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8190869: C2: missing strength reduction of Math.pow(x, 2.0D) to x*x

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Reviewed-by: kvn
This commit is contained in:
Vladimir Ivanov 2017-12-13 19:32:48 +03:00
parent 3541733024
commit 0c05e5a478
2 changed files with 25 additions and 3 deletions
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15
src/hotspot/share/opto/library_call.cpp
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@ -1789,10 +1789,19 @@ bool LibraryCallKit::inline_math_native(vmIntrinsics::ID id) {
return StubRoutines::dexp() != NULL ?
runtime_math(OptoRuntime::Math_D_D_Type(), StubRoutines::dexp(), "dexp") :
runtime_math(OptoRuntime::Math_D_D_Type(), FN_PTR(SharedRuntime::dexp), "EXP");
case vmIntrinsics::_dpow:
return StubRoutines::dpow() != NULL ?
runtime_math(OptoRuntime::Math_DD_D_Type(), StubRoutines::dpow(), "dpow") :
case vmIntrinsics::_dpow: {
Node* exp = round_double_node(argument(2));
const TypeD* d = _gvn.type(exp)->isa_double_constant();
if (d != NULL && d->getd() == 2.0) {
// Special case: pow(x, 2.0) => x * x
Node* base = round_double_node(argument(0));
set_result(_gvn.transform(new MulDNode(base, base)));
return true;
}
return StubRoutines::dexp() != NULL ?
runtime_math(OptoRuntime::Math_DD_D_Type(), StubRoutines::dpow(), "dpow") :
runtime_math(OptoRuntime::Math_DD_D_Type(), FN_PTR(SharedRuntime::dpow), "POW");
}
#undef FN_PTR
// These intrinsics are not yet correctly implemented