Cover most RVC instructions by using CompressibleRegion to cover minimal functions in C2

Author: zhengxiaolinX

src/hotspot/cpu/riscv/macroAssembler_riscv.cpp

@@ -962,6 +962,7 @@ int MacroAssembler::bitset_to_regs(unsigned int bitset, unsigned char* regs) {
 // Return the number of words pushed
 int MacroAssembler::push_reg(unsigned int bitset, Register stack) {
   DEBUG_ONLY(int words_pushed = 0;)
+  CompressibleRegion cr(this);
 
   unsigned char regs[32];
   int count = bitset_to_regs(bitset, regs);
@@ -983,6 +984,7 @@ int MacroAssembler::push_reg(unsigned int bitset, Register stack) {
 
 int MacroAssembler::pop_reg(unsigned int bitset, Register stack) {
   DEBUG_ONLY(int words_popped = 0;)
+  CompressibleRegion cr(this);
 
   unsigned char regs[32];
   int count = bitset_to_regs(bitset, regs);
@@ -1005,6 +1007,7 @@ int MacroAssembler::pop_reg(unsigned int bitset, Register stack) {
 // Push float registers in the bitset, except sp.
 // Return the number of heapwords pushed.
 int MacroAssembler::push_fp(unsigned int bitset, Register stack) {
+  CompressibleRegion cr(this);
   int words_pushed = 0;
   unsigned char regs[32];
   int count = bitset_to_regs(bitset, regs);
@@ -1024,6 +1027,7 @@ int MacroAssembler::push_fp(unsigned int bitset, Register stack) {
 }
 
 int MacroAssembler::pop_fp(unsigned int bitset, Register stack) {
+  CompressibleRegion cr(this);
   int words_popped = 0;
   unsigned char regs[32];
   int count = bitset_to_regs(bitset, regs);
@@ -1044,6 +1048,7 @@ int MacroAssembler::pop_fp(unsigned int bitset, Register stack) {
 
 #ifdef COMPILER2
 int MacroAssembler::push_vp(unsigned int bitset, Register stack) {
+  CompressibleRegion cr(this);
   int vector_size_in_bytes = Matcher::scalable_vector_reg_size(T_BYTE);
 
   // Scan bitset to accumulate register pairs
@@ -1065,6 +1070,7 @@ int MacroAssembler::push_vp(unsigned int bitset, Register stack) {
 }
 
 int MacroAssembler::pop_vp(unsigned int bitset, Register stack) {
+  CompressibleRegion cr(this);
   int vector_size_in_bytes = Matcher::scalable_vector_reg_size(T_BYTE);
 
   // Scan bitset to accumulate register pairs
@@ -1087,6 +1093,7 @@ int MacroAssembler::pop_vp(unsigned int bitset, Register stack) {
 #endif // COMPILER2
 
 void MacroAssembler::push_call_clobbered_registers_except(RegSet exclude) {
+  CompressibleRegion cr(this);
   // Push integer registers x7, x10-x17, x28-x31.
   push_reg(RegSet::of(x7) + RegSet::range(x10, x17) + RegSet::range(x28, x31) - exclude, sp);
 
@@ -1101,6 +1108,7 @@ void MacroAssembler::push_call_clobbered_registers_except(RegSet exclude) {
 }
 
 void MacroAssembler::pop_call_clobbered_registers_except(RegSet exclude) {
+  CompressibleRegion cr(this);
   int offset = 0;
   for (int i = 0; i < 32; i++) {
     if (i <= f7->encoding() || i >= f28->encoding() || (i >= f10->encoding() && i <= f17->encoding())) {
@@ -1114,15 +1122,18 @@ void MacroAssembler::pop_call_clobbered_registers_except(RegSet exclude) {
 
 // Push all the integer registers, except zr(x0) & sp(x2) & gp(x3) & tp(x4).
 void MacroAssembler::pusha() {
+  CompressibleRegion cr(this);
   push_reg(0xffffffe2, sp);
 }
 
 // Pop all the integer registers, except zr(x0) & sp(x2) & gp(x3) & tp(x4).
 void MacroAssembler::popa() {
+  CompressibleRegion cr(this);
   pop_reg(0xffffffe2, sp);
 }
 
 void MacroAssembler::push_CPU_state(bool save_vectors, int vector_size_in_bytes) {
+  CompressibleRegion cr(this);
   // integer registers, except zr(x0) & ra(x1) & sp(x2) & gp(x3) & tp(x4)
   push_reg(0xffffffe0, sp);
 
@@ -1144,6 +1155,7 @@ void MacroAssembler::push_CPU_state(bool save_vectors, int vector_size_in_bytes)
 }
 
 void MacroAssembler::pop_CPU_state(bool restore_vectors, int vector_size_in_bytes) {
+  CompressibleRegion cr(this);
   // vector registers
   if (restore_vectors) {
     vsetvli(t0, x0, Assembler::e64, Assembler::m8);