r218905 - Add __sync_fetch_and_nand (again)
Hal Finkel
hfinkel at anl.gov
Thu Oct 2 13:53:50 PDT 2014
Author: hfinkel
Date: Thu Oct 2 15:53:50 2014
New Revision: 218905
URL: http://llvm.org/viewvc/llvm-project?rev=218905&view=rev
Log:
Add __sync_fetch_and_nand (again)
Prior to GCC 4.4, __sync_fetch_and_nand was implemented as:
{ tmp = *ptr; *ptr = ~tmp & value; return tmp; }
but this was changed in GCC 4.4 to be:
{ tmp = *ptr; *ptr = ~(tmp & value); return tmp; }
in response to this change, support for sync_fetch_and_nand (and
sync_nand_and_fetch) was removed in r99522 in order to avoid miscompiling code
depending on the old semantics. However, at this point:
1. Many years have passed, and the amount of code relying on the old
semantics is likely smaller.
2. Through the work of many contributors, all LLVM backends have been updated
such that "atomicrmw nand" provides the newer GCC 4.4+ semantics (this process
was complete July of 2014 (added to the release notes in r212635).
3. The lack of this intrinsic is now a needless impediment to porting codes
from GCC to Clang (I've now seen several examples of this).
It is true, however, that we still set GNUC_MINOR to 2 (corresponding to GCC
4.2). To compensate for this, and to address the original concern regarding
code relying on the old semantics, I've added a warning that specifically
details the fact that the semantics have changed and that we provide the newer
semantics.
Fixes PR8842.
Modified:
cfe/trunk/include/clang/Basic/Builtins.def
cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
cfe/trunk/lib/CodeGen/CGBuiltin.cpp
cfe/trunk/lib/Sema/SemaChecking.cpp
cfe/trunk/test/CodeGen/Atomics.c
cfe/trunk/test/CodeGen/atomic.c
cfe/trunk/test/Sema/builtins.c
Modified: cfe/trunk/include/clang/Basic/Builtins.def
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/Builtins.def?rev=218905&r1=218904&r2=218905&view=diff
==============================================================================
--- cfe/trunk/include/clang/Basic/Builtins.def (original)
+++ cfe/trunk/include/clang/Basic/Builtins.def Thu Oct 2 15:53:50 2014
@@ -541,6 +541,12 @@ BUILTIN(__sync_fetch_and_xor_4, "iiD*i."
BUILTIN(__sync_fetch_and_xor_8, "LLiLLiD*LLi.", "tn")
BUILTIN(__sync_fetch_and_xor_16, "LLLiLLLiD*LLLi.", "tn")
+BUILTIN(__sync_fetch_and_nand, "v.", "t")
+BUILTIN(__sync_fetch_and_nand_1, "ccD*c.", "tn")
+BUILTIN(__sync_fetch_and_nand_2, "ssD*s.", "tn")
+BUILTIN(__sync_fetch_and_nand_4, "iiD*i.", "tn")
+BUILTIN(__sync_fetch_and_nand_8, "LLiLLiD*LLi.", "tn")
+BUILTIN(__sync_fetch_and_nand_16, "LLLiLLLiD*LLLi.", "tn")
BUILTIN(__sync_add_and_fetch, "v.", "t")
BUILTIN(__sync_add_and_fetch_1, "ccD*c.", "tn")
@@ -577,6 +583,13 @@ BUILTIN(__sync_xor_and_fetch_4, "iiD*i."
