[WebAssembly][NFC] Standardize SIMD multiclass format

[tlively]

Summary

This CL changes the ExtractLane ISEL multiclass to more closely mirror
the structure of the splat and replace_lane multiclasses.

[tlively]

This is a nonfunctional change except that it changes the names of the records for the extract_lane instructions.

lib/Target/WebAssembly/WebAssemblyInstrSIMD.td

 //===----------------------------------------------------------------------===//
 
 // immediate argument types
 def ImmByte : ImmLeaf<i32, [{ return 0 <= Imm && Imm < 256; }]>;
 foreach SIZE = [2, 4, 8, 16, 32] in
 def LaneIdx#SIZE : ImmLeaf<i32, "return 0 <= Imm && Imm < "#SIZE#";">;
 
 // lane extraction
-multiclass ExtractLane<ValueType vec_t, ImmLeaf imm_t,
-                       WebAssemblyRegClass reg_t, string name, bits<32> simdop,
-                       SDNode extract = vector_extract> {
-  defm "" : SIMD_I<(outs reg_t:$dst), (ins V128:$vec, I32:$idx),
-                   (outs), (ins I32:$idx),
-                   [(set reg_t:$dst,
-                     (extract (vec_t V128:$vec), (i32 imm_t:$idx)))],
-                   name#"\t$dst, $vec, $idx", name#"\t$idx", simdop>;
+multiclass ExtractLane<ValueType vec_t, string vec, ImmLeaf imm_t,
+                       WebAssemblyRegClass reg_t, bits<32> simdop,
+                       string suffix = "", SDNode extract = vector_extract> {
+  defm EXTRACT_LANE_#vec_t#suffix :
+      SIMD_I<(outs reg_t:$dst), (ins V128:$vec, I32:$idx),
+             [(set reg_t:$dst, (extract (vec_t V128:$vec), (i32 imm_t:$idx)))],
+             vec#".extract_lane"#suffix#"\t$dst, $vec, $idx",
+             vec#".extract_lane"#suffix#"\t$idx", simdop>;
 }
 multiclass ExtractPat<ValueType lane_t, int mask> {
   def _s : PatFrag<(ops node:$vec, node:$idx),
                    (i32 (sext_inreg
                      (i32 (vector_extract
                        node:$vec,
                        node:$idx
                      )),
                      lane_t
                    ))>;
   def _u : PatFrag<(ops node:$vec, node:$idx),
                    (i32 (and
                      (i32 (vector_extract
                        node:$vec,
                        node:$idx
                      )),
                      (i32 mask)
                    ))>;
 }
 defm extract_i8x16 : ExtractPat<i8, 0xff>;
 defm extract_i16x8 : ExtractPat<i16, 0xffff>;
 multiclass ExtractLaneExtended<string sign, bits<32> baseInst> {
-  defm _I8x16 : ExtractLane<v16i8, LaneIdx16, I32, "i8x16.extract_lane"#sign,
-                            baseInst, !cast<PatFrag>("extract_i8x16"#sign)>;
-  defm _I16x8 : ExtractLane<v8i16, LaneIdx8, I32, "i16x8.extract_lane"#sign,
-                            !add(baseInst, 2),
-                            !cast<PatFrag>("extract_i16x8"#sign)>;
+  defm "" : ExtractLane<v16i8, "i8x16", LaneIdx16, I32,  baseInst, sign,
+                        !cast<PatFrag>("extract_i8x16"#sign)>;
+  defm "" : ExtractLane<v8i16, "i16x8", LaneIdx8, I32, !add(baseInst, 2), sign,
 }
 let Defs = [ARGUMENTS] in {
-defm EXTRACT_LANE_S : ExtractLaneExtended<"_s", 9>;
-defm EXTRACT_LANE_U : ExtractLaneExtended<"_u", 10>;
-defm EXTRACT_LANE_I32x4 :
-    ExtractLane<v4i32, LaneIdx4, I32, "i32x4.extract_lane", 13>;
-defm EXTRACT_LANE_I64x2 :
-    ExtractLane<v2i64, LaneIdx2, I64, "i64x2.extract_lane", 14>;
-defm EXTRACT_LANE_F32x4 :
-    ExtractLane<v4f32, LaneIdx4, F32, "f32x4.extract_lane", 15>;
-defm EXTRACT_LANE_F64x2 :
-    ExtractLane<v2f64, LaneIdx2, F64, "f64x2.extract_lane", 16>;
+defm "" : ExtractLaneExtended<"_s", 9>;
+defm "" : ExtractLaneExtended<"_u", 10>;
+defm "" : ExtractLane<v4i32, "i32x4", LaneIdx4, I32, 13>;
+defm "" : ExtractLane<v2i64, "i64x2", LaneIdx2, I64, 14>;
+defm "" : ExtractLane<v4f32, "f32x4", LaneIdx4, F32, 15>;
+defm "" : ExtractLane<v2f64, "f64x2", LaneIdx2, F64, 16>;
 } // Defs = [ARGUMENTS]
 
