[RISCV] Don't iterate SEW set again for floating-point

[• pcwang-thead]

Summary

We have already iterated over FPList, so there is no need to get
and loop over SEW set again. Or we will generate some useless pseudo
instructions like PseudoXXX_VF16_M1_E64.

We add SEW to FPR_Info so that we can get it later. And we rewrite
FPR_Info to reduce arguments incidentally.

This should reduce the size of files generated by TableGen.

[craig.topper]

LGTM

llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td

 
 class MxSet<int eew> {
   list<LMULInfo> m = !cond(!eq(eew, 8) : [V_MF8, V_MF4, V_MF2, V_M1, V_M2, V_M4, V_M8],
                            !eq(eew, 16) : [V_MF4, V_MF2, V_M1, V_M2, V_M4, V_M8],
                            !eq(eew, 32) : [V_MF2, V_M1, V_M2, V_M4, V_M8],
                            !eq(eew, 64) : [V_M1, V_M2, V_M4, V_M8]);
 }
 
-class FPR_Info<RegisterClass regclass, string fx, list<LMULInfo> mxlist,
-               list<LMULInfo> mxlistfw> {
-  RegisterClass fprclass = regclass;
-  string FX = fx;
-  list<LMULInfo> MxList = mxlist;
-  list<LMULInfo> MxListFW = mxlistfw;
+class FPR_Info<int sew> {
+  RegisterClass fprclass = !cast<RegisterClass>("FPR" # sew);
+  string FX = "F" # sew;
+  int SEW = sew;
+  list<LMULInfo> MxList = MxSet<sew>.m;
+  list<LMULInfo> MxListFW = !if(!eq(sew, 64), [], !listremove(MxList, [V_M8]));
 }
 
-def SCALAR_F16 : FPR_Info<FPR16, "F16", MxSet<16>.m, [V_MF4, V_MF2, V_M1, V_M2, V_M4]>;
-def SCALAR_F32 : FPR_Info<FPR32, "F32", MxSet<32>.m, [V_MF2, V_M1, V_M2, V_M4]>;
-def SCALAR_F64 : FPR_Info<FPR64, "F64", MxSet<64>.m, []>;
+def SCALAR_F16 : FPR_Info<16>;
+def SCALAR_F32 : FPR_Info<32>;
+def SCALAR_F64 : FPR_Info<64>;
 
 defvar FPList = [SCALAR_F16, SCALAR_F32, SCALAR_F64];
 
 // Used for widening instructions. It excludes F64.
 defvar FPListW = [SCALAR_F16, SCALAR_F32];
 
 class NFSet<LMULInfo m> {
   list<int> L = !cond(!eq(m.value, V_M8.value): [],
foreach e = sews in {
       defm "" : VPseudoBinaryFV_VV<m, "", e>,
                 Sched<[WriteVFDivV_MX_E, ReadVFDivV_MX_E, ReadVFDivV_MX_E, ReadVMask]>;
     }
   }
 
   foreach f = FPList in {
     foreach m = f.MxList in {
       defvar mx = m.MX;
-      defvar sews = SchedSEWSet<mx, /*isF*/ 1>.val;
-      foreach e = sews in {
-        defvar WriteVFDivF_MX_E = !cast<SchedWrite>("WriteVFDivF_" # mx # "_E" # e);
-        defvar ReadVFDivV_MX_E = !cast<SchedRead>("ReadVFDivV_" # mx # "_E" # e);
-        defvar ReadVFDivF_MX_E = !cast<SchedRead>("ReadVFDivF_" # mx # "_E" # e);
+      defvar WriteVFDivF_MX_E = !cast<SchedWrite>("WriteVFDivF_" # mx # "_E" # f.SEW);
+      defvar ReadVFDivV_MX_E = !cast<SchedRead>("ReadVFDivV_" # mx # "_E" # f.SEW);
+      defvar ReadVFDivF_MX_E = !cast<SchedRead>("ReadVFDivF_" # mx # "_E" # f.SEW);
 
-        defm "" : VPseudoBinaryV_VF<m, f, "", e>,
-                  Sched<[WriteVFDivF_MX_E, ReadVFDivV_MX_E, ReadVFDivF_MX_E, ReadVMask]>;
-      }
-    }
-  }
-}
+      defm "" : VPseudoBinaryV_VF<m, f, "", f.SEW>,
 
 multiclass VPseudoVFRDIV_VF {
   foreach f = FPList in {
     foreach m = f.MxList in {
       defvar mx = m.MX;
-      defvar sews = SchedSEWSet<mx, /*isF*/ 1>.val;
-      foreach e = sews in {
-        defvar WriteVFDivF_MX_E = !cast<SchedWrite>("WriteVFDivF_" # mx # "_E" # e);
-        defvar ReadVFDivV_MX_E = !cast<SchedRead>("ReadVFDivV_" # mx # "_E" # e);
-        defvar ReadVFDivF_MX_E = !cast<SchedRead>("ReadVFDivF_" # mx # "_E" # e);
+      defvar WriteVFDivF_MX_E = !cast<SchedWrite>("WriteVFDivF_" # mx # "_E" # f.SEW);
+      defvar ReadVFDivV_MX_E = !cast<SchedRead>("ReadVFDivV_" # mx # "_E" # f.SEW);
+      defvar ReadVFDivF_MX_E = !cast<SchedRead>("ReadVFDivF_" # mx # "_E" # f.SEW);
 
-        defm "" : VPseudoBinaryV_VF<m, f, "", e>,
-                  Sched<[WriteVFDivF_MX_E, ReadVFDivV_MX_E, ReadVFDivF_MX_E, ReadVMask]>;
-      }
-    }
-  }
-}
+      defm "" : VPseudoBinaryV_VF<m, f, "", f.SEW>,
 
 multiclass VPseudoVALU_VV_VX {
  foreach m = MxList in {
     defvar mx = m.MX;
     defvar WriteVIALUV_MX = !cast<SchedWrite>("WriteVIALUV_" # mx);
     defvar WriteVIALUX_MX = !cast<SchedWrite>("WriteVIALUV_" # mx);
     defvar ReadVIALUV_MX = !cast<SchedRead>("ReadVIALUV_" # mx);
     defvar ReadVIALUX_MX = !cast<SchedRead>("ReadVIALUX_" # mx);