BUILTIN(__sync_xor_and_fetch_8, "LLiLLiD*LLi.", "tn")
BUILTIN(__sync_xor_and_fetch_16, "LLLiLLLiD*LLLi.", "tn")
+BUILTIN(__sync_nand_and_fetch, "v.", "t")
+BUILTIN(__sync_nand_and_fetch_1, "ccD*c.", "tn")
+BUILTIN(__sync_nand_and_fetch_2, "ssD*s.", "tn")
+BUILTIN(__sync_nand_and_fetch_4, "iiD*i.", "tn")
+BUILTIN(__sync_nand_and_fetch_8, "LLiLLiD*LLi.", "tn")
+BUILTIN(__sync_nand_and_fetch_16, "LLLiLLLiD*LLLi.", "tn")
+
BUILTIN(__sync_bool_compare_and_swap, "v.", "t")
BUILTIN(__sync_bool_compare_and_swap_1, "bcD*cc.", "tn")
BUILTIN(__sync_bool_compare_and_swap_2, "bsD*ss.", "tn")
Modified: cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td?rev=218905&r1=218904&r2=218905&view=diff
==============================================================================
--- cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td (original)
+++ cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td Thu Oct 2 15:53:50 2014
@@ -6898,6 +6898,11 @@ def warn_duplicate_attribute : Warning<
"attribute %0 is already applied with different parameters">,
InGroup<IgnoredAttributes>;
+def warn_sync_fetch_and_nand_semantics_change : Warning<
+ "the semantics of this intrinsic changed with GCC "
+ "version 4.4 - the newer semantics are provided here">,
+ InGroup<DiagGroup<"sync-fetch-and-nand-semantics-changed">>;
+
// Type
def ext_invalid_sign_spec : Extension<"'%0' cannot be signed or unsigned">;
def warn_receiver_forward_class : Warning<
Modified: cfe/trunk/lib/CodeGen/CGBuiltin.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGBuiltin.cpp?rev=218905&r1=218904&r2=218905&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CGBuiltin.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGBuiltin.cpp Thu Oct 2 15:53:50 2014
@@ -113,7 +113,8 @@ static RValue EmitBinaryAtomic(CodeGenFu
static RValue EmitBinaryAtomicPost(CodeGenFunction &CGF,
llvm::AtomicRMWInst::BinOp Kind,
const CallExpr *E,
- Instruction::BinaryOps Op) {
+ Instruction::BinaryOps Op,
+ bool Invert = false) {
QualType T = E->getType();
assert(E->getArg(0)->getType()->isPointerType());
assert(CGF.getContext().hasSameUnqualifiedType(T,
@@ -138,6 +139,9 @@ static RValue EmitBinaryAtomicPost(CodeG
CGF.Builder.CreateAtomicRMW(Kind, Args[0], Args[1],
llvm::SequentiallyConsistent);
Result = CGF.Builder.CreateBinOp(Op, Result, Args[1]);
+ if (Invert)
+ Result = CGF.Builder.CreateBinOp(llvm::Instruction::Xor, Result,
+ llvm::ConstantInt::get(IntType, -1));
Result = EmitFromInt(CGF, Result, T, ValueType);
return RValue::get(Result);
}
@@ -879,11 +883,13 @@ RValue CodeGenFunction::EmitBuiltinExpr(
case Builtin::BI__sync_fetch_and_or:
case Builtin::BI__sync_fetch_and_and:
case Builtin::BI__sync_fetch_and_xor:
+ case Builtin::BI__sync_fetch_and_nand:
case Builtin::BI__sync_add_and_fetch:
case Builtin::BI__sync_sub_and_fetch:
case Builtin::BI__sync_and_and_fetch:
case Builtin::BI__sync_or_and_fetch:
case Builtin::BI__sync_xor_and_fetch:
+ case Builtin::BI__sync_nand_and_fetch:
case Builtin::BI__sync_val_compare_and_swap:
case Builtin::BI__sync_bool_compare_and_swap:
case Builtin::BI__sync_lock_test_and_set:
@@ -920,6 +926,12 @@ RValue CodeGenFunction::EmitBuiltinExpr(
case Builtin::BI__sync_fetch_and_xor_8:
case Builtin::BI__sync_fetch_and_xor_16:
return EmitBinaryAtomic(*this, llvm::AtomicRMWInst::Xor, E);
+ case Builtin::BI__sync_fetch_and_nand_1:
+ case Builtin::BI__sync_fetch_and_nand_2:
+ case Builtin::BI__sync_fetch_and_nand_4:
+ case Builtin::BI__sync_fetch_and_nand_8:
+ case Builtin::BI__sync_fetch_and_nand_16:
+ return EmitBinaryAtomic(*this, llvm::AtomicRMWInst::Nand, E);
// Clang extensions: not overloaded yet.
