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6823354: Add intrinsics for {Integer,Long}.{numberOfLeadingZeros,numberOfTrailingZeros}()

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These methods can be instrinsified by using bit scan, bit test, and population count instructions.

Reviewed-by: kvn, never
This commit is contained in:
Christian Thalinger 2009-05-06 00:27:52 -07:00
parent 716c78f080
commit 6a270f9f19
15 changed files with 997 additions and 17 deletions
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8
hotspot/src/share/vm/classfile/vmSymbols.hpp
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@ -313,6 +313,8 @@
template(value_name, "value") \
template(frontCacheEnabled_name, "frontCacheEnabled") \
template(stringCacheEnabled_name, "stringCacheEnabled") \
template(numberOfLeadingZeros_name, "numberOfLeadingZeros") \
template(numberOfTrailingZeros_name, "numberOfTrailingZeros") \
template(bitCount_name, "bitCount") \
template(profile_name, "profile") \
template(equals_name, "equals") \
@ -559,6 +561,12 @@
do_intrinsic(_longBitsToDouble, java_lang_Double, longBitsToDouble_name, long_double_signature, F_S) \
do_name( longBitsToDouble_name, "longBitsToDouble") \
\
do_intrinsic(_numberOfLeadingZeros_i, java_lang_Integer, numberOfLeadingZeros_name,int_int_signature, F_S) \
do_intrinsic(_numberOfLeadingZeros_l, java_lang_Long, numberOfLeadingZeros_name,long_int_signature, F_S) \
\
do_intrinsic(_numberOfTrailingZeros_i, java_lang_Integer, numberOfTrailingZeros_name,int_int_signature, F_S) \
do_intrinsic(_numberOfTrailingZeros_l, java_lang_Long, numberOfTrailingZeros_name,long_int_signature, F_S) \
\
do_intrinsic(_bitCount_i, java_lang_Integer, bitCount_name, int_int_signature, F_S) \
do_intrinsic(_bitCount_l, java_lang_Long, bitCount_name, long_int_signature, F_S) \
\