caio/clang-p2996
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
1fbe1a8ba7672cbccd95c8a76437ef8d2c6249a2
clang-p2996/clang/test/CodeGen/atomic-ops.c
David Majnemer 0392cf892f CodeGen: Don't completely mess-up optimized atomic libcalls 
Summary:
We did a great job getting this wrong:
- We messed up which LLVM IR types to use for arguments and return values.
  The optimized libcalls use integer types for values.

  Clang attempted to use the IR type which corresponds to the value
  passed in instead of using an appropriately sized integer type.  This
  would result in violations of the ABI for, as an example, floating
  point types.
- We didn't bother recording the result of the atomic libcall in the
  destination memory.

Instead, call the functions with arguments matching the type of the
libcall prototype's parameters.

This fixes PR20780.

Differential Revision: http://reviews.llvm.org/D5098

llvm-svn: 216714
2014-08-29 07:27:49 +00:00

524 lines
18 KiB
C
Raw Blame History

// RUN: %clang_cc1 %s -emit-llvm -o - -triple=i686-apple-darwin9 | FileCheck %s
// Also test serialization of atomic operations here, to avoid duplicating the
// test.
// RUN: %clang_cc1 %s -emit-pch -o %t -triple=i686-apple-darwin9
// RUN: %clang_cc1 %s -include-pch %t -triple=i686-apple-darwin9 -emit-llvm -o - | FileCheck %s
#ifndef ALREADY_INCLUDED
#define ALREADY_INCLUDED
// Basic IRGen tests for __c11_atomic_* and GNU __atomic_*
typedef enum memory_order {
memory_order_relaxed, memory_order_consume, memory_order_acquire,
memory_order_release, memory_order_acq_rel, memory_order_seq_cst
} memory_order;
int fi1(_Atomic(int) *i) {
// CHECK-LABEL: @fi1
// CHECK: load atomic i32* {{.*}} seq_cst
return __c11_atomic_load(i, memory_order_seq_cst);
}
int fi1a(int *i) {
// CHECK-LABEL: @fi1a
// CHECK: load atomic i32* {{.*}} seq_cst
int v;
__atomic_load(i, &v, memory_order_seq_cst);
return v;
}
int fi1b(int *i) {
// CHECK-LABEL: @fi1b
// CHECK: load atomic i32* {{.*}} seq_cst
return __atomic_load_n(i, memory_order_seq_cst);
}
void fi2(_Atomic(int) *i) {
// CHECK-LABEL: @fi2
// CHECK: store atomic i32 {{.*}} seq_cst
__c11_atomic_store(i, 1, memory_order_seq_cst);
}
void fi2a(int *i) {
// CHECK-LABEL: @fi2a
// CHECK: store atomic i32 {{.*}} seq_cst
int v = 1;
__atomic_store(i, &v, memory_order_seq_cst);
}
void fi2b(int *i) {
// CHECK-LABEL: @fi2b
// CHECK: store atomic i32 {{.*}} seq_cst
__atomic_store_n(i, 1, memory_order_seq_cst);
}
int fi3(_Atomic(int) *i) {
// CHECK-LABEL: @fi3
// CHECK: atomicrmw and
// CHECK-NOT: and
return __c11_atomic_fetch_and(i, 1, memory_order_seq_cst);
}
int fi3a(int *i) {
// CHECK-LABEL: @fi3a
// CHECK: atomicrmw xor
