8308091: Remove unused iRegIHeapbase() matching operand

Reviewed-by: fyang, thartmann

Author: zhengxiaolinX

src/hotspot/cpu/aarch64/aarch64.ad

@@ -664,11 +664,6 @@ reg_class method_reg(
     R12, R12_H
 );
 
-// Class for heapbase register
-reg_class heapbase_reg(
-    R27, R27_H
-);
-
 // Class for thread register
 reg_class thread_reg(
     R28, R28_H
@@ -1244,15 +1239,15 @@ source %{
     // zero, compressed klass pointers doesn't use r27 after JDK-8234794
     if (UseCompressedOops && (CompressedOops::ptrs_base() != NULL)) {
       _NO_SPECIAL_REG32_mask.Remove(OptoReg::as_OptoReg(r27->as_VMReg()));
-      _NO_SPECIAL_REG_mask.SUBTRACT(_HEAPBASE_REG_mask);
-      _NO_SPECIAL_PTR_REG_mask.SUBTRACT(_HEAPBASE_REG_mask);
+      _NO_SPECIAL_REG_mask.Remove(OptoReg::as_OptoReg(r27->as_VMReg()));
+      _NO_SPECIAL_PTR_REG_mask.Remove(OptoReg::as_OptoReg(r27->as_VMReg()));
     }
 
     // r29 is not allocatable when PreserveFramePointer is on
     if (PreserveFramePointer) {
       _NO_SPECIAL_REG32_mask.Remove(OptoReg::as_OptoReg(r29->as_VMReg()));
-      _NO_SPECIAL_REG_mask.SUBTRACT(_FP_REG_mask);
-      _NO_SPECIAL_PTR_REG_mask.SUBTRACT(_FP_REG_mask);
+      _NO_SPECIAL_REG_mask.Remove(OptoReg::as_OptoReg(r29->as_VMReg()));
+      _NO_SPECIAL_PTR_REG_mask.Remove(OptoReg::as_OptoReg(r29->as_VMReg()));
     }
   }
 
@@ -5320,17 +5315,6 @@ operand iRegNNoSp()
   interface(REG_INTER);
 %}
 
-// heap base register -- used for encoding immN0
-
-operand iRegIHeapbase()
-%{
-  constraint(ALLOC_IN_RC(heapbase_reg));
-  match(RegI);
-  op_cost(0);
-  format %{ %}
-  interface(REG_INTER);
-%}
-
 // Float Register
 // Float register operands
 operand vRegF()

src/hotspot/cpu/riscv/riscv.ad

@@ -705,11 +705,6 @@ reg_class method_reg(
     R31, R31_H
 );
 
-// Class for heapbase register
-reg_class heapbase_reg(
-    R27, R27_H
-);
-
 // Class for java thread register
 reg_class java_thread_reg(
     R23, R23_H
@@ -1077,15 +1072,15 @@ void reg_mask_init() {
   // x27 is not allocatable when compressed oops is on
   if (UseCompressedOops) {
     _NO_SPECIAL_REG32_mask.Remove(OptoReg::as_OptoReg(x27->as_VMReg()));
-    _NO_SPECIAL_REG_mask.SUBTRACT(_HEAPBASE_REG_mask);
-    _NO_SPECIAL_PTR_REG_mask.SUBTRACT(_HEAPBASE_REG_mask);
+    _NO_SPECIAL_REG_mask.Remove(OptoReg::as_OptoReg(x27->as_VMReg()));
+    _NO_SPECIAL_PTR_REG_mask.Remove(OptoReg::as_OptoReg(x27->as_VMReg()));
   }
 
   // x8 is not allocatable when PreserveFramePointer is on
   if (PreserveFramePointer) {
     _NO_SPECIAL_REG32_mask.Remove(OptoReg::as_OptoReg(x8->as_VMReg()));
-    _NO_SPECIAL_REG_mask.SUBTRACT(_FP_REG_mask);
-    _NO_SPECIAL_PTR_REG_mask.SUBTRACT(_FP_REG_mask);
+    _NO_SPECIAL_REG_mask.Remove(OptoReg::as_OptoReg(x8->as_VMReg()));
+    _NO_SPECIAL_PTR_REG_mask.Remove(OptoReg::as_OptoReg(x8->as_VMReg()));
   }
 }
 
@@ -3507,16 +3502,6 @@ operand iRegNNoSp()
   interface(REG_INTER);
 %}
 
-// heap base register -- used for encoding immN0
-operand iRegIHeapbase()
-%{
-  constraint(ALLOC_IN_RC(heapbase_reg));
-  match(RegI);
-  op_cost(0);
-  format %{ %}
-  interface(REG_INTER);
-%}
-
 // Long 64 bit Register R10 only
 operand iRegL_R10()
 %{