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:

@@ -1146,10 +1146,13 @@
   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

@@ -1631,10 +1634,13 @@
 
 class MacroAssembler: public Assembler {
   friend class LIR_Assembler;
   friend class Runtime1;      // as_Address()
 
+  // 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);
+
  protected:
 
   Address as_Address(AddressLiteral adr);
   Address as_Address(ArrayAddress adr);
 

@@ -2385,10 +2391,20 @@
   void fmul_s(AddressLiteral src) { Assembler::fmul_s(as_Address(src)); }
 
   void ldmxcsr(Address src) { Assembler::ldmxcsr(src); }
   void ldmxcsr(AddressLiteral src);
 
+  // computes 2^(Ylog2X); Ylog2X in ST(0)
+  void pow_exp_core_encoding();
+  // 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 pow(x,y) or exp(x). Fallback to runtime call included.
+  void pow_or_exp(bool is_exp, int num_fpu_regs_in_use);
+
 private:
   // 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); }