// CHECK-NOT: xor
return __atomic_fetch_xor(i, 1, memory_order_seq_cst);
}
int fi3b(int *i) {
// CHECK-LABEL: @fi3b
// CHECK: atomicrmw add
// CHECK: add
return __atomic_add_fetch(i, 1, memory_order_seq_cst);
}
int fi3c(int *i) {
// CHECK-LABEL: @fi3c
// CHECK: atomicrmw nand
// CHECK-NOT: and
return __atomic_fetch_nand(i, 1, memory_order_seq_cst);
}
int fi3d(int *i) {
// CHECK-LABEL: @fi3d
// CHECK: atomicrmw nand
// CHECK: and
// CHECK: xor
return __atomic_nand_fetch(i, 1, memory_order_seq_cst);
}
_Bool fi4(_Atomic(int) *i) {
// CHECK-LABEL: @fi4
// CHECK: [[PAIR:%[.0-9A-Z_a-z]+]] = cmpxchg i32* [[PTR:%[.0-9A-Z_a-z]+]], i32 [[EXPECTED:%[.0-9A-Z_a-z]+]], i32 [[DESIRED:%[.0-9A-Z_a-z]+]]
// CHECK: [[OLD:%[.0-9A-Z_a-z]+]] = extractvalue { i32, i1 } [[PAIR]], 0
// CHECK: [[CMP:%[.0-9A-Z_a-z]+]] = extractvalue { i32, i1 } [[PAIR]], 1
// CHECK: br i1 [[CMP]], label %[[STORE_EXPECTED:[.0-9A-Z_a-z]+]], label %[[CONTINUE:[.0-9A-Z_a-z]+]]
// CHECK: store i32 [[OLD]]
int cmp = 0;
return __c11_atomic_compare_exchange_strong(i, &cmp, 1, memory_order_acquire, memory_order_acquire);
}
_Bool fi4a(int *i) {
// CHECK-LABEL: @fi4
// CHECK: [[PAIR:%[.0-9A-Z_a-z]+]] = cmpxchg i32* [[PTR:%[.0-9A-Z_a-z]+]], i32 [[EXPECTED:%[.0-9A-Z_a-z]+]], i32 [[DESIRED:%[.0-9A-Z_a-z]+]]
// CHECK: [[OLD:%[.0-9A-Z_a-z]+]] = extractvalue { i32, i1 } [[PAIR]], 0
// CHECK: [[CMP:%[.0-9A-Z_a-z]+]] = extractvalue { i32, i1 } [[PAIR]], 1
// CHECK: br i1 [[CMP]], label %[[STORE_EXPECTED:[.0-9A-Z_a-z]+]], label %[[CONTINUE:[.0-9A-Z_a-z]+]]
// CHECK: store i32 [[OLD]]
int cmp = 0;
int desired = 1;
return __atomic_compare_exchange(i, &cmp, &desired, 0, memory_order_acquire, memory_order_acquire);
}
_Bool fi4b(int *i) {
// CHECK-LABEL: @fi4
// CHECK: [[PAIR:%[.0-9A-Z_a-z]+]] = cmpxchg weak i32* [[PTR:%[.0-9A-Z_a-z]+]], i32 [[EXPECTED:%[.0-9A-Z_a-z]+]], i32 [[DESIRED:%[.0-9A-Z_a-z]+]]
// CHECK: [[OLD:%[.0-9A-Z_a-z]+]] = extractvalue { i32, i1 } [[PAIR]], 0
// CHECK: [[CMP:%[.0-9A-Z_a-z]+]] = extractvalue { i32, i1 } [[PAIR]], 1
// CHECK: br i1 [[CMP]], label %[[STORE_EXPECTED:[.0-9A-Z_a-z]+]], label %[[CONTINUE:[.0-9A-Z_a-z]+]]
// CHECK: store i32 [[OLD]]
int cmp = 0;
return __atomic_compare_exchange_n(i, &cmp, 1, 1, memory_order_acquire, memory_order_acquire);
}
float ff1(_Atomic(float) *d) {
// CHECK-LABEL: @ff1
// CHECK: load atomic i32* {{.*}} monotonic
return __c11_atomic_load(d, memory_order_relaxed);
}
void ff2(_Atomic(float) *d) {
// CHECK-LABEL: @ff2
// CHECK: store atomic i32 {{.*}} release
__c11_atomic_store(d, 1, memory_order_release);
}
float ff3(_Atomic(float) *d) {
return __c11_atomic_exchange(d, 2, memory_order_seq_cst);
}
struct S {
double x;
};
struct S fd1(struct S *a) {
