From 15b81b51d64b04c71aa75788fcc418f52ec8b181 Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Tue, 5 Apr 2011 17:24:25 +0000
Subject: [PATCH] Convert ADCS and SBCS instructions into pseudos that are
 expanded to the ADC/ABC with the appropriate S-bit input value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128892 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMExpandPseudoInsts.cpp | 47 +++++++++++++++++++++++
 lib/Target/ARM/ARMInstrInfo.td          | 50 +++++--------------------
 2 files changed, 56 insertions(+), 41 deletions(-)

diff --git a/lib/Target/ARM/ARMExpandPseudoInsts.cpp b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
index a14c9526fc2..547b27d4866 100644
--- a/lib/Target/ARM/ARMExpandPseudoInsts.cpp
+++ b/lib/Target/ARM/ARMExpandPseudoInsts.cpp
@@ -55,6 +55,7 @@ namespace {
     void ExpandVLD(MachineBasicBlock::iterator &MBBI);
     void ExpandVST(MachineBasicBlock::iterator &MBBI);
     void ExpandLaneOp(MachineBasicBlock::iterator &MBBI);
+    void ExpandSBitOp(MachineBasicBlock::iterator &MBBI);
     void ExpandVTBL(MachineBasicBlock::iterator &MBBI,
                     unsigned Opc, bool IsExt, unsigned NumRegs);
     void ExpandMOV32BitImm(MachineBasicBlock &MBB,
@@ -629,6 +630,43 @@ void ARMExpandPseudo::ExpandVTBL(MachineBasicBlock::iterator &MBBI,
   MI.eraseFromParent();
 }
 
+void ARMExpandPseudo::ExpandSBitOp(MachineBasicBlock::iterator &MBBI) {
+  MachineInstr &MI = *MBBI;
+  MachineBasicBlock &MBB = *MI.getParent();
+  unsigned OldOpc = MI.getOpcode();
+  unsigned Opc = 0;
+  switch (OldOpc) {
+    case ARM::ADCSSrr:
+      Opc = ARM::ADCrr;
+      break;
+    case ARM::ADCSSri:
+      Opc = ARM::ADCri;
+      break;
+    case ARM::ADCSSrs:
+      Opc = ARM::ADCrs;
+      break;
+    case ARM::SBCSSrr:
+      Opc = ARM::SBCrr;
+      break;
+    case ARM::SBCSSri:
+      Opc = ARM::SBCri;
+      break;
+    case ARM::SBCSSrs:
+      Opc = ARM::SBCrs;
+      break;
+    default:
+      llvm_unreachable("Unknown opcode?");
+  }
+
+  MachineInstrBuilder MIB = BuildMI(MBB, MBBI, MI.getDebugLoc(), TII->get(Opc));
+  MIB.addOperand(MachineOperand::CreateImm(0)); // Predicate
+  MIB.addOperand(MachineOperand::CreateImm(0)); // S bit
+  for (unsigned i = 0; i < MI.getNumOperands(); ++i)
+    MIB.addOperand(MI.getOperand(i));
+  TransferImpOps(MI, MIB, MIB);
+  MI.eraseFromParent();
+}
+
 void ARMExpandPseudo::ExpandMOV32BitImm(MachineBasicBlock &MBB,
                                         MachineBasicBlock::iterator &MBBI) {
   MachineInstr &MI = *MBBI;
@@ -941,6 +979,15 @@ bool ARMExpandPseudo::ExpandMI(MachineBasicBlock &MBB,
       ExpandMOV32BitImm(MBB, MBBI);
       return true;
 
+    case ARM::ADCSSri:
+    case ARM::ADCSSrr:
+    case ARM::ADCSSrs:
+    case ARM::SBCSSri:
+    case ARM::SBCSSrr:
+    case ARM::SBCSSrs:
+      ExpandSBitOp(MBBI);
+      return true;
+
     case ARM::VMOVQQ: {
       unsigned DstReg = MI.getOperand(0).getReg();
       bool DstIsDead = MI.getOperand(0).isDead();
diff --git a/lib/Target/ARM/ARMInstrInfo.td b/lib/Target/ARM/ARMInstrInfo.td
index 8f9783cf645..2cf458a0680 100644
--- a/lib/Target/ARM/ARMInstrInfo.td
+++ b/lib/Target/ARM/ARMInstrInfo.td
@@ -938,50 +938,18 @@ multiclass AI1_adde_sube_irs<bits<4> opcod, string opc, PatFrag opnode,
 let isCodeGenOnly = 1, Defs = [CPSR] in {
 multiclass AI1_adde_sube_s_irs<bits<4> opcod, string opc, PatFrag opnode,
                              bit Commutable = 0> {
-  def Sri : AXI1<opcod, (outs GPR:$Rd), (ins GPR:$Rn, so_imm:$imm),
-                DPFrm, IIC_iALUi, !strconcat(opc, "\t$Rd, $Rn, $imm"),
+  def Sri : ARMPseudoInst<(outs GPR:$Rd), (ins GPR:$Rn, so_imm:$imm),
+                Size4Bytes, IIC_iALUi,
                [(set GPR:$Rd, (opnode GPR:$Rn, so_imm:$imm))]>,
-               Requires<[IsARM]> {
-    bits<4> Rd;
-    bits<4> Rn;
-    bits<12> imm;
-    let Inst{31-27} = 0b1110; // non-predicated
-    let Inst{15-12} = Rd;
-    let Inst{19-16} = Rn;
-    let Inst{11-0} = imm;
-    let Inst{20} = 1;
-    let Inst{25} = 1;
-  }
-  def Srr : AXI1<opcod, (outs GPR:$Rd), (ins GPR:$Rn, GPR:$Rm),
-                DPFrm, IIC_iALUr, !strconcat(opc, "\t$Rd, $Rn, $Rm"),
+               Requires<[IsARM]>;
+  def Srr : ARMPseudoInst<(outs GPR:$Rd), (ins GPR:$Rn, GPR:$Rm),
+                Size4Bytes, IIC_iALUr,
                [(set GPR:$Rd, (opnode GPR:$Rn, GPR:$Rm))]>,
-               Requires<[IsARM]> {
-    bits<4> Rd;
-    bits<4> Rn;
-    bits<4> Rm;
-    let Inst{31-27} = 0b1110; // non-predicated
-    let Inst{11-4} = 0b00000000;
-    let isCommutable = Commutable;
-    let Inst{3-0} = Rm;
-    let Inst{15-12} = Rd;
-    let Inst{19-16} = Rn;
-    let Inst{20} = 1;
-    let Inst{25} = 0;
-  }
-  def Srs : AXI1<opcod, (outs GPR:$Rd), (ins GPR:$Rn, so_reg:$shift),
-                DPSoRegFrm, IIC_iALUsr, !strconcat(opc, "\t$Rd, $Rn, $shift"),
+               Requires<[IsARM]>;
+  def Srs : ARMPseudoInst<(outs GPR:$Rd), (ins GPR:$Rn, so_reg:$shift),
+                Size4Bytes, IIC_iALUsr,
                [(set GPR:$Rd, (opnode GPR:$Rn, so_reg:$shift))]>,
-               Requires<[IsARM]> {
-    bits<4> Rd;
-    bits<4> Rn;
-    bits<12> shift;
-    let Inst{31-27} = 0b1110; // non-predicated
-    let Inst{11-0} = shift;
-    let Inst{15-12} = Rd;
-    let Inst{19-16} = Rn;
-    let Inst{20} = 1;
-    let Inst{25} = 0;
-  }
+               Requires<[IsARM]>;
 }
 }
 }
-- 
2.34.1