case Builtin::BI__sync_fetch_and_min:
@@ -966,6 +978,13 @@ RValue CodeGenFunction::EmitBuiltinExpr(
case Builtin::BI__sync_xor_and_fetch_16:
return EmitBinaryAtomicPost(*this, llvm::AtomicRMWInst::Xor, E,
llvm::Instruction::Xor);
+ case Builtin::BI__sync_nand_and_fetch_1:
+ case Builtin::BI__sync_nand_and_fetch_2:
+ case Builtin::BI__sync_nand_and_fetch_4:
+ case Builtin::BI__sync_nand_and_fetch_8:
+ case Builtin::BI__sync_nand_and_fetch_16:
+ return EmitBinaryAtomicPost(*this, llvm::AtomicRMWInst::Nand, E,
+ llvm::Instruction::And, true);
case Builtin::BI__sync_val_compare_and_swap_1:
case Builtin::BI__sync_val_compare_and_swap_2:
Modified: cfe/trunk/lib/Sema/SemaChecking.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaChecking.cpp?rev=218905&r1=218904&r2=218905&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaChecking.cpp (original)
+++ cfe/trunk/lib/Sema/SemaChecking.cpp Thu Oct 2 15:53:50 2014
@@ -273,6 +273,12 @@ Sema::CheckBuiltinFunctionCall(FunctionD
case Builtin::BI__sync_fetch_and_xor_4:
case Builtin::BI__sync_fetch_and_xor_8:
case Builtin::BI__sync_fetch_and_xor_16:
+ case Builtin::BI__sync_fetch_and_nand:
+ case Builtin::BI__sync_fetch_and_nand_1:
+ case Builtin::BI__sync_fetch_and_nand_2:
+ case Builtin::BI__sync_fetch_and_nand_4:
+ case Builtin::BI__sync_fetch_and_nand_8:
+ case Builtin::BI__sync_fetch_and_nand_16:
case Builtin::BI__sync_add_and_fetch:
case Builtin::BI__sync_add_and_fetch_1:
case Builtin::BI__sync_add_and_fetch_2:
@@ -303,6 +309,12 @@ Sema::CheckBuiltinFunctionCall(FunctionD
case Builtin::BI__sync_xor_and_fetch_4:
case Builtin::BI__sync_xor_and_fetch_8:
case Builtin::BI__sync_xor_and_fetch_16:
+ case Builtin::BI__sync_nand_and_fetch:
+ case Builtin::BI__sync_nand_and_fetch_1:
+ case Builtin::BI__sync_nand_and_fetch_2:
+ case Builtin::BI__sync_nand_and_fetch_4:
+ case Builtin::BI__sync_nand_and_fetch_8:
+ case Builtin::BI__sync_nand_and_fetch_16:
case Builtin::BI__sync_val_compare_and_swap:
case Builtin::BI__sync_val_compare_and_swap_1:
case Builtin::BI__sync_val_compare_and_swap_2:
@@ -1518,12 +1530,14 @@ Sema::SemaBuiltinAtomicOverloaded(ExprRe
BUILTIN_ROW(__sync_fetch_and_or),
BUILTIN_ROW(__sync_fetch_and_and),
BUILTIN_ROW(__sync_fetch_and_xor),
+ BUILTIN_ROW(__sync_fetch_and_nand),
BUILTIN_ROW(__sync_add_and_fetch),
BUILTIN_ROW(__sync_sub_and_fetch),
BUILTIN_ROW(__sync_and_and_fetch),
BUILTIN_ROW(__sync_or_and_fetch),
BUILTIN_ROW(__sync_xor_and_fetch),
+ BUILTIN_ROW(__sync_nand_and_fetch),
BUILTIN_ROW(__sync_val_compare_and_swap),
BUILTIN_ROW(__sync_bool_compare_and_swap),
@@ -1553,6 +1567,7 @@ Sema::SemaBuiltinAtomicOverloaded(ExprRe
// as the number of fixed args.
