src/hotspot/cpu/aarch64/c2_MacroAssembler_aarch64.cpp

8248238: Adding Windows support to OpenJDK on AArch64

Summary: Adding Windows support for AArch64

Contributed-by: Ludovic Henry <luhenry@microsoft.com>, Monica Beckwith <monica.beckwith@microsoft.com>
Reviewed-by:

*** 541,551 ****
  // Compare strings.
  void C2_MacroAssembler::string_compare(Register str1, Register str2,
      Register cnt1, Register cnt2, Register result, Register tmp1, Register tmp2,
      FloatRegister vtmp1, FloatRegister vtmp2, FloatRegister vtmp3, int ae) {
    Label DONE, SHORT_LOOP, SHORT_STRING, SHORT_LAST, TAIL, STUB,
!       DIFFERENCE, NEXT_WORD, SHORT_LOOP_TAIL, SHORT_LAST2, SHORT_LAST_INIT,
        SHORT_LOOP_START, TAIL_CHECK;
  
    bool isLL = ae == StrIntrinsicNode::LL;
    bool isLU = ae == StrIntrinsicNode::LU;
    bool isUL = ae == StrIntrinsicNode::UL;
--- 541,551 ----
  // Compare strings.
  void C2_MacroAssembler::string_compare(Register str1, Register str2,
      Register cnt1, Register cnt2, Register result, Register tmp1, Register tmp2,
      FloatRegister vtmp1, FloatRegister vtmp2, FloatRegister vtmp3, int ae) {
    Label DONE, SHORT_LOOP, SHORT_STRING, SHORT_LAST, TAIL, STUB,
!       DIFF, NEXT_WORD, SHORT_LOOP_TAIL, SHORT_LAST2, SHORT_LAST_INIT,
        SHORT_LOOP_START, TAIL_CHECK;
  
    bool isLL = ae == StrIntrinsicNode::LL;
    bool isLU = ae == StrIntrinsicNode::LU;
    bool isUL = ae == StrIntrinsicNode::UL;
*** 632,642 ****
        fmovd(tmp2, vtmp);
      }
      adds(cnt2, cnt2, isUL ? 4 : 8);
      br(GE, TAIL);
      eor(rscratch2, tmp1, tmp2);
!     cbnz(rscratch2, DIFFERENCE);
      // main loop
      bind(NEXT_WORD);
      if (str1_isL == str2_isL) {
        ldr(tmp1, Address(str1, cnt2));
        ldr(tmp2, Address(str2, cnt2));
--- 632,642 ----
        fmovd(tmp2, vtmp);
      }
      adds(cnt2, cnt2, isUL ? 4 : 8);
      br(GE, TAIL);
      eor(rscratch2, tmp1, tmp2);
!     cbnz(rscratch2, DIFF);
      // main loop
      bind(NEXT_WORD);
      if (str1_isL == str2_isL) {
        ldr(tmp1, Address(str1, cnt2));
        ldr(tmp2, Address(str2, cnt2));
*** 658,671 ****
      }
      br(GE, TAIL);
  
      eor(rscratch2, tmp1, tmp2);
      cbz(rscratch2, NEXT_WORD);
!     b(DIFFERENCE);
      bind(TAIL);
      eor(rscratch2, tmp1, tmp2);
!     cbnz(rscratch2, DIFFERENCE);
      // Last longword.  In the case where length == 4 we compare the
      // same longword twice, but that's still faster than another
      // conditional branch.
      if (str1_isL == str2_isL) {
        ldr(tmp1, Address(str1));
--- 658,671 ----
      }
      br(GE, TAIL);
  
      eor(rscratch2, tmp1, tmp2);
      cbz(rscratch2, NEXT_WORD);
!     b(DIFF);
      bind(TAIL);
      eor(rscratch2, tmp1, tmp2);
!     cbnz(rscratch2, DIFF);
      // Last longword.  In the case where length == 4 we compare the
      // same longword twice, but that's still faster than another
      // conditional branch.
      if (str1_isL == str2_isL) {
        ldr(tmp1, Address(str1));
*** 685,695 ****
      eor(rscratch2, tmp1, tmp2);
      cbz(rscratch2, DONE);
  
      // Find the first different characters in the longwords and
      // compute their difference.
!     bind(DIFFERENCE);
      rev(rscratch2, rscratch2);
      clz(rscratch2, rscratch2);
      andr(rscratch2, rscratch2, isLL ? -8 : -16);
      lsrv(tmp1, tmp1, rscratch2);
      (this->*ext_chr)(tmp1, tmp1);
--- 685,695 ----
      eor(rscratch2, tmp1, tmp2);
      cbz(rscratch2, DONE);
  
      // Find the first different characters in the longwords and
      // compute their difference.
!     bind(DIFF);
      rev(rscratch2, rscratch2);
      clz(rscratch2, rscratch2);
      andr(rscratch2, rscratch2, isLL ? -8 : -16);
      lsrv(tmp1, tmp1, rscratch2);
      (this->*ext_chr)(tmp1, tmp1);