src/cpu/x86/vm/assembler_x86.hpp

rev 3227 : 7133857: exp() and pow() should use the x87 ISA on x86
Summary: use x87 instructions to implement exp() and pow() in interpreter/c1/c2.
Reviewed-by:

*** 1146,1155 ****
--- 1146,1158 ----
    void fxrstor(Address src);
  
    void fxsave(Address dst);
  
    void fyl2x();
+   void frndint();
+   void f2xm1();
+   void fldl2e();
  
    void hlt();
  
    void idivl(Register src);
    void divl(Register src); // Unsigned division
*** 2385,2395 ****
--- 2388,2419 ----
    void fmul_s(AddressLiteral src) { Assembler::fmul_s(as_Address(src)); }
  
    void ldmxcsr(Address src) { Assembler::ldmxcsr(src); }
    void ldmxcsr(AddressLiteral src);
  
+   // compute pow(x,y) and exp(x) with x86 instructions. Don't cover
+   // all corner cases and may result in NaN and require fallback to a
+   // runtime call.
+   void fast_pow();
+   void fast_exp();
+ 
+   // computes exp(x). Fallback to runtime call included.
+   void exp_with_fallback(int num_fpu_regs_in_use) { pow_or_exp(true, num_fpu_regs_in_use); }
+   // computes pow(x,y). Fallback to runtime call included.
+   void pow_with_fallback(int num_fpu_regs_in_use) { pow_or_exp(false, num_fpu_regs_in_use); }
+ 
  private:
+ 
+   // call runtime as a fallback for trig functions and pow/exp.
+   void fp_runtime_fallback(address runtime_entry, int nb_args, int num_fpu_regs_in_use);
+ 
+   // computes 2^(Ylog2X); Ylog2X in ST(0)
+   void pow_exp_core_encoding();
+ 
+   // computes pow(x,y) or exp(x). Fallback to runtime call included.
+   void pow_or_exp(bool is_exp, int num_fpu_regs_in_use);
+ 
    // these are private because users should be doing movflt/movdbl
  
    void movss(Address dst, XMMRegister src)     { Assembler::movss(dst, src); }
    void movss(XMMRegister dst, XMMRegister src) { Assembler::movss(dst, src); }
    void movss(XMMRegister dst, Address src)     { Assembler::movss(dst, src); }