unsigned BuiltinID = FDecl->getBuiltinID();
unsigned BuiltinIndex, NumFixed = 1;
+ bool WarnAboutSemanticsChange = false;
switch (BuiltinID) {
default: llvm_unreachable("Unknown overloaded atomic builtin!");
case Builtin::BI__sync_fetch_and_add:
@@ -1600,13 +1615,23 @@ Sema::SemaBuiltinAtomicOverloaded(ExprRe
BuiltinIndex = 4;
break;
+ case Builtin::BI__sync_fetch_and_nand:
+ case Builtin::BI__sync_fetch_and_nand_1:
+ case Builtin::BI__sync_fetch_and_nand_2:
+ case Builtin::BI__sync_fetch_and_nand_4:
+ case Builtin::BI__sync_fetch_and_nand_8:
+ case Builtin::BI__sync_fetch_and_nand_16:
+ BuiltinIndex = 5;
+ WarnAboutSemanticsChange = true;
+ break;
+
case Builtin::BI__sync_add_and_fetch:
case Builtin::BI__sync_add_and_fetch_1:
case Builtin::BI__sync_add_and_fetch_2:
case Builtin::BI__sync_add_and_fetch_4:
case Builtin::BI__sync_add_and_fetch_8:
case Builtin::BI__sync_add_and_fetch_16:
- BuiltinIndex = 5;
+ BuiltinIndex = 6;
break;
case Builtin::BI__sync_sub_and_fetch:
@@ -1615,7 +1640,7 @@ Sema::SemaBuiltinAtomicOverloaded(ExprRe
case Builtin::BI__sync_sub_and_fetch_4:
case Builtin::BI__sync_sub_and_fetch_8:
case Builtin::BI__sync_sub_and_fetch_16:
- BuiltinIndex = 6;
+ BuiltinIndex = 7;
break;
case Builtin::BI__sync_and_and_fetch:
@@ -1624,7 +1649,7 @@ Sema::SemaBuiltinAtomicOverloaded(ExprRe
case Builtin::BI__sync_and_and_fetch_4:
case Builtin::BI__sync_and_and_fetch_8:
case Builtin::BI__sync_and_and_fetch_16:
- BuiltinIndex = 7;
+ BuiltinIndex = 8;
break;
case Builtin::BI__sync_or_and_fetch:
@@ -1633,7 +1658,7 @@ Sema::SemaBuiltinAtomicOverloaded(ExprRe
case Builtin::BI__sync_or_and_fetch_4:
case Builtin::BI__sync_or_and_fetch_8:
case Builtin::BI__sync_or_and_fetch_16:
- BuiltinIndex = 8;
+ BuiltinIndex = 9;
break;
case Builtin::BI__sync_xor_and_fetch:
@@ -1642,7 +1667,17 @@ Sema::SemaBuiltinAtomicOverloaded(ExprRe
case Builtin::BI__sync_xor_and_fetch_4:
case Builtin::BI__sync_xor_and_fetch_8:
case Builtin::BI__sync_xor_and_fetch_16:
- BuiltinIndex = 9;
+ BuiltinIndex = 10;
+ break;
+
+ case Builtin::BI__sync_nand_and_fetch:
+ case Builtin::BI__sync_nand_and_fetch_1:
+ case Builtin::BI__sync_nand_and_fetch_2:
+ case Builtin::BI__sync_nand_and_fetch_4:
+ case Builtin::BI__sync_nand_and_fetch_8:
+ case Builtin::BI__sync_nand_and_fetch_16:
+ BuiltinIndex = 11;
+ WarnAboutSemanticsChange = true;
break;
case Builtin::BI__sync_val_compare_and_swap:
@@ -1651,7 +1686,7 @@ Sema::SemaBuiltinAtomicOverloaded(ExprRe
case Builtin::BI__sync_val_compare_and_swap_4:
case Builtin::BI__sync_val_compare_and_swap_8:
case Builtin::BI__sync_val_compare_and_swap_16:
- BuiltinIndex = 10;
+ BuiltinIndex = 12;
NumFixed = 2;
break;
@@ -1661,7 +1696,7 @@ Sema::SemaBuiltinAtomicOverloaded(ExprRe
case Builtin::BI__sync_bool_compare_and_swap_4:
case Builtin::BI__sync_bool_compare_and_swap_8:
case Builtin::BI__sync_bool_compare_and_swap_16:
- BuiltinIndex = 11;
+ BuiltinIndex = 13;
NumFixed = 2;
ResultType = Context.BoolTy;
break;
@@ -1672,7 +1707,7 @@ Sema::SemaBuiltinAtomicOverloaded(ExprRe
case Builtin::BI__sync_lock_test_and_set_4:
case Builtin::BI__sync_lock_test_and_set_8:
