AMDGPU/SI: Fix commuting of 32-bit VOPC instructions

[• tstellarAMD]

Summary

We didn't have entries in the commuting table for the 32-bit
instructions. I don't think we hit this problem now, but we
will once uniform branching is enabled. Tests will come in
a later commit.

[arsenm]

LGTM

llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.td

class VOPC_Pseudo <dag ins, list<dag> pattern, string opName> :
   let isCodeGenOnly = 1;
 }
 
 multiclass VOPC_m <vopc op, dag ins, string op_asm, list<dag> pattern,
                    string opName, bit DefExec, VOPProfile p,
                    list<SchedReadWrite> sched,
                    string revOpName = "", string asm = opName#"_e32 "#op_asm,
                    string alias_asm = opName#" "#op_asm> {
-  def "" : VOPC_Pseudo <ins, pattern, opName> {
+  def "" : VOPC_Pseudo <ins, pattern, opName>,
+           VOP2_REV<revOpName#"_e32", !eq(revOpName, opName)> {
     let Defs = !if(DefExec, [VCC, EXEC], [VCC]);
     let SchedRW = sched;
   }
 
   let AssemblerPredicates = [isSICI] in {
     def _si : VOPC<op.SI, ins, asm, []>,
               SIMCInstr <opName#"_e32", SISubtarget.SI> {
       let Defs = !if(DefExec, [VCC, EXEC], [VCC]);
multiclass VOPC_m <vopc op, dag ins, string op_asm, list<dag> pattern,
   } // End AssemblerPredicates = [isVI]
 
   defm : SIInstAliasBuilder<alias_asm, p>;
 }
 
 multiclass VOPC_Helper <vopc op, string opName, list<dag> pat32,
                         list<dag> pat64, bit DefExec, string revOp,
                         VOPProfile p, list<SchedReadWrite> sched> {
-  defm _e32 : VOPC_m <op, p.Ins32, p.Asm32, pat32, opName, DefExec, p, sched>;
+  defm _e32 : VOPC_m <op, p.Ins32, p.Asm32, pat32, opName, DefExec, p, sched,
+                      revOp>;
 
   defm _e64 : VOP3_C_m <op, (outs VOPDstS64:$dst), p.Ins64, opName#p.Asm64, pat64,
                         opName, p.HasModifiers, DefExec, revOp, sched>;
 }
 
 // Special case for class instructions which only have modifiers on
 // the 1st source operand.
 multiclass VOPC_Class_Helper <vopc op, string opName, list<dag> pat32,