http://llvm.org/bugs/show_bug.cgi?id=6475
Summary: Inline asm bug with atomic_exchange_and_add
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P5
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Clang fails to compile the following reduce testcase:
inline int atomic_exchange_and_add( int * pw, int dv )
{
int r;
__asm__ __volatile__
(
"lock\n\t"
"xadd %1, %0":
"=m"( *pw ), "=r"( r ):
"m"( *pw ), "1"( dv ):
"memory", "cc"
);
return r;
}
void release() {
int use_count_;
if( atomic_exchange_and_add( &use_count_, -1 ) == 1 ) { }
}
with the following error:
Stack dump:
0. Program arguments: /home/gonzo/bin/clang -cc1 -triple i386-pc-linux-gnu
-S -disable-free -disable-llvm-verifier -main-file-name bla3.cc
-mrelocation-model static -mdisable-fp-elim -mconstructor-aliases -target-cpu
pentium4 -resource-dir /home/gonzo/lib/clang/1.1 -fmessage-length 177
-fexceptions -fgnu-runtime -fdiagnostics-show-option -fcolor-diagnostics -o
/tmp/cc-zTnd86.s -x c++ bla3.cc
1. <eof> parser at end of file
2. Code generation
3. Running pass 'X86 DAG->DAG Instruction Selection' on function
'@_Z23atomic_exchange_and_addPii'
clang: error: compiler command failed due to signal 11 (use -v to see
invocation)
This is clang version 02ebc and llvm version eb6e04 on Ubuntu 9.10.
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