// CHECK-LABEL: @fd1
// CHECK: [[RETVAL:%.*]] = alloca %struct.S, align 4
// CHECK: [[RET:%.*]] = alloca %struct.S, align 4
// CHECK: [[CALL:%.*]] = call i64 @__atomic_load_8(
// CHECK: [[CAST:%.*]] = bitcast %struct.S* [[RET]] to i64*
// CHECK: store i64 [[CALL]], i64* [[CAST]], align 4
struct S ret;
__atomic_load(a, &ret, memory_order_seq_cst);
return ret;
}
void fd2(struct S *a, struct S *b) {
// CHECK-LABEL: @fd2
// CHECK: [[A_ADDR:%.*]] = alloca %struct.S*, align 4
// CHECK-NEXT: [[B_ADDR:%.*]] = alloca %struct.S*, align 4
// CHECK-NEXT: store %struct.S* %a, %struct.S** [[A_ADDR]], align 4
// CHECK-NEXT: store %struct.S* %b, %struct.S** [[B_ADDR]], align 4
// CHECK-NEXT: [[LOAD_A_PTR:%.*]] = load %struct.S** [[A_ADDR]], align 4
// CHECK-NEXT: [[LOAD_B_PTR:%.*]] = load %struct.S** [[B_ADDR]], align 4
// CHECK-NEXT: [[COERCED_A:%.*]] = bitcast %struct.S* [[LOAD_A_PTR]] to i8*
// CHECK-NEXT: [[COERCED_B:%.*]] = bitcast %struct.S* [[LOAD_B_PTR]] to i64*
// CHECK-NEXT: [[LOAD_B:%.*]] = load i64* [[COERCED_B]], align 4
// CHECK-NEXT: call void @__atomic_store_8(i8* [[COERCED_A]], i64 [[LOAD_B]],
// CHECK-NEXT: ret void
__atomic_store(a, b, memory_order_seq_cst);
}
void fd3(struct S *a, struct S *b, struct S *c) {
// CHECK-LABEL: @fd3
// CHECK: [[A_ADDR:%.*]] = alloca %struct.S*, align 4
// CHECK-NEXT: [[B_ADDR:%.*]] = alloca %struct.S*, align 4
// CHECK-NEXT: [[C_ADDR:%.*]] = alloca %struct.S*, align 4
// CHECK-NEXT: store %struct.S* %a, %struct.S** [[A_ADDR]], align 4
// CHECK-NEXT: store %struct.S* %b, %struct.S** [[B_ADDR]], align 4
// CHECK-NEXT: store %struct.S* %c, %struct.S** [[C_ADDR]], align 4
// CHECK-NEXT: [[LOAD_A_PTR:%.*]] = load %struct.S** [[A_ADDR]], align 4
// CHECK-NEXT: [[LOAD_B_PTR:%.*]] = load %struct.S** [[B_ADDR]], align 4
// CHECK-NEXT: [[LOAD_C_PTR:%.*]] = load %struct.S** [[C_ADDR]], align 4
// CHECK-NEXT: [[COERCED_A:%.*]] = bitcast %struct.S* [[LOAD_A_PTR]] to i8*
// CHECK-NEXT: [[COERCED_B:%.*]] = bitcast %struct.S* [[LOAD_B_PTR]] to i64*
// CHECK-NEXT: [[LOAD_B:%.*]] = load i64* [[COERCED_B]], align 4
// CHECK-NEXT: [[CALL:%.*]] = call i64 @__atomic_exchange_8(i8* [[COERCED_A]], i64 [[LOAD_B]],
// CHECK-NEXT: [[COERCED_C:%.*]] = bitcast %struct.S* [[LOAD_C_PTR]] to i64*
// CHECK-NEXT: store i64 [[CALL]], i64* [[COERCED_C]], align 4
__atomic_exchange(a, b, c, memory_order_seq_cst);
}
_Bool fd4(struct S *a, struct S *b, struct S *c) {
// CHECK-LABEL: @fd4
// CHECK: [[A_ADDR:%.*]] = alloca %struct.S*, align 4
// CHECK-NEXT: [[B_ADDR:%.*]] = alloca %struct.S*, align 4
// CHECK-NEXT: [[C_ADDR:%.*]] = alloca %struct.S*, align 4
// CHECK: store %struct.S* %a, %struct.S** [[A_ADDR]], align 4
