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8005522: use fast-string instructions on x86 for zeroing

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Use 'rep stosb' instead of 'rep stosq' when fast-string operations are available.

Reviewed-by: twisti, roland
This commit is contained in:
Vladimir Kozlov 2013-01-03 15:09:55 -08:00
parent 73d6d417be
commit cfcd28fd9d
10 changed files with 95 additions and 22 deletions
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3
hotspot/src/cpu/x86/vm/macroAssembler_x86.hpp
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@ -1096,6 +1096,9 @@ public:
// C2 compiled method's prolog code.
void verified_entry(int framesize, bool stack_bang, bool fp_mode_24b);
// clear memory of size 'cnt' qwords, starting at 'base'.
void clear_mem(Register base, Register cnt, Register rtmp);
// IndexOf strings.
// Small strings are loaded through stack if they cross page boundary.
void string_indexof(Register str1, Register str2,