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7133857: exp() and pow() should use the x87 ISA on x86

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Use x87 instructions to implement exp() and pow() in interpreter/c1/c2.

Reviewed-by: kvn, never, twisti
This commit is contained in:
Roland Westrelin 2012-05-15 10:10:23 +02:00
parent eb4a860bc3
commit b305cf722e
26 changed files with 783 additions and 279 deletions
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24
hotspot/src/cpu/x86/vm/assembler_x86.hpp
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@ -1148,6 +1148,9 @@ private:
void fxsave(Address dst);
void fyl2x();
void frndint();
void f2xm1();
void fldl2e();
void hlt();
@ -2387,7 +2390,28 @@ class MacroAssembler: public Assembler {
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); }