// CHECK-NEXT: store %struct.S* %b, %struct.S** [[B_ADDR]], align 4
// CHECK-NEXT: store %struct.S* %c, %struct.S** [[C_ADDR]], align 4
// CHECK-NEXT: [[LOAD_A_PTR:%.*]] = load %struct.S** [[A_ADDR]], align 4
// CHECK-NEXT: [[LOAD_B_PTR:%.*]] = load %struct.S** [[B_ADDR]], align 4
// CHECK-NEXT: [[LOAD_C_PTR:%.*]] = load %struct.S** [[C_ADDR]], align 4
// CHECK-NEXT: [[COERCED_A:%.*]] = bitcast %struct.S* [[LOAD_A_PTR]] to i8*
// CHECK-NEXT: [[COERCED_B:%.*]] = bitcast %struct.S* [[LOAD_B_PTR]] to i8*
// CHECK-NEXT: [[COERCED_C:%.*]] = bitcast %struct.S* [[LOAD_C_PTR]] to i64*
// CHECK-NEXT: [[LOAD_C:%.*]] = load i64* [[COERCED_C]], align 4
// CHECK-NEXT: [[CALL:%.*]] = call zeroext i1 @__atomic_compare_exchange_8(i8* [[COERCED_A]], i8* [[COERCED_B]], i64 [[LOAD_C]]
// CHECK-NEXT: ret i1 [[CALL]]
return __atomic_compare_exchange(a, b, c, 1, 5, 5);
}
int* fp1(_Atomic(int*) *p) {
// CHECK-LABEL: @fp1
// CHECK: load atomic i32* {{.*}} seq_cst
return __c11_atomic_load(p, memory_order_seq_cst);
}
int* fp2(_Atomic(int*) *p) {
// CHECK-LABEL: @fp2
// CHECK: store i32 4
// CHECK: atomicrmw add {{.*}} monotonic
return __c11_atomic_fetch_add(p, 1, memory_order_relaxed);
}
int *fp2a(int **p) {
// CHECK-LABEL: @fp2a
// CHECK: store i32 4
// CHECK: atomicrmw sub {{.*}} monotonic
// Note, the GNU builtins do not multiply by sizeof(T)!
return __atomic_fetch_sub(p, 4, memory_order_relaxed);
}
_Complex float fc(_Atomic(_Complex float) *c) {
// CHECK-LABEL: @fc
// CHECK: atomicrmw xchg i64*
return __c11_atomic_exchange(c, 2, memory_order_seq_cst);
}
typedef struct X { int x; } X;
X fs(_Atomic(X) *c) {
// CHECK-LABEL: @fs
// CHECK: atomicrmw xchg i32*
return __c11_atomic_exchange(c, (X){2}, memory_order_seq_cst);
}
X fsa(X *c, X *d) {
// CHECK-LABEL: @fsa
// CHECK: atomicrmw xchg i32*
X ret;
__atomic_exchange(c, d, &ret, memory_order_seq_cst);
return ret;
}
_Bool fsb(_Bool *c) {
// CHECK-LABEL: @fsb
// CHECK: atomicrmw xchg i8*
return __atomic_exchange_n(c, 1, memory_order_seq_cst);
}
char flag1;
volatile char flag2;
void test_and_set() {
// CHECK: atomicrmw xchg i8* @flag1, i8 1 seq_cst
__atomic_test_and_set(&flag1, memory_order_seq_cst);
// CHECK: atomicrmw volatile xchg i8* @flag2, i8 1 acquire
__atomic_test_and_set(&flag2, memory_order_acquire);
// CHECK: store atomic volatile i8 0, i8* @flag2 release
__atomic_clear(&flag2, memory_order_release);
// CHECK: store atomic i8 0, i8* @flag1 seq_cst
__atomic_clear(&flag1, memory_order_seq_cst);
}
struct Sixteen {
char c[16];
} sixteen;
struct Seventeen {
char c[17];
} seventeen;
int lock_free(struct Incomplete *incomplete) {
// CHECK-LABEL: @lock_free
// CHECK: call i32 @__atomic_is_lock_free(i32 3, i8* null)
