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comparison src/cpu/sparc/vm/copy_sparc.hpp @ 3892:baf763f388e6

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7059037: Use BIS for zeroing on T4 Summary: Use BIS for zeroing new allocated big (2Kb and more) objects and arrays. Reviewed-by: never, twisti, ysr
author kvn
date Fri, 26 Aug 2011 08:52:22 -0700
parents f95d63e2154a
children 16f9fa2bf76c
comparison
equal deleted inserted replaced
3891:ac8738449b6f 3892:baf763f388e6
154 *to++ = value; 154 *to++ = value;
155 } 155 }
156 #endif // _LP64 156 #endif // _LP64
157 } 157 }
158 158
159 typedef void (*_zero_Fn)(HeapWord* to, size_t count);
160
159 static void pd_fill_to_aligned_words(HeapWord* tohw, size_t count, juint value) { 161 static void pd_fill_to_aligned_words(HeapWord* tohw, size_t count, juint value) {
160 assert(MinObjAlignmentInBytes >= BytesPerLong, "need alternate implementation"); 162 assert(MinObjAlignmentInBytes >= BytesPerLong, "need alternate implementation");
161 163
164 if (value == 0 && UseBlockZeroing &&
165 (count > (BlockZeroingLowLimit >> LogHeapWordSize))) {
166 // Call it only when block zeroing is used
167 ((_zero_Fn)StubRoutines::zero_aligned_words())(tohw, count);
168 } else {
162 julong* to = (julong*)tohw; 169 julong* to = (julong*)tohw;
163 julong v = ((julong)value << 32) | value; 170 julong v = ((julong)value << 32) | value;
164 // If count is odd, odd will be equal to 1 on 32-bit platform 171 // If count is odd, odd will be equal to 1 on 32-bit platform
165 // and be equal to 0 on 64-bit platform. 172 // and be equal to 0 on 64-bit platform.
166 size_t odd = count % (BytesPerLong / HeapWordSize) ; 173 size_t odd = count % (BytesPerLong / HeapWordSize) ;
174 assert(count == odd, "bad bounds on loop filling to aligned words"); 181 assert(count == odd, "bad bounds on loop filling to aligned words");
175 if (odd) { 182 if (odd) {
176 *((juint*)to) = value; 183 *((juint*)to) = value;
177 184
178 } 185 }
186 }
179 } 187 }
180 188
181 static void pd_fill_to_bytes(void* to, size_t count, jubyte value) { 189 static void pd_fill_to_bytes(void* to, size_t count, jubyte value) {
182 (void)memset(to, value, count); 190 (void)memset(to, value, count);
183 } 191 }