PowerPC: Use CCBITRC operand for ISEL patterns.

This commit changes the ISEL patterns to use a CCBITRC operand
instead of a "pred" operand.  This matches the actual instruction
text more directly, and simplifies use of ISEL with the asm parser.
In addition, this change allows some simplification of handling
the "pred" operand, as this is now only used by BCC.

No change in generated code.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178003 91177308-0d34-0410-b5e6-96231b3b80d8

5 files changed, 19 insertions, 46 deletions

diff --git a/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp b/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
index 985c343..1949f21 100644
--- a/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
+++ b/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
@@ -87,31 +87,6 @@ void PPCInstPrinter::printPredicateOperand(const MCInst *MI, unsigned OpNo,
                                            raw_ostream &O, 
                                            const char *Modifier) {
   unsigned Code = MI->getOperand(OpNo).getImm();
-  if (!Modifier) {
-    unsigned CCReg = MI->getOperand(OpNo+1).getReg();
-    unsigned RegNo;
-    switch (CCReg) {
-    default: llvm_unreachable("Unknown CR register");
-    case PPC::CR0: RegNo = 0; break;
-    case PPC::CR1: RegNo = 1; break;
-    case PPC::CR2: RegNo = 2; break;
-    case PPC::CR3: RegNo = 3; break;
-    case PPC::CR4: RegNo = 4; break;
-    case PPC::CR5: RegNo = 5; break;
-    case PPC::CR6: RegNo = 6; break;
-    case PPC::CR7: RegNo = 7; break;
-    }
-
-    // Print the CR bit number. The Code is ((BI << 5) | BO) for a
-    // BCC, but we must have the positive form here (BO == 12)
-    unsigned BI = Code >> 5;
-    assert((Code & 0xF) == 12 &&
-           "BO in predicate bit must have the positive form");
-
-    unsigned Value = 4*RegNo + BI;
-    O << Value;
-    return;
-  }
 
   if (StringRef(Modifier) == "cc") {
     switch ((PPC::Predicate)Code) {
diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index 680a780..6631e4a 100644
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -6170,24 +6170,24 @@ PPCTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
     unsigned SelectPred = MI->getOperand(4).getImm();
     DebugLoc dl = MI->getDebugLoc();
 
-    // The SelectPred is ((BI << 5) | BO) for a BCC
-    unsigned BO = SelectPred & 0xF;
-    assert((BO == 12 || BO == 4) && "invalid predicate BO field for isel");
-
-    unsigned TrueOpNo, FalseOpNo;
-    if (BO == 12) {
-      TrueOpNo = 2;
-      FalseOpNo = 3;
-    } else {
-      TrueOpNo = 3;
-      FalseOpNo = 2;
-      SelectPred = PPC::InvertPredicate((PPC::Predicate)SelectPred);
+    unsigned SubIdx;
+    bool SwapOps;
+    switch (SelectPred) {
+    default: llvm_unreachable("invalid predicate for isel");
+    case PPC::PRED_EQ: SubIdx = PPC::sub_eq; SwapOps = false; break;
+    case PPC::PRED_NE: SubIdx = PPC::sub_eq; SwapOps = true; break;
+    case PPC::PRED_LT: SubIdx = PPC::sub_lt; SwapOps = false; break;
+    case PPC::PRED_GE: SubIdx = PPC::sub_lt; SwapOps = true; break;
+    case PPC::PRED_GT: SubIdx = PPC::sub_gt; SwapOps = false; break;
+    case PPC::PRED_LE: SubIdx = PPC::sub_gt; SwapOps = true; break;
+    case PPC::PRED_UN: SubIdx = PPC::sub_un; SwapOps = false; break;
+    case PPC::PRED_NU: SubIdx = PPC::sub_un; SwapOps = true; break;
     }
 
     BuildMI(*BB, MI, dl, TII->get(OpCode), MI->getOperand(0).getReg())
-      .addReg(MI->getOperand(TrueOpNo).getReg())
-      .addReg(MI->getOperand(FalseOpNo).getReg())
-      .addImm(SelectPred).addReg(MI->getOperand(1).getReg());
+      .addReg(MI->getOperand(SwapOps? 3 : 2).getReg())
+      .addReg(MI->getOperand(SwapOps? 2 : 3).getReg())
+      .addReg(MI->getOperand(1).getReg(), 0, SubIdx);
   } else if (MI->getOpcode() == PPC::SELECT_CC_I4 ||
              MI->getOpcode() == PPC::SELECT_CC_I8 ||
              MI->getOpcode() == PPC::SELECT_CC_F4 ||
diff --git a/lib/Target/PowerPC/PPCInstr64Bit.td b/lib/Target/PowerPC/PPCInstr64Bit.td
index 899ed0d..ce4f825 100644
--- a/lib/Target/PowerPC/PPCInstr64Bit.td
+++ b/lib/Target/PowerPC/PPCInstr64Bit.td
@@ -514,7 +514,7 @@ def RLWINM8 : MForm_2<21,
                      []>;
 
 def ISEL8   : AForm_4<31, 15,
-                     (outs G8RC:$rT), (ins G8RC_NOX0:$rA, G8RC:$rB, pred:$cond),
+                     (outs G8RC:$rT), (ins G8RC_NOX0:$rA, G8RC:$rB, CRBITRC:$cond),
                      "isel $rT, $rA, $rB, $cond", IntGeneral,
                      []>;
 }  // End FXU Operations.
diff --git a/lib/Target/PowerPC/PPCInstrFormats.td b/lib/Target/PowerPC/PPCInstrFormats.td
index 16dbee5..c4fd192 100644
--- a/lib/Target/PowerPC/PPCInstrFormats.td
+++ b/lib/Target/PowerPC/PPCInstrFormats.td
@@ -777,16 +777,14 @@ class AForm_4<bits<6> opcode, bits<5> xo, dag OOL, dag IOL, string asmstr,
   bits<5> RT;
   bits<5> RA;
   bits<5> RB;
-  bits<7> BIBO;  // 2 bits of BI and 5 bits of BO (must be 12).
-  bits<3> CR;
+  bits<5> COND;
 
   let Pattern = pattern;
 
   let Inst{6-10}  = RT;
   let Inst{11-15} = RA;
   let Inst{16-20} = RB;
-  let Inst{21-23} = CR;
-  let Inst{24-25} = BIBO{6-5};
+  let Inst{21-25} = COND;
   let Inst{26-30} = xo;
   let Inst{31}    = 0;
 }
diff --git a/lib/Target/PowerPC/PPCInstrInfo.td b/lib/Target/PowerPC/PPCInstrInfo.td
index 3800e46..be9cfe8 100644
--- a/lib/Target/PowerPC/PPCInstrInfo.td
+++ b/lib/Target/PowerPC/PPCInstrInfo.td
@@ -1482,7 +1482,7 @@ let Uses = [RM] in {
 
 let PPC970_Unit = 1 in {  // FXU Operations.
   def ISEL  : AForm_4<31, 15,
-                     (outs GPRC:$rT), (ins GPRC_NOR0:$rA, GPRC:$rB, pred:$cond),
+                     (outs GPRC:$rT), (ins GPRC_NOR0:$rA, GPRC:$rB, CRBITRC:$cond),
                      "isel $rT, $rA, $rB, $cond", IntGeneral,
                      []>;
 }