__c11_atomic_is_lock_free(3);
// CHECK: call i32 @__atomic_is_lock_free(i32 16, i8* {{.*}}@sixteen{{.*}})
__atomic_is_lock_free(16, &sixteen);
// CHECK: call i32 @__atomic_is_lock_free(i32 17, i8* {{.*}}@seventeen{{.*}})
__atomic_is_lock_free(17, &seventeen);
// CHECK: call i32 @__atomic_is_lock_free(i32 4, {{.*}})
__atomic_is_lock_free(4, incomplete);
char cs[20];
// CHECK: call i32 @__atomic_is_lock_free(i32 4, {{.*}})
__atomic_is_lock_free(4, cs+1);
// CHECK-NOT: call
__atomic_always_lock_free(3, 0);
__atomic_always_lock_free(16, 0);
__atomic_always_lock_free(17, 0);
__atomic_always_lock_free(16, &sixteen);
__atomic_always_lock_free(17, &seventeen);
int n;
__atomic_is_lock_free(4, &n);
// CHECK: ret i32 1
return __c11_atomic_is_lock_free(sizeof(_Atomic(int)));
}
// Tests for atomic operations on big values. These should call the functions
// defined here:
// http://gcc.gnu.org/wiki/Atomic/GCCMM/LIbrary#The_Library_interface
struct foo {
int big[128];
};
struct bar {
char c[3];
};
struct bar smallThing, thing1, thing2;
struct foo bigThing;
_Atomic(struct foo) bigAtomic;
void structAtomicStore() {
// CHECK-LABEL: @structAtomicStore
struct foo f = {0};
struct bar b = {0};
__atomic_store(&smallThing, &b, 5);
// CHECK: call void @__atomic_store(i32 3, i8* {{.*}} @smallThing
__atomic_store(&bigThing, &f, 5);
// CHECK: call void @__atomic_store(i32 512, i8* {{.*}} @bigThing
}
void structAtomicLoad() {
// CHECK-LABEL: @structAtomicLoad
struct bar b;
__atomic_load(&smallThing, &b, 5);
// CHECK: call void @__atomic_load(i32 3, i8* {{.*}} @smallThing
struct foo f = {0};
__atomic_load(&bigThing, &f, 5);
// CHECK: call void @__atomic_load(i32 512, i8* {{.*}} @bigThing
}
struct foo structAtomicExchange() {
// CHECK-LABEL: @structAtomicExchange
struct foo f = {0};
struct foo old;
__atomic_exchange(&f, &bigThing, &old, 5);
// CHECK: call void @__atomic_exchange(i32 512, {{.*}}, i8* bitcast ({{.*}} @bigThing to i8*),
return __c11_atomic_exchange(&bigAtomic, f, 5);
// CHECK: call void @__atomic_exchange(i32 512, i8* bitcast ({{.*}} @bigAtomic to i8*),
}
int structAtomicCmpExchange() {
// CHECK-LABEL: @structAtomicCmpExchange
_Bool x = __atomic_compare_exchange(&smallThing, &thing1, &thing2, 1, 5, 5);
// CHECK: call zeroext i1 @__atomic_compare_exchange(i32 3, {{.*}} @smallThing{{.*}} @thing1{{.*}} @thing2
struct foo f = {0};
struct foo g = {0};
g.big[12] = 12;
return x & __c11_atomic_compare_exchange_strong(&bigAtomic, &f, g, 5, 5);
// CHECK: call zeroext i1 @__atomic_compare_exchange(i32 512, i8* bitcast ({{.*}} @bigAtomic to i8*),
}
// Check that no atomic operations are used in any initialisation of _Atomic
// types.
