Revert "X86: Align the stack on word boundaries in LowerFormalArguments()"

[oota-llvm.git] / lib / Target / X86 / X86FastISel.cpp

diff --git a/lib/Target/X86/X86FastISel.cpp b/lib/Target/X86/X86FastISel.cpp
index 6426d27ae1a152699e08c4e097708ffa02214af8..16e57a0f6f52111f3cd5e645351d83529b44aadb 100644 (file)
--- a/lib/Target/X86/X86FastISel.cpp
+++ b/lib/Target/X86/X86FastISel.cpp
@@ -3107,6 +3107,29 @@ unsigned X86FastISel::X86MaterializeInt(const ConstantInt *CI, MVT VT) {
     return 0;
 
   uint64_t Imm = CI->getZExtValue();
+  if (Imm == 0) {
+    unsigned SrcReg = FastEmitInst_(X86::MOV32r0, &X86::GR32RegClass);
+    switch (VT.SimpleTy) {
+    default: llvm_unreachable("Unexpected value type");
+    case MVT::i1:
+    case MVT::i8:
+      return FastEmitInst_extractsubreg(MVT::i8, SrcReg, /*Kill=*/true,
+                                        X86::sub_8bit);
+    case MVT::i16:
+      return FastEmitInst_extractsubreg(MVT::i16, SrcReg, /*Kill=*/true,
+                                        X86::sub_16bit);
+    case MVT::i32:
+      return SrcReg;
+    case MVT::i64: {
+      unsigned ResultReg = createResultReg(&X86::GR64RegClass);
+      BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
+              TII.get(TargetOpcode::SUBREG_TO_REG), ResultReg)
+        .addImm(0).addReg(SrcReg).addImm(X86::sub_32bit);
+      return ResultReg;
+    }
+    }
+  }
+
   unsigned Opc = 0;
   switch (VT.SimpleTy) {
   default: llvm_unreachable("Unexpected value type");
@@ -3140,7 +3163,8 @@ unsigned X86FastISel::X86MaterializeFP(const ConstantFP *CFP, MVT VT) {
     return TargetMaterializeFloatZero(CFP);
 
   // Can't handle alternate code models yet.
-  if (TM.getCodeModel() != CodeModel::Small)
+  CodeModel::Model CM = TM.getCodeModel();
+  if (CM != CodeModel::Small && CM != CodeModel::Large)
     return 0;
 
   // Get opcode and regclass of the output for the given load instruction.
@@ -3196,6 +3220,21 @@ unsigned X86FastISel::X86MaterializeFP(const ConstantFP *CFP, MVT VT) {
   unsigned CPI = MCP.getConstantPoolIndex(CFP, Align);
   unsigned ResultReg = createResultReg(RC);
 
+  if (CM == CodeModel::Large) {
+    unsigned AddrReg = createResultReg(&X86::GR64RegClass);
+    BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(X86::MOV64ri),
+            AddrReg)
+      .addConstantPoolIndex(CPI, 0, OpFlag);
+    MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
+                                      TII.get(Opc), ResultReg);
+    addDirectMem(MIB, AddrReg);
+    MachineMemOperand *MMO = FuncInfo.MF->getMachineMemOperand(
+      MachinePointerInfo::getConstantPool(), MachineMemOperand::MOLoad,
+      TM.getSubtargetImpl()->getDataLayout()->getPointerSize(), Align);
+    MIB->addMemOperand(*FuncInfo.MF, MMO);
+    return ResultReg;
+  }
+
   addConstantPoolReference(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
                                    TII.get(Opc), ResultReg),
                            CPI, PICBase, OpFlag);