ARM: support expanding external symbols in 32-bit moves

This enhances the expansion of the mov32imm pseudo-instruction to support an
external symbol reference.  This is motivated by a simplification of the stack
probe emission for Windows on ARM (and fixing a leak).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207736 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/ARM/ARMExpandPseudoInsts.cpp b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
index 72a9b648dca7caffd7642cde618f7c8062604885..93357fe525ad4a910962e889895b9dabf1a49309 100644 (file)
--- a/lib/Target/ARM/ARMExpandPseudoInsts.cpp
+++ b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
@@ -705,17 +705,29 @@ void ARMExpandPseudo::ExpandMOV32BitImm(MachineBasicBlock &MBB,
     .addReg(DstReg, RegState::Define | getDeadRegState(DstIsDead))
     .addReg(DstReg);
 
-  if (MO.isImm()) {
+  switch (MO.getType()) {
+  case MachineOperand::MO_Immediate: {
     unsigned Imm = MO.getImm();
     unsigned Lo16 = Imm & 0xffff;
     unsigned Hi16 = (Imm >> 16) & 0xffff;
     LO16 = LO16.addImm(Lo16);
     HI16 = HI16.addImm(Hi16);
-  } else {
+    break;
+  }
+  case MachineOperand::MO_ExternalSymbol: {
+    const char *ES = MO.getSymbolName();
+    unsigned TF = MO.getTargetFlags();
+    LO16 = LO16.addExternalSymbol(ES, TF | ARMII::MO_LO16);
+    HI16 = HI16.addExternalSymbol(ES, TF | ARMII::MO_HI16);
+    break;
+  }
+  default: {
     const GlobalValue *GV = MO.getGlobal();
     unsigned TF = MO.getTargetFlags();
     LO16 = LO16.addGlobalAddress(GV, MO.getOffset(), TF | ARMII::MO_LO16);
     HI16 = HI16.addGlobalAddress(GV, MO.getOffset(), TF | ARMII::MO_HI16);
+    break;
+  }
   }
 
   LO16->setMemRefs(MI.memoperands_begin(), MI.memoperands_end());