_Atomic(int) atomic_init_i = 42;
// CHECK-LABEL: @atomic_init_foo
void atomic_init_foo()
{
// CHECK-NOT: }
// CHECK-NOT: atomic
// CHECK: store
_Atomic(int) j = 12;
// CHECK-NOT: }
// CHECK-NOT: atomic
// CHECK: store
__c11_atomic_init(&j, 42);
// CHECK-NOT: atomic
// CHECK: }
}
// CHECK-LABEL: @failureOrder
void failureOrder(_Atomic(int) *ptr, int *ptr2) {
__c11_atomic_compare_exchange_strong(ptr, ptr2, 43, memory_order_acquire, memory_order_relaxed);
// CHECK: cmpxchg i32* {{%[0-9A-Za-z._]+}}, i32 {{%[0-9A-Za-z._]+}}, i32 {{%[0-9A-Za-z_.]+}} acquire monotonic
__c11_atomic_compare_exchange_weak(ptr, ptr2, 43, memory_order_seq_cst, memory_order_acquire);
// CHECK: cmpxchg weak i32* {{%[0-9A-Za-z._]+}}, i32 {{%[0-9A-Za-z._]+}}, i32 {{%[0-9A-Za-z_.]+}} seq_cst acquire
// Unknown ordering: conservatively pick strongest valid option (for now!).
__atomic_compare_exchange(ptr2, ptr2, ptr2, 0, memory_order_acq_rel, *ptr2);
// CHECK: cmpxchg i32* {{%[0-9A-Za-z._]+}}, i32 {{%[0-9A-Za-z._]+}}, i32 {{%[0-9A-Za-z_.]+}} acq_rel acquire
// Undefined behaviour: don't really care what that last ordering is so leave
// it out:
__atomic_compare_exchange_n(ptr2, ptr2, 43, 1, memory_order_seq_cst, 42);
// CHECK: cmpxchg weak i32* {{%[0-9A-Za-z._]+}}, i32 {{%[0-9A-Za-z._]+}}, i32 {{%[0-9A-Za-z_.]+}} seq_cst
}
// CHECK-LABEL: @generalFailureOrder
void generalFailureOrder(_Atomic(int) *ptr, int *ptr2, int success, int fail) {
__c11_atomic_compare_exchange_strong(ptr, ptr2, 42, success, fail);
// CHECK: switch i32 {{.*}}, label %[[MONOTONIC:[0-9a-zA-Z._]+]] [
// CHECK-NEXT: i32 1, label %[[ACQUIRE:[0-9a-zA-Z._]+]]
// CHECK-NEXT: i32 2, label %[[ACQUIRE]]
// CHECK-NEXT: i32 3, label %[[RELEASE:[0-9a-zA-Z._]+]]
// CHECK-NEXT: i32 4, label %[[ACQREL:[0-9a-zA-Z._]+]]
// CHECK-NEXT: i32 5, label %[[SEQCST:[0-9a-zA-Z._]+]]
// CHECK: [[MONOTONIC]]
// CHECK: switch {{.*}}, label %[[MONOTONIC_MONOTONIC:[0-9a-zA-Z._]+]] [
// CHECK-NEXT: ]
// CHECK: [[ACQUIRE]]
// CHECK: switch {{.*}}, label %[[ACQUIRE_MONOTONIC:[0-9a-zA-Z._]+]] [
// CHECK-NEXT: i32 1, label %[[ACQUIRE_ACQUIRE:[0-9a-zA-Z._]+]]
// CHECK-NEXT: i32 2, label %[[ACQUIRE_ACQUIRE:[0-9a-zA-Z._]+]]
// CHECK-NEXT: ]
// CHECK: [[RELEASE]]
// CHECK: switch {{.*}}, label %[[RELEASE_MONOTONIC:[0-9a-zA-Z._]+]] [
// CHECK-NEXT: ]
// CHECK: [[ACQREL]]
// CHECK: switch {{.*}}, label %[[ACQREL_MONOTONIC:[0-9a-zA-Z._]+]] [
// CHECK-NEXT: i32 1, label %[[ACQREL_ACQUIRE:[0-9a-zA-Z._]+]]
// CHECK-NEXT: i32 2, label %[[ACQREL_ACQUIRE:[0-9a-zA-Z._]+]]
// CHECK-NEXT: ]
// CHECK: [[SEQCST]]
