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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/opto/matcher.hpp
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@ -225,10 +225,16 @@ public:
OptoRegPair *_parm_regs; // Array of machine registers per argument
RegMask *_calling_convention_mask; // Array of RegMasks per argument
// Does matcher support this ideal node?
// Does matcher have a match rule for this ideal node?
static const bool has_match_rule(int opcode);
static const bool _hasMatchRule[_last_opcode];
// Does matcher have a match rule for this ideal node and is the
// predicate (if there is one) true?
// NOTE: If this function is used more commonly in the future, ADLC
// should generate this one.
static const bool match_rule_supported(int opcode);
// Used to determine if we have fast l2f conversion
// USII has it, USIII doesn't
static const bool convL2FSupported(void);