[Hexagon] Use integer instructions for floating point immediates

Floating point instructions use general purpose registers, so the few
instructions that can put floating point immediates into registers are,
in fact, integer instruction. Use them explicitly instead of having
pseudo-instructions specifically for dealing with floating point values.

Simplify the constant loading instructions (from sdata) to have only two:
one for 32-bit values and one for 64-bit values: CONST32 and CONST64.

llvm-svn: 278244

1 files changed, 7 insertions, 9 deletions

diff --git a/llvm/lib/Target/Hexagon/HexagonConstPropagation.cpp b/llvm/lib/Target/Hexagon/HexagonConstPropagation.cpp
index 172df0c8271..c4a0a62e043 100644
--- a/llvm/lib/Target/Hexagon/HexagonConstPropagation.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonConstPropagation.cpp
@@ -1971,14 +1971,13 @@ bool HexagonConstEvaluator::evaluate(const MachineInstr &MI,
     default:
       return false;
     case Hexagon::A2_tfrsi:
-    case Hexagon::CONST32:
     case Hexagon::A2_tfrpi:
-    case Hexagon::CONST32_Int_Real:
-    case Hexagon::CONST64_Int_Real:
+    case Hexagon::CONST32:
+    case Hexagon::CONST64:
     {
       const MachineOperand &VO = MI.getOperand(1);
-      // The operand of CONST32_Int_Real can be a blockaddress, e.g.
-      //   %vreg0<def> = CONST32_Int_Real <blockaddress(@eat, %L)>
+      // The operand of CONST32 can be a blockaddress, e.g.
+      //   %vreg0<def> = CONST32 <blockaddress(@eat, %L)>
       // Do this check for all instructions for safety.
       if (!VO.isImm())
         return false;
@@ -2326,10 +2325,9 @@ bool HexagonConstEvaluator::rewrite(MachineInstr &MI, const CellMap &Inputs) {
     default:
       break;
     case Hexagon::A2_tfrsi:
-    case Hexagon::CONST32:
     case Hexagon::A2_tfrpi:
-    case Hexagon::CONST32_Int_Real:
-    case Hexagon::CONST64_Int_Real:
+    case Hexagon::CONST32:
+    case Hexagon::CONST64:
     case Hexagon::TFR_PdTrue:
     case Hexagon::TFR_PdFalse:
       return false;
@@ -2921,7 +2919,7 @@ bool HexagonConstEvaluator::rewriteHexConstDefs(MachineInstr &MI,
                       .addImm(Hi)
                       .addImm(Lo);
           } else {
-            NewD = &HII.get(Hexagon::CONST64_Int_Real);
+            NewD = &HII.get(Hexagon::CONST64);
             NewMI = BuildMI(B, At, DL, *NewD, NewR)
                       .addImm(V);
           }