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6814552: par compact - some compilers fail to optimize bitmap code

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Reviewed-by: tonyp, iveresov, jmasa, ysr
This commit is contained in:
John Coomes 2009-06-07 22:08:24 -07:00
parent 70fe3ca4f5
commit 10002fa2ff
1 changed files with 3 additions and 2 deletions
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5
hotspot/src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.hpp
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@ -177,6 +177,7 @@ private:
// are double-word aligned in 32-bit VMs, but not in 64-bit VMs, so the 32-bit // are double-word aligned in 32-bit VMs, but not in 64-bit VMs, so the 32-bit
// granularity is 2, 64-bit is 1. // granularity is 2, 64-bit is 1.
static inline size_t obj_granularity() { return size_t(MinObjAlignment); } static inline size_t obj_granularity() { return size_t(MinObjAlignment); }
static inline int obj_granularity_shift() { return LogMinObjAlignment; }
HeapWord* _region_start; HeapWord* _region_start;
size_t _region_size; size_t _region_size;
@ -299,13 +300,13 @@ inline bool ParMarkBitMap::is_unmarked(oop obj) const
inline size_t inline size_t
ParMarkBitMap::bits_to_words(idx_t bits) ParMarkBitMap::bits_to_words(idx_t bits)
{ {
return bits * obj_granularity(); return bits << obj_granularity_shift();
} }
inline ParMarkBitMap::idx_t inline ParMarkBitMap::idx_t
ParMarkBitMap::words_to_bits(size_t words) ParMarkBitMap::words_to_bits(size_t words)
{ {
return words / obj_granularity(); return words >> obj_granularity_shift();
} }
inline size_t ParMarkBitMap::obj_size(idx_t beg_bit, idx_t end_bit) const inline size_t ParMarkBitMap::obj_size(idx_t beg_bit, idx_t end_bit) const