 // follow convention of making implicit expansions unsigned
 def : Pat<(i32 (vector_extract (v16i8 V128:$vec), (i32 LaneIdx16:$idx))),
-          (EXTRACT_LANE_U_I8x16 V128:$vec, (i32 LaneIdx16:$idx))>;
+          (EXTRACT_LANE_v16i8_u V128:$vec, (i32 LaneIdx16:$idx))>;
 def : Pat<(i32 (vector_extract (v8i16 V128:$vec), (i32 LaneIdx8:$idx))),
-          (EXTRACT_LANE_U_I16x8 V128:$vec, (i32 LaneIdx8:$idx))>;
+          (EXTRACT_LANE_v8i16_u V128:$vec, (i32 LaneIdx8:$idx))>;
 
 // lane replacement
 multiclass ReplaceLane<ValueType vec_t, string vec, WebAssemblyRegClass reg_t,
                        ValueType lane_t, ImmLeaf imm_t, bits<32> simdop> {
-  defm REPLACE_LANE_#vec_t : SIMD_I<(outs V128:$dst),
-                                    (ins V128:$vec, I32:$idx, reg_t:$x),
-                                    (outs), (ins I32:$idx),
-                                    [(set V128:$dst, (vector_insert
-                                      (vec_t V128:$vec),
-                                      (lane_t reg_t:$x),
-                                      (i32 imm_t:$idx)))],
-                                    vec#".replace_lane\t$dst, $vec, $idx, $x",
-                                    vec#".replace_lane\t$idx", simdop>;
+  defm REPLACE_LANE_#vec_t :
+      SIMD_I<(outs V128:$dst), (ins V128:$vec, I32:$idx, reg_t:$x),
+               (vec_t V128:$vec), (lane_t reg_t:$x), (i32 imm_t:$idx)))],
 }
 let Defs = [ARGUMENTS] in {
 defm "" : ReplaceLane<v16i8, "i8x16", I32, i32, LaneIdx16, 17>;
 defm "" : ReplaceLane<v8i16, "i16x8", I32, i32, LaneIdx8, 18>;
 defm "" : ReplaceLane<v4i32, "i32x4", I32, i32, LaneIdx4, 19>;
 defm "" : ReplaceLane<v2i64, "i64x2", I64, i64, LaneIdx2, 20>;
 defm "" : ReplaceLane<v4f32, "f32x4", F32, f32, LaneIdx4, 21>;
 defm "" : ReplaceLane<v2f64, "f64x2", F64, f64, LaneIdx2, 22>;
 } // Defs = [ARGUMENTS]
 
 // splats
 def splat2 : PatFrag<(ops node:$x), (build_vector node:$x, node:$x)>;
 def splat4 : PatFrag<(ops node:$x), (build_vector
                        node:$x, node:$x, node:$x, node:$x)>;
 def splat8 : PatFrag<(ops node:$x), (build_vector
                        node:$x, node:$x, node:$x, node:$x,
                        node:$x, node:$x, node:$x, node:$x)>;
 def splat16 : PatFrag<(ops node:$x), (build_vector
                         node:$x, node:$x, node:$x, node:$x,
                         node:$x, node:$x, node:$x, node:$x,
                         node:$x, node:$x, node:$x, node:$x,
                         node:$x, node:$x, node:$x, node:$x)>;
-multiclass Splat<ValueType vec_t, string name, WebAssemblyRegClass reg_t,
+multiclass Splat<ValueType vec_t, string vec, WebAssemblyRegClass reg_t,
                  PatFrag splat_pat, bits<32> simdop> {
   defm SPLAT_#vec_t : SIMD_I<(outs V128:$dst), (ins reg_t:$x), (outs), (ins),
                              [(set (vec_t V128:$dst), (splat_pat reg_t:$x))],
-                             name#".splat\t$dst, $x", name#".splat", simdop>;
+                             vec#".splat\t$dst, $x", vec#".splat", simdop>;
 }
 let Defs = [ARGUMENTS] in {
 defm "" : Splat<v16i8, "i8x16", I32, splat16, 3>;
 defm "" : Splat<v8i16, "i16x8", I32, splat8, 4>;
 defm "" : Splat<v4i32, "i32x4", I32, splat4, 5>;
 defm "" : Splat<v2i64, "i64x2", I64, splat2, 6>;
 defm "" : Splat<v4f32, "f32x4", F32, splat4, 7>;
 defm "" : Splat<v2f64, "f64x2", F64, splat2, 8>;