[mips] Implement sge/sgeu pseudo instructions

The `sge/sgeu Dst, Src1, Src2/Imm` pseudo instructions set register
`Dst` to 1 if register `Src1` is greater than or equal `Src2/Imm` and
to 0 otherwise.

Differential Revision: https://reviews.llvm.org/D64314

llvm-svn: 365476

3 files changed, 147 insertions, 0 deletions

diff --git a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
index 928b8edd310..0d968674faa 100644
--- a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
+++ b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
@@ -275,6 +275,12 @@ class MipsAsmParser : public MCTargetAsmParser {
   bool expandUxw(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                  const MCSubtargetInfo *STI);
 
+  bool expandSge(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
+                 const MCSubtargetInfo *STI);
+
+  bool expandSgeImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
+                    const MCSubtargetInfo *STI);
+
   bool expandSgtImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                     const MCSubtargetInfo *STI);
 
@@ -2476,6 +2482,14 @@ MipsAsmParser::tryExpandInstruction(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
   case Mips::NORImm:
   case Mips::NORImm64:
     return expandAliasImmediate(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
+  case Mips::SGE:
+  case Mips::SGEU:
+    return expandSge(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
+  case Mips::SGEImm:
+  case Mips::SGEUImm:
+  case Mips::SGEImm64:
+  case Mips::SGEUImm64:
+    return expandSgeImm(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
   case Mips::SGTImm:
   case Mips::SGTUImm:
   case Mips::SGTImm64:
@@ -4293,6 +4307,96 @@ bool MipsAsmParser::expandUxw(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
   return false;
 }
 
+bool MipsAsmParser::expandSge(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
+                              const MCSubtargetInfo *STI) {
+  MipsTargetStreamer &TOut = getTargetStreamer();
+
+  assert(Inst.getNumOperands() == 3 && "Invalid operand count");
+  assert(Inst.getOperand(0).isReg() &&
+         Inst.getOperand(1).isReg() &&
+         Inst.getOperand(2).isReg() && "Invalid instruction operand.");
+
+  unsigned DstReg = Inst.getOperand(0).getReg();
+  unsigned SrcReg = Inst.getOperand(1).getReg();
+  unsigned OpReg = Inst.getOperand(2).getReg();
+  unsigned OpCode;
+
+  warnIfNoMacro(IDLoc);
+
+  switch (Inst.getOpcode()) {
+  case Mips::SGE:
+    OpCode = Mips::SLT;
+    break;
+  case Mips::SGEU:
+    OpCode = Mips::SLTu;
+    break;
+  default:
+    llvm_unreachable("unexpected 'sge' opcode");
+  }
+
+  // $SrcReg >= $OpReg is equal to (not ($SrcReg < $OpReg))
+  TOut.emitRRR(OpCode, DstReg, SrcReg, OpReg, IDLoc, STI);
+  TOut.emitRRI(Mips::XORi, DstReg, DstReg, 1, IDLoc, STI);
+
+  return false;
+}
+
+bool MipsAsmParser::expandSgeImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
+                                 const MCSubtargetInfo *STI) {
+  MipsTargetStreamer &TOut = getTargetStreamer();
+
+  assert(Inst.getNumOperands() == 3 && "Invalid operand count");
+  assert(Inst.getOperand(0).isReg() &&
+         Inst.getOperand(1).isReg() &&
+         Inst.getOperand(2).isImm() && "Invalid instruction operand.");
+
+  unsigned DstReg = Inst.getOperand(0).getReg();
+  unsigned SrcReg = Inst.getOperand(1).getReg();
+  int64_t ImmValue = Inst.getOperand(2).getImm();
+  unsigned OpRegCode, OpImmCode;
+
+  warnIfNoMacro(IDLoc);
+
+  switch (Inst.getOpcode()) {
+  case Mips::SGEImm:
+  case Mips::SGEImm64:
+    OpRegCode = Mips::SLT;
+    OpImmCode = Mips::SLTi;
+    break;
+  case Mips::SGEUImm:
+  case Mips::SGEUImm64:
+    OpRegCode = Mips::SLTu;
+    OpImmCode = Mips::SLTiu;
+    break;
+  default:
+    llvm_unreachable("unexpected 'sge' opcode with immediate");
+  }
+
+  // $SrcReg >= Imm is equal to (not ($SrcReg < Imm))
+  if (isInt<16>(ImmValue)) {
+    // Use immediate version of STL.
+    TOut.emitRRI(OpImmCode, DstReg, SrcReg, ImmValue, IDLoc, STI);
+    TOut.emitRRI(Mips::XORi, DstReg, DstReg, 1, IDLoc, STI);
+  } else {
+    unsigned ImmReg = DstReg;
+    if (DstReg == SrcReg) {
+      unsigned ATReg = getATReg(Inst.getLoc());
+      if (!ATReg)
+        return true;
+      ImmReg = ATReg;
+    }
+
+    if (loadImmediate(ImmValue, ImmReg, Mips::NoRegister, isInt<32>(ImmValue),
+                      false, IDLoc, Out, STI))
+      return true;
+
+    TOut.emitRRR(OpRegCode, DstReg, SrcReg, ImmReg, IDLoc, STI);
+    TOut.emitRRI(Mips::XORi, DstReg, DstReg, 1, IDLoc, STI);
+  }
+
+  return false;
+}
+
 bool MipsAsmParser::expandSgtImm(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
                                  const MCSubtargetInfo *STI) {
   MipsTargetStreamer &TOut = getTargetStreamer();
diff --git a/llvm/lib/Target/Mips/Mips64InstrInfo.td b/llvm/lib/Target/Mips/Mips64InstrInfo.td
index 2e8de5e09eb..b5711004f70 100644
--- a/llvm/lib/Target/Mips/Mips64InstrInfo.td
+++ b/llvm/lib/Target/Mips/Mips64InstrInfo.td
@@ -1155,6 +1155,20 @@ def SLTUImm64 : MipsAsmPseudoInst<(outs GPR64Opnd:$rs),
 def : MipsInstAlias<"sltu\t$rs, $imm", (SLTUImm64 GPR64Opnd:$rs, GPR64Opnd:$rs,
                                                   imm64:$imm)>, GPR_64;
 
