http://llvm.org/bugs/show_bug.cgi?id=3985
Summary: x86 and x86-64 don't implement the local dynamic TLS
mode.
Product: tools
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: lli
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
gcc with -fPIC on x86-64 compiles
static int __thread a;
static int __thread b;
int f(void)
{
return a + b;
}
to
leaq b...@tlsld(%rip), %rdi
call __tls_get_a...@plt
movq %rax, %rdx
movl b...@dtpoff(%rax), %eax
addl a...@dtpoff(%rdx), %eax
ret
and on X86 to
pushl %esi
pushl %ebx
call ___i686.get_pc_thunk.bx
addl $_GLOBAL_OFFSET_TABLE_, %ebx
leal b...@tlsldm(%ebx), %eax
call ___tls_get_a...@plt
movl %eax, %esi
movl b...@dtpoff(%eax), %eax
addl a...@dtpoff(%esi), %eax
popl %ebx
popl %esi
ret
note that there is only one call to ___tls_get_addr. We should implement that
on llvm.
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