Handle alignment.

Author: TheRealMDoerr

src/hotspot/cpu/ppc/gc/shared/barrierSetAssembler_ppc.cpp

@@ -338,6 +338,7 @@ int SaveLiveRegisters::iterate_over_register_mask(IterationAction action, int of
       VectorSRegister vs_reg = vm_reg->as_VectorSRegister();
       if (vs_reg->encoding() >= VSR32->encoding() && vs_reg->encoding() <= VSR51->encoding()) {
         reg_save_index += 2;
+        align_up(reg_save_index, 2);
 
         Register spill_addr = R0;
         int spill_offset = offset - reg_save_index * BytesPerWord;

src/hotspot/cpu/ppc/ppc.ad

@@ -1818,6 +1818,7 @@ uint MachSpillCopyNode::implementation(C2_MacroAssembler *masm, PhaseRegAlloc *r
     else if (src_lo_rc == rc_vs && dst_lo_rc == rc_stack) {
       VectorSRegister Rsrc = as_VectorSRegister(Matcher::_regEncode[src_lo]);
       int dst_offset = ra_->reg2offset(dst_lo);
+      assert(is_aligned(dst_offset, StackAlignmentInBytes), "should be");
       if (PowerArchitecturePPC64 >= 9) {
         if (masm) {
           __ stxv(Rsrc, dst_offset, R1_SP);
@@ -1835,6 +1836,7 @@ uint MachSpillCopyNode::implementation(C2_MacroAssembler *masm, PhaseRegAlloc *r
     else if (src_lo_rc == rc_stack && dst_lo_rc == rc_vs) {
       VectorSRegister Rdst = as_VectorSRegister(Matcher::_regEncode[dst_lo]);
       int src_offset = ra_->reg2offset(src_lo);
+      assert(is_aligned(src_offset, StackAlignmentInBytes), "should be");
       if (PowerArchitecturePPC64 >= 9) {
         if (masm) {
           __ lxv(Rdst, src_offset, R1_SP);

src/hotspot/cpu/ppc/sharedRuntime_ppc.cpp

@@ -354,6 +354,7 @@ OopMap* RegisterSaver::push_frame_reg_args_and_save_live_registers(MacroAssemble
     offset += reg_size;
   }
 
+  assert(is_aligned(offset, StackAlignmentInBytes), "should be");
   if (PowerArchitecturePPC64 >= 10) {
     for (int i = 0; i < vsregstosave_num; i += 2) {
       int reg_num  = RegisterSaver_LiveVSRegs[i].reg_num;
@@ -444,6 +445,7 @@ void RegisterSaver::restore_live_registers_and_pop_frame(MacroAssembler* masm,
     offset += reg_size;
   }
 
+  assert(is_aligned(offset, StackAlignmentInBytes), "should be");
   if (PowerArchitecturePPC64 >= 10) {
     for (int i = 0; i < vsregstosave_num; i += 2) {
       int reg_num  = RegisterSaver_LiveVSRegs[i].reg_num;