[LLVMbugs] [Bug 10930] New: llc generates wrong assembler code for the MIPS target for signed long long

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10930

           Summary: llc generates wrong assembler code for the MIPS target
                    for signed long long
           Product: new-bugs
           Version: 2.9
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: gordon.haak at googlemail.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=7271)
 --> (http://llvm.org/bugs/attachment.cgi?id=7271)
The LLC output

The following C-code was compiled with clang 2.9 (no options):

int main() {
  signed long long a = 2147483648;
  if ((a >= 0) && (a > 15))
  {
    return 0;
  }
  return -1;
}

llc (options -march=mips) produces the output (see attachment)

This code is incorrect, since the address calculation in line 22 ("ori $3, $3,
4") is wrong ($3 should point to the lower word of the variable which is not
guaranteed with an "ori"). An "addiu $3, $3, 4") would be correct instead.

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