Expand mips16 SelT form pseudso/macros.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175862 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/Mips16InstrInfo.td

@@ -392,6 +392,7 @@ class SeliT<string op1, string op2>:
                !strconcat(op1, "\t.+4\n\tmove $rd, $rs"))), []> {
   let isCodeGenOnly=1;
   let Constraints = "$rd = $rd_";
+  let usesCustomInserter = 1;
 }
 
 //

lib/Target/Mips/MipsISelLowering.cpp

@@ -1298,6 +1298,71 @@ MachineBasicBlock *MipsTargetLowering::EmitSel16(unsigned Opc, MachineInstr *MI,
   return BB;
 }
 
+MachineBasicBlock *MipsTargetLowering::EmitSelT16
+  (unsigned Opc1, unsigned Opc2,
+   MachineInstr *MI, MachineBasicBlock *BB) const {
+  if (DontExpandCondPseudos16)
+    return BB;
+  const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
+  DebugLoc dl = MI->getDebugLoc();
+  // To "insert" a SELECT_CC instruction, we actually have to insert the
+  // diamond control-flow pattern.  The incoming instruction knows the
+  // destination vreg to set, the condition code register to branch on, the
+  // true/false values to select between, and a branch opcode to use.
+  const BasicBlock *LLVM_BB = BB->getBasicBlock();
+  MachineFunction::iterator It = BB;
+  ++It;
+
+  //  thisMBB:
+  //  ...
+  //   TrueVal = ...
+  //   setcc r1, r2, r3
+  //   bNE   r1, r0, copy1MBB
+  //   fallthrough --> copy0MBB
+  MachineBasicBlock *thisMBB  = BB;
+  MachineFunction *F = BB->getParent();
+  MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
+  MachineBasicBlock *sinkMBB  = F->CreateMachineBasicBlock(LLVM_BB);
+  F->insert(It, copy0MBB);
+  F->insert(It, sinkMBB);
+
+  // Transfer the remainder of BB and its successor edges to sinkMBB.
+  sinkMBB->splice(sinkMBB->begin(), BB,
+                  llvm::next(MachineBasicBlock::iterator(MI)),
+                  BB->end());
+  sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
+
+  // Next, add the true and fallthrough blocks as its successors.
+  BB->addSuccessor(copy0MBB);
+  BB->addSuccessor(sinkMBB);
+
+  BuildMI(BB, dl, TII->get(Opc2)).addReg(MI->getOperand(3).getReg())
+    .addImm(MI->getOperand(4).getImm());
+  BuildMI(BB, dl, TII->get(Opc1)).addMBB(sinkMBB);
+
+  //  copy0MBB:
+  //   %FalseValue = ...
+  //   # fallthrough to sinkMBB
+  BB = copy0MBB;
+
+  // Update machine-CFG edges
+  BB->addSuccessor(sinkMBB);
+
+  //  sinkMBB:
+  //   %Result = phi [ %TrueValue, thisMBB ], [ %FalseValue, copy0MBB ]
+  //  ...
+  BB = sinkMBB;
+
+  BuildMI(*BB, BB->begin(), dl,
+          TII->get(Mips::PHI), MI->getOperand(0).getReg())
+    .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB)
+    .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB);
+
+  MI->eraseFromParent();   // The pseudo instruction is gone now.
+  return BB;
+
+}
+
 MachineBasicBlock *
 MipsTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
                                                 MachineBasicBlock *BB) const {
@@ -1413,6 +1478,18 @@ MipsTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
     return EmitSel16(Mips::BeqzRxImm16, MI, BB);
   case Mips::SelBneZ:
     return EmitSel16(Mips::BnezRxImm16, MI, BB);
+  case Mips::SelTBteqZCmpi:
+    return EmitSelT16(Mips::BteqzX16, Mips::CmpiRxImmX16, MI, BB);
+  case Mips::SelTBteqZSlti:
+    return EmitSelT16(Mips::BteqzX16, Mips::SltiRxImmX16, MI, BB);
+  case Mips::SelTBteqZSltiu:
+    return EmitSelT16(Mips::BteqzX16, Mips::SltiuRxImmX16, MI, BB);
+  case Mips::SelTBtneZCmpi:
+    return EmitSelT16(Mips::BtnezX16, Mips::CmpiRxImmX16, MI, BB);
+  case Mips::SelTBtneZSlti:
+    return EmitSelT16(Mips::BtnezX16, Mips::SltiRxImmX16, MI, BB);
+  case Mips::SelTBtneZSltiu:
+    return EmitSelT16(Mips::BtnezX16, Mips::SltiuRxImmX16, MI, BB);
   }
 }
 

