https://bugs.llvm.org/show_bug.cgi?id=38593
Bug ID: 38593
Summary: -Watomic-alignment too eager?
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
$ cat <<EOF > test.c
#include <stdint.h>
uint64_t
loadSeqCst(uint64_t* addr) {
uint64_t v;
__atomic_load(addr, &v, __ATOMIC_SEQ_CST);
return v;
}
EOF
$ clang-7 -o test.o -c test.c -m32
test.c:6:3: warning: misaligned or large atomic operation may incur significant
performance penalty [-Watomic-alignment]
__atomic_load(addr, &v, __ATOMIC_SEQ_CST);
^
1 warning generated.
This seems too eager for a warning that is emitted without even passing a
-Wsomething on the command line.
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