+def SGEImm64 : MipsAsmPseudoInst<(outs GPR64Opnd:$rd),
+                                 (ins GPR64Opnd:$rs, imm64:$imm),
+                                 "sge\t$rd, $rs, $imm">, GPR_64;
+def : MipsInstAlias<"sge $rs, $imm", (SGEImm64 GPR64Opnd:$rs,
+                                               GPR64Opnd:$rs,
+                                               imm64:$imm), 0>, GPR_64;
+
+def SGEUImm64 : MipsAsmPseudoInst<(outs GPR64Opnd:$rd),
+                                  (ins GPR64Opnd:$rs, imm64:$imm),
+                                  "sgeu\t$rd, $rs, $imm">, GPR_64;
+def : MipsInstAlias<"sgeu $rs, $imm", (SGEUImm64 GPR64Opnd:$rs,
+                                                 GPR64Opnd:$rs,
+                                                 imm64:$imm), 0>, GPR_64;
+
 def SGTImm64 : MipsAsmPseudoInst<(outs GPR64Opnd:$rd),
                                  (ins GPR64Opnd:$rs, imm64:$imm),
                                  "sgt\t$rd, $rs, $imm">, GPR_64;
diff --git a/llvm/lib/Target/Mips/MipsInstrInfo.td b/llvm/lib/Target/Mips/MipsInstrInfo.td
index f17218acf40..ab353c92e27 100644
--- a/llvm/lib/Target/Mips/MipsInstrInfo.td
+++ b/llvm/lib/Target/Mips/MipsInstrInfo.td
@@ -2693,6 +2693,35 @@ let AdditionalPredicates = [NotInMicroMips] in {
                       (SUBu GPR32Opnd:$rt, ZERO, GPR32Opnd:$rs), 1>, ISA_MIPS1;
   def : MipsInstAlias<"negu $rt",
                       (SUBu GPR32Opnd:$rt, ZERO, GPR32Opnd:$rt), 1>, ISA_MIPS1;
+
+  def SGE : MipsAsmPseudoInst<(outs GPR32Opnd:$rd),
+                              (ins GPR32Opnd:$rs, GPR32Opnd:$rt),
+                              "sge\t$rd, $rs, $rt">, ISA_MIPS1;
+  def : MipsInstAlias<"sge $rs, $rt",
+                      (SGE GPR32Opnd:$rs, GPR32Opnd:$rs, GPR32Opnd:$rt), 0>,
+        ISA_MIPS1;
+  def SGEImm : MipsAsmPseudoInst<(outs GPR32Opnd:$rd),
+                                 (ins GPR32Opnd:$rs, simm32:$imm),
+                                 "sge\t$rd, $rs, $imm">, GPR_32;
+  def : MipsInstAlias<"sge $rs, $imm", (SGEImm GPR32Opnd:$rs,
+                                               GPR32Opnd:$rs,
+                                               simm32:$imm), 0>,
+        GPR_32;
+
+  def SGEU : MipsAsmPseudoInst<(outs GPR32Opnd:$rd),
+                               (ins GPR32Opnd:$rs, GPR32Opnd:$rt),
+                               "sgeu\t$rd, $rs, $rt">, ISA_MIPS1;
+  def : MipsInstAlias<"sgeu $rs, $rt",
+                      (SGEU GPR32Opnd:$rs, GPR32Opnd:$rs, GPR32Opnd:$rt), 0>,
+        ISA_MIPS1;
+  def SGEUImm : MipsAsmPseudoInst<(outs GPR32Opnd:$rd),
+                                  (ins GPR32Opnd:$rs, uimm32_coerced:$imm),
+                                  "sgeu\t$rd, $rs, $imm">, GPR_32;
+  def : MipsInstAlias<"sgeu $rs, $imm", (SGEUImm GPR32Opnd:$rs,
+                                                 GPR32Opnd:$rs,
+                                                 uimm32_coerced:$imm), 0>,
+        GPR_32;
+
   def : MipsInstAlias<
           "sgt $rd, $rs, $rt",
           (SLT GPR32Opnd:$rd, GPR32Opnd:$rt, GPR32Opnd:$rs), 0>, ISA_MIPS1;