case Builtin::BI__sync_lock_test_and_set_16:
- BuiltinIndex = 12;
+ BuiltinIndex = 14;
break;
case Builtin::BI__sync_lock_release:
@@ -1681,7 +1716,7 @@ Sema::SemaBuiltinAtomicOverloaded(ExprRe
case Builtin::BI__sync_lock_release_4:
case Builtin::BI__sync_lock_release_8:
case Builtin::BI__sync_lock_release_16:
- BuiltinIndex = 13;
+ BuiltinIndex = 15;
NumFixed = 0;
ResultType = Context.VoidTy;
break;
@@ -1692,7 +1727,7 @@ Sema::SemaBuiltinAtomicOverloaded(ExprRe
case Builtin::BI__sync_swap_4:
case Builtin::BI__sync_swap_8:
case Builtin::BI__sync_swap_16:
- BuiltinIndex = 14;
+ BuiltinIndex = 16;
break;
}
@@ -1705,6 +1740,11 @@ Sema::SemaBuiltinAtomicOverloaded(ExprRe
return ExprError();
}
+ if (WarnAboutSemanticsChange) {
+ Diag(TheCall->getLocEnd(), diag::warn_sync_fetch_and_nand_semantics_change)
+ << TheCall->getCallee()->getSourceRange();
+ }
+
// Get the decl for the concrete builtin from this, we can tell what the
// concrete integer type we should convert to is.
unsigned NewBuiltinID = BuiltinIndices[BuiltinIndex][SizeIndex];
Modified: cfe/trunk/test/CodeGen/Atomics.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/Atomics.c?rev=218905&r1=218904&r2=218905&view=diff
==============================================================================
--- cfe/trunk/test/CodeGen/Atomics.c (original)
+++ cfe/trunk/test/CodeGen/Atomics.c Thu Oct 2 15:53:50 2014
@@ -49,6 +49,15 @@ void test_op_ignore (void) // CHECK-LABE
(void) __sync_fetch_and_xor (&sll, 1); // CHECK: atomicrmw xor i64
(void) __sync_fetch_and_xor (&ull, 1); // CHECK: atomicrmw xor i64
+ (void) __sync_fetch_and_nand (&sc, 1); // CHECK: atomicrmw nand i8
+ (void) __sync_fetch_and_nand (&uc, 1); // CHECK: atomicrmw nand i8
+ (void) __sync_fetch_and_nand (&ss, 1); // CHECK: atomicrmw nand i16
+ (void) __sync_fetch_and_nand (&us, 1); // CHECK: atomicrmw nand i16
+ (void) __sync_fetch_and_nand (&si, 1); // CHECK: atomicrmw nand i32
+ (void) __sync_fetch_and_nand (&ui, 1); // CHECK: atomicrmw nand i32
+ (void) __sync_fetch_and_nand (&sll, 1); // CHECK: atomicrmw nand i64
+ (void) __sync_fetch_and_nand (&ull, 1); // CHECK: atomicrmw nand i64
+
(void) __sync_fetch_and_and (&sc, 1); // CHECK: atomicrmw and i8
(void) __sync_fetch_and_and (&uc, 1); // CHECK: atomicrmw and i8
(void) __sync_fetch_and_and (&ss, 1); // CHECK: atomicrmw and i16
@@ -98,6 +107,15 @@ void test_fetch_and_op (void) // CHECK-L
sll = __sync_fetch_and_xor (&sll, 11); // CHECK: atomicrmw xor
ull = __sync_fetch_and_xor (&ull, 11); // CHECK: atomicrmw xor
+ sc = __sync_fetch_and_nand (&sc, 11); // CHECK: atomicrmw nand
+ uc = __sync_fetch_and_nand (&uc, 11); // CHECK: atomicrmw nand
+ ss = __sync_fetch_and_nand (&ss, 11); // CHECK: atomicrmw nand
+ us = __sync_fetch_and_nand (&us, 11); // CHECK: atomicrmw nand
+ si = __sync_fetch_and_nand (&si, 11); // CHECK: atomicrmw nand
+ ui = __sync_fetch_and_nand (&ui, 11); // CHECK: atomicrmw nand
+ sll = __sync_fetch_and_nand (&sll, 11); // CHECK: atomicrmw nand
+ ull = __sync_fetch_and_nand (&ull, 11); // CHECK: atomicrmw nand
+
sc = __sync_fetch_and_and (&sc, 11); // CHECK: atomicrmw and
