[llvm] [X86][MC] Support Enc/Dec for EGPR for promoted AMX-TILE instruction (PR #76210)

[Phoebe Wang via llvm-commits]

================
@@ -14,35 +14,46 @@
 //===----------------------------------------------------------------------===//
 // AMX instructions
 
-let Predicates = [HasAMXTILE, In64BitMode] in {
-  let SchedRW = [WriteSystem] in {
-    let hasSideEffects = 1,
-        Defs = [TMM0,TMM1,TMM2,TMM3,TMM4,TMM5,TMM6,TMM7] in
-    def LDTILECFG : I <0x49, MRM0m, (outs), (ins opaquemem:$src),
-                       "ldtilecfg\t$src",
-                       [(int_x86_ldtilecfg addr:$src)]>, VEX, T8, PS;
-    let hasSideEffects = 1 in
-    def STTILECFG : I <0x49, MRM0m, (outs), (ins opaquemem:$src),
-                       "sttilecfg\t$src",
-                       [(int_x86_sttilecfg addr:$src)]>, VEX, T8, PD;
-    let mayLoad = 1 in
-    def TILELOADD : I<0x4b, MRMSrcMemFSIB, (outs TILE:$dst),
-                      (ins sibmem:$src),
-                      "tileloadd\t{$src, $dst|$dst, $src}", []>,
-                      VEX, T8, XD;
-    let mayLoad = 1 in
-    def TILELOADDT1 : I<0x4b, MRMSrcMemFSIB, (outs TILE:$dst),
-                        (ins sibmem:$src),
-                        "tileloaddt1\t{$src, $dst|$dst, $src}", []>,
-                        VEX, T8, PD;
+multiclass AMX_TILE_COMMON<string Suffix, Predicate HasEGPR> {
+let Predicates = [HasAMXTILE, HasEGPR, In64BitMode],
+    OpEnc = !if(!eq(Suffix, ""), EncVEX, EncEVEX), CD8_Scale = 0 in {
+  let hasSideEffects = 1,
+      Defs = [TMM0,TMM1,TMM2,TMM3,TMM4,TMM5,TMM6,TMM7] in
+  def LDTILECFG#Suffix : I<0x49, MRM0m, (outs), (ins opaquemem:$src),
+                           "ldtilecfg\t$src",
+                           [(int_x86_ldtilecfg addr:$src)]>,
+                         T8, PS;
+  let hasSideEffects = 1 in
+  def STTILECFG#Suffix : I<0x49, MRM0m, (outs), (ins opaquemem:$src),
+                           "sttilecfg\t$src",
+                           [(int_x86_sttilecfg addr:$src)]>,
+                         T8, PD;
+  let mayLoad = 1 in
+  def TILELOADD#Suffix : I<0x4b, MRMSrcMemFSIB, (outs TILE:$dst),
+                           (ins sibmem:$src),
+                           "tileloadd\t{$src, $dst|$dst, $src}", []>,
+                         T8, XD;
+  let mayLoad = 1 in
+  def TILELOADDT1#Suffix : I<0x4b, MRMSrcMemFSIB, (outs TILE:$dst),
+                             (ins sibmem:$src),
+                             "tileloaddt1\t{$src, $dst|$dst, $src}", []>,
+                           T8, PD;
+  let mayStore = 1 in
+  def TILESTORED#Suffix : I<0x4b, MRMDestMemFSIB, (outs),
+                            (ins sibmem:$dst, TILE:$src),
+                            "tilestored\t{$src, $dst|$dst, $src}", []>,
+                          T8, XS;
+}
+}
+
+let SchedRW = [WriteSystem] in {
+  defm "" : AMX_TILE_COMMON<"", NoEGPR>;
+  defm "" : AMX_TILE_COMMON<"_EVEX", HasEGPR>;
----------------
phoebewang wrote:

I think put Enc info here is a bit clear than check with if condition, e.g.,
```
  defm "" : AMX_TILE_COMMON<"", NoEGPR>, VEX;
  defm "" : AMX_TILE_COMMON<"_EVEX", HasEGPR>, EVEX, NoCD8;
```

Anyway, just a nitpick. You decide it.

https://github.com/llvm/llvm-project/pull/76210