// CHECK: switch {{.*}}, label %[[SEQCST_MONOTONIC:[0-9a-zA-Z._]+]] [
// CHECK-NEXT: i32 1, label %[[SEQCST_ACQUIRE:[0-9a-zA-Z._]+]]
// CHECK-NEXT: i32 2, label %[[SEQCST_ACQUIRE:[0-9a-zA-Z._]+]]
// CHECK-NEXT: i32 5, label %[[SEQCST_SEQCST:[0-9a-zA-Z._]+]]
// CHECK-NEXT: ]
// CHECK: [[MONOTONIC_MONOTONIC]]
// CHECK: cmpxchg {{.*}} monotonic monotonic
// CHECK: br
// CHECK: [[ACQUIRE_MONOTONIC]]
// CHECK: cmpxchg {{.*}} acquire monotonic
// CHECK: br
// CHECK: [[ACQUIRE_ACQUIRE]]
// CHECK: cmpxchg {{.*}} acquire acquire
// CHECK: br
// CHECK: [[ACQREL_MONOTONIC]]
// CHECK: cmpxchg {{.*}} acq_rel monotonic
// CHECK: br
// CHECK: [[ACQREL_ACQUIRE]]
// CHECK: cmpxchg {{.*}} acq_rel acquire
// CHECK: br
// CHECK: [[SEQCST_MONOTONIC]]
// CHECK: cmpxchg {{.*}} seq_cst monotonic
// CHECK: br
// CHECK: [[SEQCST_ACQUIRE]]
// CHECK: cmpxchg {{.*}} seq_cst acquire
// CHECK: br
// CHECK: [[SEQCST_SEQCST]]
// CHECK: cmpxchg {{.*}} seq_cst seq_cst
// CHECK: br
}
void generalWeakness(int *ptr, int *ptr2, _Bool weak) {
__atomic_compare_exchange_n(ptr, ptr2, 42, weak, memory_order_seq_cst, memory_order_seq_cst);
// CHECK: switch i1 {{.*}}, label %[[WEAK:[0-9a-zA-Z._]+]] [
// CHECK-NEXT: i1 false, label %[[STRONG:[0-9a-zA-Z._]+]]
// CHECK: [[STRONG]]
// CHECK-NOT: br
// CHECK: cmpxchg {{.*}} seq_cst seq_cst
// CHECK: br
// CHECK: [[WEAK]]
// CHECK-NOT: br
// CHECK: cmpxchg weak {{.*}} seq_cst seq_cst
// CHECK: br
}
// Having checked the flow in the previous two cases, we'll trust clang to
// combine them sanely.
void EMIT_ALL_THE_THINGS(int *ptr, int *ptr2, int new, _Bool weak, int success, int fail) {
__atomic_compare_exchange(ptr, ptr2, &new, weak, success, fail);
// CHECK: = cmpxchg {{.*}} monotonic monotonic
// CHECK: = cmpxchg weak {{.*}} monotonic monotonic
// CHECK: = cmpxchg {{.*}} acquire monotonic
// CHECK: = cmpxchg {{.*}} acquire acquire
// CHECK: = cmpxchg weak {{.*}} acquire monotonic
// CHECK: = cmpxchg weak {{.*}} acquire acquire
// CHECK: = cmpxchg {{.*}} release monotonic
// CHECK: = cmpxchg weak {{.*}} release monotonic
// CHECK: = cmpxchg {{.*}} acq_rel monotonic
// CHECK: = cmpxchg {{.*}} acq_rel acquire
// CHECK: = cmpxchg weak {{.*}} acq_rel monotonic
// CHECK: = cmpxchg weak {{.*}} acq_rel acquire
// CHECK: = cmpxchg {{.*}} seq_cst monotonic
// CHECK: = cmpxchg {{.*}} seq_cst acquire
// CHECK: = cmpxchg {{.*}} seq_cst seq_cst
// CHECK: = cmpxchg weak {{.*}} seq_cst monotonic
// CHECK: = cmpxchg weak {{.*}} seq_cst acquire
// CHECK: = cmpxchg weak {{.*}} seq_cst seq_cst
}
#endif
Reference in New Issue View Git Blame Copy Permalink