uc = __sync_fetch_and_and (&uc, 11); // CHECK: atomicrmw and
ss = __sync_fetch_and_and (&ss, 11); // CHECK: atomicrmw and
@@ -147,6 +165,31 @@ void test_op_and_fetch (void)
sll = __sync_xor_and_fetch (&sll, uc); // CHECK: atomicrmw xor
ull = __sync_xor_and_fetch (&ull, uc); // CHECK: atomicrmw xor
+ sc = __sync_nand_and_fetch (&sc, uc); // CHECK: atomicrmw nand
+ // CHECK: and
+ // CHECK: xor
+ uc = __sync_nand_and_fetch (&uc, uc); // CHECK: atomicrmw nand
+ // CHECK: and
+ // CHECK: xor
+ ss = __sync_nand_and_fetch (&ss, uc); // CHECK: atomicrmw nand
+ // CHECK: and
+ // CHECK: xor
+ us = __sync_nand_and_fetch (&us, uc); // CHECK: atomicrmw nand
+ // CHECK: and
+ // CHECK: xor
+ si = __sync_nand_and_fetch (&si, uc); // CHECK: atomicrmw nand
+ // CHECK: and
+ // CHECK: xor
+ ui = __sync_nand_and_fetch (&ui, uc); // CHECK: atomicrmw nand
+ // CHECK: and
+ // CHECK: xor
+ sll = __sync_nand_and_fetch (&sll, uc); // CHECK: atomicrmw nand
+ // CHECK: and
+ // CHECK: xor
+ ull = __sync_nand_and_fetch (&ull, uc); // CHECK: atomicrmw nand
+ // CHECK: and
+ // CHECK: xor
+
sc = __sync_and_and_fetch (&sc, uc); // CHECK: atomicrmw and
uc = __sync_and_and_fetch (&uc, uc); // CHECK: atomicrmw and
ss = __sync_and_and_fetch (&ss, uc); // CHECK: atomicrmw and
Modified: cfe/trunk/test/CodeGen/atomic.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/atomic.c?rev=218905&r1=218904&r2=218905&view=diff
==============================================================================
--- cfe/trunk/test/CodeGen/atomic.c (original)
+++ cfe/trunk/test/CodeGen/atomic.c Thu Oct 2 15:53:50 2014
@@ -50,7 +50,10 @@ int atomic(void) {
old = __sync_fetch_and_xor(&val, 0xb);
// CHECK: atomicrmw xor i32* %val, i32 11 seq_cst
-
+
+ old = __sync_fetch_and_nand(&val, 0xc);
+ // CHECK: atomicrmw nand i32* %val, i32 12 seq_cst
+
old = __sync_add_and_fetch(&val, 1);
// CHECK: atomicrmw add i32* %val, i32 1 seq_cst
@@ -65,7 +68,10 @@ int atomic(void) {
old = __sync_xor_and_fetch(&valc, 5);
// CHECK: atomicrmw xor i8* %valc, i8 5 seq_cst
-
+
+ old = __sync_nand_and_fetch(&valc, 6);
+ // CHECK: atomicrmw nand i8* %valc, i8 6 seq_cst
+
__sync_val_compare_and_swap((void **)0, (void *)0, (void *)0);
// CHECK: [[PAIR:%[a-z0-9_.]+]] = cmpxchg i32* null, i32 0, i32 0 seq_cst
// CHECK: extractvalue { i32, i1 } [[PAIR]], 0
Modified: cfe/trunk/test/Sema/builtins.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Sema/builtins.c?rev=218905&r1=218904&r2=218905&view=diff
==============================================================================
--- cfe/trunk/test/Sema/builtins.c (original)
+++ cfe/trunk/test/Sema/builtins.c Thu Oct 2 15:53:50 2014
@@ -66,6 +66,11 @@ void test9_3(volatile int* ptr, int val)
__sync_fetch_and_add_4(ptr, val);
}
+void test9_4(volatile int* ptr, int val) {
+ // expected-warning at +1 {{the semantics of this intrinsic changed with GCC version 4.4 - the newer semantics are provided here}}
+ __sync_fetch_and_nand(ptr, val);
+}
+
// rdar://7236819
void test10(void) __attribute__((noreturn));
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