8266775: Add VectorLoadConst node implementation for Arm SVE

Co-authored-by: Wang Huang <whuang@openjdk.org>
Co-authored-by: Ai Jiaming <aijiaming1@huawei.com>
Reviewed-by: xgong, njian

Author: Wang Huang

src/hotspot/cpu/aarch64/aarch64_neon.ad

@@ -3368,9 +3368,10 @@ instruct vmaskcastX(vecX dst)
 
 instruct loadcon8B(vecD dst, immI0 src)
 %{
-  predicate((n->as_Vector()->length() == 2 || n->as_Vector()->length() == 4 ||
-             n->as_Vector()->length() == 8) &&
-             n->bottom_type()->is_vect()->element_basic_type() == T_BYTE);
+  predicate(UseSVE == 0 &&
+           (n->as_Vector()->length() == 2 || n->as_Vector()->length() == 4 ||
+            n->as_Vector()->length() == 8) &&
+            n->bottom_type()->is_vect()->element_basic_type() == T_BYTE);
   match(Set dst (VectorLoadConst src));
   ins_cost(INSN_COST);
   format %{ "ldr $dst, CONSTANT_MEMORY\t# load iota indices" %}
@@ -3383,7 +3384,7 @@ instruct loadcon8B(vecD dst, immI0 src)
 
 instruct loadcon16B(vecX dst, immI0 src)
 %{
-  predicate(n->as_Vector()->length() == 16 && n->bottom_type()->is_vect()->element_basic_type() == T_BYTE);
+  predicate(UseSVE == 0 && n->as_Vector()->length() == 16 && n->bottom_type()->is_vect()->element_basic_type() == T_BYTE);
   match(Set dst (VectorLoadConst src));
   ins_cost(INSN_COST);
   format %{ "ldr $dst, CONSTANT_MEMORY\t# load iota indices" %}

src/hotspot/cpu/aarch64/aarch64_neon_ad.m4

@@ -1282,10 +1282,11 @@ dnl
 //-------------------------------- LOAD_IOTA_INDICES----------------------------------
 dnl
 define(`PREDICATE', `ifelse($1, 8,
-`predicate((n->as_Vector()->length() == 2 || n->as_Vector()->length() == 4 ||
-             n->as_Vector()->length() == 8) &&
-             n->bottom_type()->is_vect()->element_basic_type() == T_BYTE);',
-`predicate(n->as_Vector()->length() == 16 && n->bottom_type()->is_vect()->element_basic_type() == T_BYTE);')')dnl
+`predicate(UseSVE == 0 &&
+           (n->as_Vector()->length() == 2 || n->as_Vector()->length() == 4 ||
+            n->as_Vector()->length() == 8) &&
+            n->bottom_type()->is_vect()->element_basic_type() == T_BYTE);',
+`predicate(UseSVE == 0 && n->as_Vector()->length() == 16 && n->bottom_type()->is_vect()->element_basic_type() == T_BYTE);')')dnl
 dnl
 define(`VECTOR_LOAD_CON', `
 instruct loadcon$1B`'(vec$2 dst, immI0 src)

src/hotspot/cpu/aarch64/aarch64_sve.ad

@@ -225,9 +225,9 @@ source %{
         // Others
       case Op_ExtractC:
       case Op_ExtractUB:
-      // Vector API specific
-      case Op_VectorLoadConst:
         return false;
+      // Vector API specific
+      case Op_LoadVectorGather:
       case Op_StoreVectorScatter:
         // Currently the implementation for partial vectors are not implemented yet.
         // Will add them in a separate patch.
@@ -4219,3 +4219,17 @@ instruct scatterL(vmemA mem, vReg src, vReg idx) %{
   %}
   ins_pipe(pipe_slow);
 %}
+
+// ------------------------------ Vector Load Const -------------------------------
+
+instruct loadconB(vReg dst, immI0 src) %{
+  predicate(UseSVE > 0 &&
+            n->bottom_type()->is_vect()->element_basic_type() == T_BYTE);
+  match(Set dst (VectorLoadConst src));
+  ins_cost(SVE_COST);
+  format %{ "sve_index $dst, 0, 1\t# generate iota indices" %}
+  ins_encode %{
+    __ sve_index(as_FloatRegister($dst$$reg), __ B, 0, 1);
+  %}
+  ins_pipe(pipe_slow);
+%}

src/hotspot/cpu/aarch64/aarch64_sve_ad.m4

@@ -220,9 +220,9 @@ source %{
         // Others
       case Op_ExtractC:
       case Op_ExtractUB:
-      // Vector API specific
-      case Op_VectorLoadConst:
         return false;
+      // Vector API specific
+      case Op_LoadVectorGather:
       case Op_StoreVectorScatter:
         // Currently the implementation for partial vectors are not implemented yet.
         // Will add them in a separate patch.
@@ -2491,3 +2491,17 @@ instruct scatterL(vmemA mem, vReg src, vReg idx) %{
   %}
   ins_pipe(pipe_slow);
 %}
+
+// ------------------------------ Vector Load Const -------------------------------
+
+instruct loadconB(vReg dst, immI0 src) %{
+  predicate(UseSVE > 0 &&
+            n->bottom_type()->is_vect()->element_basic_type() == T_BYTE);
+  match(Set dst (VectorLoadConst src));
+  ins_cost(SVE_COST);
+  format %{ "sve_index $dst, 0, 1\t# generate iota indices" %}
+  ins_encode %{
+    __ sve_index(as_FloatRegister($dst$$reg), __ B, 0, 1);
+  %}
+  ins_pipe(pipe_slow);
+%}