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8139041: Redundant DMB instructions

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Merge consecutive DMB intstructions

Reviewed-by: roland, kvn, twisti
This commit is contained in:
Andrew Haley 2015-10-13 16:25:50 +00:00
parent c1408bb0c8
commit 3ceb2dbcc2
4 changed files with 45 additions and 0 deletions
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7
hotspot/src/share/vm/asm/codeBuffer.hpp
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@ -375,6 +375,8 @@ class CodeBuffer: public StackObj {
OopRecorder _default_oop_recorder; // override with initialize_oop_recorder
Arena* _overflow_arena;
address _last_membar; // used to merge consecutive memory barriers
address _decode_begin; // start address for decode
address decode_begin();
@ -388,6 +390,7 @@ class CodeBuffer: public StackObj {
_decode_begin = NULL;
_overflow_arena = NULL;
_code_strings = CodeStrings();
_last_membar = NULL;
}
void initialize(address code_start, csize_t code_size) {
@ -577,6 +580,10 @@ class CodeBuffer: public StackObj {
OopRecorder* oop_recorder() const { return _oop_recorder; }
CodeStrings& strings() { return _code_strings; }
address last_membar() const { return _last_membar; }
void set_last_membar(address a) { _last_membar = a; }
void clear_last_membar() { set_last_membar(NULL); }
void free_strings() {
if (!_code_strings.is_null()) {
_code_strings.free(); // sets _strings Null as a side-effect.