[LLVMbugs] [Bug 22676] New: PC-relative address isn't used for x32

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Feb 24 09:56:51 PST 2015


            Bug ID: 22676
           Summary: PC-relative address isn't used for x32
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: hjl.tools at gmail.com
                CC: llvmbugs at cs.uiuc.edu, michael.m.kuperstein at intel.com
    Classification: Unclassified

X86DAGToDAGISel::SelectTLSADDRAddr has

  if (N.getValueType() == MVT::i32) {
    AM.Scale = 1; 
    AM.IndexReg = CurDAG->getRegister(X86::EBX, MVT::i32);
  } else {
    AM.IndexReg = CurDAG->getRegister(0, MVT::i64);

N.getValueType() returns MVT::i32 for x32.  One way to fix it
is to check Subtarget->is64Bit() and use

AM.IndexReg = CurDAG->getRegister(0, N.getValueType());

for 64-bit target.

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