src/cpu/x86/vm/stubGenerator_x86_64.cpp

*** 3014,3036 ****
        __ movdbl(xmm0, Address(rsp, 0));
        __ addq(rsp, 8);
        __ ret(0);
      }
      {
-       StubCodeMark mark(this, "StubRoutines", "exp");
-       StubRoutines::_intrinsic_exp = (double (*)(double)) __ pc();
- 
-       __ subq(rsp, 8);
-       __ movdbl(Address(rsp, 0), xmm0);
-       __ fld_d(Address(rsp, 0));
-       __ exp_with_fallback(0);
-       __ fstp_d(Address(rsp, 0));
-       __ movdbl(xmm0, Address(rsp, 0));
-       __ addq(rsp, 8);
-       __ ret(0);
-     }
-     {
        StubCodeMark mark(this, "StubRoutines", "pow");
        StubRoutines::_intrinsic_pow = (double (*)(double,double)) __ pc();
  
        __ subq(rsp, 8);
        __ movdbl(Address(rsp, 0), xmm1);
--- 3014,3023 ----
*** 4057,4066 ****
--- 4044,4091 ----
      __ ret(0);
  
      return start;
    }
  
+   address generate_libmExp() {
+     address start = __ pc();
+ 
+     const XMMRegister x0  = xmm0;
+     const XMMRegister x1  = xmm1;
+     const XMMRegister x2  = xmm2;
+     const XMMRegister x3  = xmm3;
+ 
+     const XMMRegister x4  = xmm4;
+     const XMMRegister x5  = xmm5;
+     const XMMRegister x6  = xmm6;
+     const XMMRegister x7  = xmm7;
+ 
+     const Register tmp   = r11;
+    
+     BLOCK_COMMENT("Entry:");
+     __ enter(); // required for proper stackwalking of RuntimeStub frame
+ 
+ #ifdef _WIN64
+     // save the xmm registers which must be preserved 6-7
+     __ movdqu(xmm_save(6), as_XMMRegister(6));
+     __ movdqu(xmm_save(7), as_XMMRegister(7));
+ #endif
+       __ fast_exp(x0, x1, x2, x3, x4, x5, x6, x7, rax, rcx, rdx, tmp);
+ 
+ #ifdef _WIN64
+     // restore xmm regs belonging to calling function
+     __ movdqu(as_XMMRegister(6), xmm_save(6));
+     __ movdqu(as_XMMRegister(7), xmm_save(7));
+ #endif
+ 
+     __ leave(); // required for proper stackwalking of RuntimeStub frame
+     __ ret(0);
+ 
+     return start;
+ 
+   }
+ 
  
  #undef __
  #define __ masm->
  
    // Continuation point for throwing of implicit exceptions that are
*** 4237,4246 ****
--- 4262,4272 ----
      if (UseCRC32Intrinsics) {
        // set table address before stub generation which use it
        StubRoutines::_crc_table_adr = (address)StubRoutines::x86::_crc_table;
        StubRoutines::_updateBytesCRC32 = generate_updateBytesCRC32();
      }
+     StubRoutines::_dexp = generate_libmExp();
    }
  
    void generate_all() {
      // Generates all stubs and initializes the entry points