lib/Target/Mips/MipsISelLowering.h

@@ -406,6 +406,9 @@ namespace llvm {
                                   MachineBasicBlock *BB, unsigned Size) const;
     MachineBasicBlock *EmitSel16(unsigned Opc, MachineInstr *MI,
                                  MachineBasicBlock *BB) const;
+    MachineBasicBlock *EmitSelT16(unsigned Opc1, unsigned Opc2,
+                                  MachineInstr *MI,
+                                  MachineBasicBlock *BB) const;
 
   };
 }

test/CodeGen/Mips/selTBteqzCmpi.ll

@@ -0,0 +1,26 @@
+; RUN: llc -march=mipsel -mcpu=mips16 -relocation-model=pic < %s | FileCheck %s -check-prefix=16
+
+@i = global i32 1, align 4
+@j = global i32 2, align 4
+@a = global i32 5, align 4
+@.str = private unnamed_addr constant [8 x i8] c"%i = 2\0A\00", align 1
+@k = common global i32 0, align 4
+
+define void @t() nounwind "target-cpu"="mips16" "target-features"="+mips16,+o32" {
+entry:
+  %0 = load i32* @a, align 4
+  %cmp = icmp eq i32 %0, 10
+  %1 = load i32* @i, align 4
+  %2 = load i32* @j, align 4
+  %cond = select i1 %cmp, i32 %1, i32 %2
+  store i32 %cond, i32* @i, align 4
+  ret void
+}
+
+attributes #0 = { nounwind "target-cpu"="mips16" "target-features"="+mips16,+o32" }
+
+
+; 16:	cmpi	${{[0-9]+}}, 10
+; 16:	bteqz	$BB{{[0-9]+}}_{{[0-9]}}
+
+

test/CodeGen/Mips/selTBtnezCmpi.ll

@@ -0,0 +1,26 @@
+; RUN: llc -march=mipsel -mcpu=mips16 -relocation-model=pic < %s | FileCheck %s -check-prefix=16
+
+@i = global i32 1, align 4
+@j = global i32 2, align 4
+@a = global i32 5, align 4
+@.str = private unnamed_addr constant [8 x i8] c"%i = 1\0A\00", align 1
+@k = common global i32 0, align 4
+
+define void @t() nounwind "target-cpu"="mips16" "target-features"="+mips16,+o32" {
+entry:
+  %0 = load i32* @a, align 4
+  %cmp = icmp ne i32 %0, 10
+  %1 = load i32* @i, align 4
+  %2 = load i32* @j, align 4
+  %cond = select i1 %cmp, i32 %1, i32 %2
+  store i32 %cond, i32* @i, align 4
+  ret void
+}
+
+; 16:	cmpi	${{[0-9]+}}, 10
+; 16:	btnez	$BB{{[0-9]+}}_{{[0-9]}}
+
+
+attributes #0 = { nounwind "target-cpu"="mips16" "target-features"="+mips16,+o32" }
+
+

