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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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29
hotspot/src/cpu/x86/vm/c1_LIRGenerator_x86.cpp
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@ -823,7 +823,7 @@ void LIRGenerator::do_CompareAndSwap(Intrinsic* x, ValueType* type) {
void LIRGenerator::do_MathIntrinsic(Intrinsic* x) {
assert(x->number_of_arguments() == 1, "wrong type");
assert(x->number_of_arguments() == 1 || (x->number_of_arguments() == 2 && x->id() == vmIntrinsics::_dpow), "wrong type");
LIRItem value(x->argument_at(0), this);
bool use_fpu = false;
@ -834,6 +834,8 @@ void LIRGenerator::do_MathIntrinsic(Intrinsic* x) {
case vmIntrinsics::_dtan:
case vmIntrinsics::_dlog:
case vmIntrinsics::_dlog10:
case vmIntrinsics::_dexp:
case vmIntrinsics::_dpow:
use_fpu = true;
}
} else {
@ -843,20 +845,37 @@ void LIRGenerator::do_MathIntrinsic(Intrinsic* x) {
value.load_item();
LIR_Opr calc_input = value.result();
LIR_Opr calc_input2 = NULL;
if (x->id() == vmIntrinsics::_dpow) {
LIRItem extra_arg(x->argument_at(1), this);
if (UseSSE < 2) {
extra_arg.set_destroys_register();
}
extra_arg.load_item();
calc_input2 = extra_arg.result();
}
LIR_Opr calc_result = rlock_result(x);
// sin and cos need two free fpu stack slots, so register two temporary operands
// sin, cos, pow and exp need two free fpu stack slots, so register
// two temporary operands
LIR_Opr tmp1 = FrameMap::caller_save_fpu_reg_at(0);
LIR_Opr tmp2 = FrameMap::caller_save_fpu_reg_at(1);
if (use_fpu) {
LIR_Opr tmp = FrameMap::fpu0_double_opr;
int tmp_start = 1;
if (calc_input2 != NULL) {
__ move(calc_input2, tmp);
tmp_start = 2;
calc_input2 = tmp;
}
__ move(calc_input, tmp);
calc_input = tmp;
calc_result = tmp;
tmp1 = FrameMap::caller_save_fpu_reg_at(1);
tmp2 = FrameMap::caller_save_fpu_reg_at(2);
tmp1 = FrameMap::caller_save_fpu_reg_at(tmp_start);
tmp2 = FrameMap::caller_save_fpu_reg_at(tmp_start + 1);
}
switch(x->id()) {
@ -867,6 +886,8 @@ void LIRGenerator::do_MathIntrinsic(Intrinsic* x) {
case vmIntrinsics::_dtan: __ tan (calc_input, calc_result, tmp1, tmp2); break;
case vmIntrinsics::_dlog: __ log (calc_input, calc_result, tmp1); break;
case vmIntrinsics::_dlog10: __ log10(calc_input, calc_result, tmp1); break;
case vmIntrinsics::_dexp: __ exp (calc_input, calc_result, tmp1, tmp2, FrameMap::rax_opr, FrameMap::rcx_opr, FrameMap::rdx_opr); break;
case vmIntrinsics::_dpow: __ pow (calc_input, calc_input2, calc_result, tmp1, tmp2, FrameMap::rax_opr, FrameMap::rcx_opr, FrameMap::rdx_opr); break;
default: ShouldNotReachHere();
}