http://llvm.org/bugs/show_bug.cgi?id=19428
Bug ID: 19428
Summary: intrinsic function __sync_lock_test_and_set does not
generate code for int128
Product: clang
Version: 3.4
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Test case:
__int128 tas128(volatile __int128 *ptr, __int128 new_value)
{
return __sync_lock_test_and_set(ptr, new_value);
}
clang -mcx16 atomic.c && nm atomic.o
Shows undefined external symbol for __sync_lock_test_and_set_16
Same code with int64_t works fine; inline code for
__sync_lock_test_and_set_8 is generated.
On gcc-4.8, the 128-bit atomic operation does generate assembly
to use cmpxchg16b as hoped.
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