[LLVMbugs] [Bug 2682] New: llvm-gcc fails to find that an argument to __builtin_prefetch is a constant

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2682

           Summary: llvm-gcc fails to find that an argument to
                    __builtin_prefetch is a constant
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: llvm-gcc
        AssignedTo: rafael.espindola at gmail.com
        ReportedBy: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu


the function

-------------------------------------------
void prefetch(const char *x, int hint) {
  if (__builtin_constant_p(hint)) {
    __builtin_prefetch(x, 0, hint);
  }
}
------------------------------------------

is a valid. Except in the case it is inlined, it is equivalent to

-------------------------------------------
void prefetch(const char *x, int hint) {
  if (0) {
    __builtin_prefetch(x, 0, hint);
  }
}
------------------------------------------

llvm-gcc fails to compile it:

testcase.i: In function 'prefetch':
testcase.i:1: error: third argument to '__builtin_prefetch' must be a constant

the version with "if (0)" compiles correctly.


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