: [[OFFSETPTR4:%.+]] = sub i64 [[PTRINT4]], [[CONV4]]
// CHECK: [[MASKEDPTR4:%.+]] = and i64 [[OFFSETPTR4]], 31
// CHECK: [[MASKCOND4:%.+]] = icmp eq i64 [[MASKEDPTR4]], 0
// CHECK: call void @llvm.assume(i1 [[MASKCOND4]])
Add __builtin_assume and __builtin_assume_aligned using @llvm.assume. This makes use of the recently-added @llvm.assume intrinsic to implement a __builtin_assume(bool) intrinsic (to provide additional information to the optimizer). This hooks up __assume in MS-compatibility mode to mirror __builtin_assume (the semantics have been intentionally kept compatible), and implements GCC's __builtin_assume_aligned as assume((p - o) & mask == 0). LLVM now contains special logic to deal with assumptions of this form. llvm-svn: 217349
2014-09-08 06:58:14 +08:00
a = __builtin_assume_aligned(a, 32, b);
return a[0];
}
Support the assume_aligned function attribute In addition to __builtin_assume_aligned, GCC also supports an assume_aligned attribute which specifies the alignment (and optional offset) of a function's return value. Here we implement support for the assume_aligned attribute by making use of the @llvm.assume intrinsic. llvm-svn: 218500
2014-09-26 13:04:30 +08:00
int *m1() __attribute__((assume_aligned(64)));
// CHECK-LABEL: @test5
int test5() {
return *m1();
clang/test/CodeGen/builtin-assume-aligned.c: Fix for -Asserts. llvm-svn: 218507
2014-09-26 17:37:15 +08:00
// CHECK: [[PTRINT5:%.+]] = ptrtoint
// CHECK: [[MASKEDPTR5:%.+]] = and i64 [[PTRINT5]], 63
// CHECK: [[MASKCOND5:%.+]] = icmp eq i64 [[MASKEDPTR5]], 0
// CHECK: call void @llvm.assume(i1 [[MASKCOND5]])
Support the assume_aligned function attribute In addition to __builtin_assume_aligned, GCC also supports an assume_aligned attribute which specifies the alignment (and optional offset) of a function's return value. Here we implement support for the assume_aligned attribute by making use of the @llvm.assume intrinsic. llvm-svn: 218500
2014-09-26 13:04:30 +08:00
}
int *m2() __attribute__((assume_aligned(64, 12)));
// CHECK-LABEL: @test6
int test6() {
return *m2();
clang/test/CodeGen/builtin-assume-aligned.c: Fix for -Asserts. llvm-svn: 218507
2014-09-26 17:37:15 +08:00
// CHECK: [[PTRINT6:%.+]] = ptrtoint
// CHECK: [[OFFSETPTR6:%.+]] = sub i64 [[PTRINT6]], 12
// CHECK: [[MASKEDPTR6:%.+]] = and i64 [[OFFSETPTR6]], 63
// CHECK: [[MASKCOND6:%.+]] = icmp eq i64 [[MASKEDPTR6]], 0
// CHECK: call void @llvm.assume(i1 [[MASKCOND6]])
Support the assume_aligned function attribute In addition to __builtin_assume_aligned, GCC also supports an assume_aligned attribute which specifies the alignment (and optional offset) of a function's return value. Here we implement support for the assume_aligned attribute by making use of the @llvm.assume intrinsic. llvm-svn: 218500
2014-09-26 13:04:30 +08:00
}