[LLVMbugs] [Bug 19844] New: We should probably support threadLocalMode in aliases

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19844

            Bug ID: 19844
           Summary: We should probably support threadLocalMode in aliases
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Core LLVM classes
          Assignee: unassignedbugs at nondot.org
          Reporter: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

given
------------------------------------

__thread int a = 42;
extern __thread int b __attribute__((tls_model("local-dynamic"), alias("a")));
int *f(void) {
  return &a;
}
int *g(void) {
  return &b;
}
-----------------------------------

gcc will produce

 leaq    a at tlsgd(%rip), %rdi

 leaq    b at tlsld(%rip), %rdi

Given the current class layout this will probably mean moving threadLocalMode
to GlobalValue and asserting it is NotThreadLocal for functions.

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