[m88k] Implement G_FREEZE

Most likely this is not fully implemented yet, but it works for the most
common cases.

3 files changed, 9 insertions, 1 deletions

diff --git a/llvm/lib/Target/M88k/GISel/M88kInstructionSelector.cpp b/llvm/lib/Target/M88k/GISel/M88kInstructionSelector.cpp
index 53a5458..50a2ecd 100644
--- a/llvm/lib/Target/M88k/GISel/M88kInstructionSelector.cpp
+++ b/llvm/lib/Target/M88k/GISel/M88kInstructionSelector.cpp
@@ -193,6 +193,7 @@ static bool selectCopy(MachineInstr &I, const TargetInstrInfo &TII,
                       << " operand\n");
     return false;
   }
+  I.setDesc(TII.get(TargetOpcode::COPY));
   return true;
 }
 
@@ -1093,6 +1094,8 @@ bool M88kInstructionSelector::select(MachineInstr &I) {
     return true;
 
   switch (I.getOpcode()) {
+  case TargetOpcode::G_FREEZE:
+    return selectCopy(I, TII, MRI, TRI, RBI);
   case TargetOpcode::G_INTRINSIC:
     return selectIntrinsic(I, MBB, MRI);
   case TargetOpcode::G_GLOBAL_VALUE:
diff --git a/llvm/lib/Target/M88k/GISel/M88kLegalizerInfo.cpp b/llvm/lib/Target/M88k/GISel/M88kLegalizerInfo.cpp
index fffaa10..ea865ca 100644
--- a/llvm/lib/Target/M88k/GISel/M88kLegalizerInfo.cpp
+++ b/llvm/lib/Target/M88k/GISel/M88kLegalizerInfo.cpp
@@ -47,7 +47,9 @@ M88kLegalizerInfo::M88kLegalizerInfo(const M88kSubtarget &ST) {
   getActionDefinitionsBuilder(G_PHI).legalFor({S32, P0});
   getActionDefinitionsBuilder(G_SELECT)
       .customForCartesianProduct({S32, S64, P0}, {S1});
-  getActionDefinitionsBuilder({G_IMPLICIT_DEF, G_FREEZE}).legalFor({S32});
+  getActionDefinitionsBuilder({G_IMPLICIT_DEF, G_FREEZE})
+      .legalFor({S32, P0})
+      .clampScalar(0, S32, S32);
   getActionDefinitionsBuilder(G_MERGE_VALUES).legalFor({{S64, S32}});
   getActionDefinitionsBuilder(G_UNMERGE_VALUES).legalFor({{S32, S64}});
   getActionDefinitionsBuilder(G_CONSTANT)
diff --git a/llvm/lib/Target/M88k/GISel/M88kRegisterBankInfo.cpp b/llvm/lib/Target/M88k/GISel/M88kRegisterBankInfo.cpp
index cfa198c..60cbfe7 100644
--- a/llvm/lib/Target/M88k/GISel/M88kRegisterBankInfo.cpp
+++ b/llvm/lib/Target/M88k/GISel/M88kRegisterBankInfo.cpp
@@ -303,6 +303,9 @@ M88kRegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
                                           getValueMapping(PMI_GR64)});
     break;
   }
+  case TargetOpcode::G_FREEZE:
+    OperandsMapping = getValueMapping(PMI_GR32);
+    break;
   case TargetOpcode::COPY: {
     Register DstReg = MI.getOperand(0).getReg();
     Register SrcReg = MI.getOperand(1).getReg();