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7059037: Use BIS for zeroing on T4

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Use BIS for zeroing new allocated big (2Kb and more) objects and arrays.

Reviewed-by: never, twisti, ysr
This commit is contained in:
Vladimir Kozlov 2011-08-26 08:52:22 -07:00
parent 19f7fb98b8
commit 6446205688
14 changed files with 232 additions and 35 deletions
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32
hotspot/src/cpu/sparc/vm/stubGenerator_sparc.cpp
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@ -3069,6 +3069,34 @@ class StubGenerator: public StubCodeGenerator {
return start;
}
//
// Generate stub for heap zeroing.
// "to" address is aligned to jlong (8 bytes).
//
// Arguments for generated stub:
// to: O0
// count: O1 treated as signed (count of HeapWord)
// count could be 0
//
address generate_zero_aligned_words(const char* name) {
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", name);
address start = __ pc();
const Register to = O0; // source array address
const Register count = O1; // HeapWords count
const Register temp = O2; // scratch
Label Ldone;
__ sllx(count, LogHeapWordSize, count); // to bytes count
// Use BIS for zeroing
__ bis_zeroing(to, count, temp, Ldone);
__ bind(Ldone);
__ retl();
__ delayed()->nop();
return start;
}
void generate_arraycopy_stubs() {
address entry;
address entry_jbyte_arraycopy;
@ -3195,6 +3223,10 @@ class StubGenerator: public StubCodeGenerator {
StubRoutines::_arrayof_jbyte_fill = generate_fill(T_BYTE, true, "arrayof_jbyte_fill");
StubRoutines::_arrayof_jshort_fill = generate_fill(T_SHORT, true, "arrayof_jshort_fill");
StubRoutines::_arrayof_jint_fill = generate_fill(T_INT, true, "arrayof_jint_fill");
if (UseBlockZeroing) {
StubRoutines::_zero_aligned_words = generate_zero_aligned_words("zero_aligned_words");
}
}
void generate_initial() {