test/CodeGen/Mips/selTBtnezSlti.ll

@@ -0,0 +1,25 @@
+; RUN: llc -march=mipsel -mcpu=mips16 -relocation-model=pic < %s | FileCheck %s -check-prefix=16
+
+@i = global i32 1, align 4
+@j = global i32 2, align 4
+@a = global i32 5, align 4
+@.str = private unnamed_addr constant [9 x i8] c"%i = 2 \0A\00", align 1
+@k = common global i32 0, align 4
+
+define void @t() nounwind "target-cpu"="mips16" "target-features"="+mips16,+o32" {
+entry:
+  %0 = load i32* @a, align 4
+  %cmp = icmp slt i32 %0, 10
+  %1 = load i32* @j, align 4
+  %2 = load i32* @i, align 4
+  %cond = select i1 %cmp, i32 %1, i32 %2
+  store i32 %cond, i32* @i, align 4
+  ret void
+}
+
+attributes #0 = { nounwind "target-cpu"="mips16" "target-features"="+mips16,+o32" }
+
+; 16:	slti	${{[0-9]+}}, 10
+; 16:	btnez	$BB{{[0-9]+}}_{{[0-9]}}
+
+

test/CodeGen/Mips/selgek.ll

@@ -90,3 +90,5 @@ attributes #1 = { "target-cpu"="mips16" "target-features"="+mips16,+o32" }
 
 ; 16:	slti	${{[0-9]+}}, 2 	# 16 bit inst
 ; 16:	btnez	$BB{{[0-9]+}}_{{[0-9]}}
+
+

test/CodeGen/Mips/selltk.ll

@@ -90,3 +90,4 @@ attributes #1 = { "target-cpu"="mips16" "target-features"="+mips16,+o32" }
 
 ; 16:	slti	${{[0-9]+}}, 3 	# 16 bit inst
 ; 16:	btnez	$BB{{[0-9]+}}_{{[0-9]}}
+

test/CodeGen/Mips/selne.ll

@@ -94,3 +94,4 @@ attributes #1 = { "target-cpu"="mips16" "target-features"="+mips16,+o32" }
 
 ; 16:	cmp	${{[0-9]+}}, ${{[0-9]+}}
 ; 16:	bteqz	$BB{{[0-9]+}}_{{[0-9]}}
+

test/CodeGen/Mips/selpat.ll

@@ -41,7 +41,7 @@ entry:
   %cond = select i1 %cmp, i32 %1, i32 %2
   store i32 %cond, i32* @z1, align 4
 ; 16:	cmpi	${{[0-9]+}}, 1
-; 16:	bteqz	.+4
+; 16:	bteqz	$BB{{[0-9]+}}_{{[0-9]}}
 ; 16: 	move    ${{[0-9]+}}, ${{[0-9]+}}
   %cmp1 = icmp eq i32 %0, 10
   %cond5 = select i1 %cmp1, i32 %2, i32 %1
@@ -51,7 +51,7 @@ entry:
   %cond10 = select i1 %cmp6, i32 %2, i32 %1
   store i32 %cond10, i32* @z3, align 4
 ; 16:	cmpi	${{[0-9]+}}, 10
-; 16:	bteqz	.+4
+; 16:	bteqz	$BB{{[0-9]+}}_{{[0-9]}}
 ; 16: 	move    ${{[0-9]+}}, ${{[0-9]+}}
   %cmp11 = icmp eq i32 %3, 10
   %cond15 = select i1 %cmp11, i32 %1, i32 %2
@@ -212,7 +212,7 @@ entry:
   %cond = select i1 %cmp, i32 %1, i32 %2
   store i32 %cond, i32* @z1, align 4
 ; 16:	cmpi	${{[0-9]+}}, 1
-; 16:	btnez	.+4
+; 16:	btnez	$BB{{[0-9]+}}_{{[0-9]}}
 ; 16: 	move    ${{[0-9]+}}, ${{[0-9]+}}
   %cmp1 = icmp ne i32 %0, 10
   %cond5 = select i1 %cmp1, i32 %2, i32 %1
@@ -222,7 +222,7 @@ entry:
   %cond10 = select i1 %cmp6, i32 %2, i32 %1
   store i32 %cond10, i32* @z3, align 4
 ; 16:	cmpi	${{[0-9]+}}, 10
-; 16:	btnez	.+4
+; 16:	btnez	$BB{{[0-9]+}}_{{[0-9]}}
 ; 16: 	move    ${{[0-9]+}}, ${{[0-9]+}}
   %cmp11 = icmp ne i32 %3, 10
   %cond15 = select i1 %cmp11, i32 %1, i32 %2