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comparison src/cpu/x86/vm/interp_masm_x86_64.cpp @ 113:ba764ed4b6f2

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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
author coleenp
date Sun, 13 Apr 2008 17:43:42 -0400
parents a61af66fc99e
children 6d172e3548cb 37f87013dfd8
comparison
equal deleted inserted replaced
110:a49a647afe9a 113:ba764ed4b6f2
265 movl(rcx, Address(rdi, arrayOopDesc::length_offset_in_bytes())); 265 movl(rcx, Address(rdi, arrayOopDesc::length_offset_in_bytes()));
266 // Skip to start of data; also clear Z flag incase rcx is zero 266 // Skip to start of data; also clear Z flag incase rcx is zero
267 addq(rdi, arrayOopDesc::base_offset_in_bytes(T_OBJECT)); 267 addq(rdi, arrayOopDesc::base_offset_in_bytes(T_OBJECT));
268 // Scan rcx words at [rdi] for occurance of rax 268 // Scan rcx words at [rdi] for occurance of rax
269 // Set NZ/Z based on last compare 269 // Set NZ/Z based on last compare
270 repne_scan(); 270
271 // Not equal? 271 // this part is kind tricky, as values in supers array could be 32 or 64 bit wide
272 jcc(Assembler::notEqual, not_subtype); 272 // and we store values in objArrays always encoded, thus we need to encode value
273 // before repne
274 if (UseCompressedOops) {
275 encode_heap_oop(rax);
276 repne_scanl();
277 // Not equal?
278 jcc(Assembler::notEqual, not_subtype);
279 // decode heap oop here for movq
280 decode_heap_oop(rax);
281 } else {
282 repne_scanq();
283 jcc(Assembler::notEqual, not_subtype);
284 }
273 // Must be equal but missed in cache. Update cache. 285 // Must be equal but missed in cache. Update cache.
274 movq(Address(Rsub_klass, sizeof(oopDesc) + 286 movq(Address(Rsub_klass, sizeof(oopDesc) +
275 Klass::secondary_super_cache_offset_in_bytes()), rax); 287 Klass::secondary_super_cache_offset_in_bytes()), rax);
276 jmp(ok_is_subtype); 288 jmp(ok_is_subtype);
277 289
278 bind(not_subtype); 290 bind(not_subtype);
291 // decode heap oop here for miss
292 if (UseCompressedOops) decode_heap_oop(rax);
279 profile_typecheck_failed(rcx); // blows rcx 293 profile_typecheck_failed(rcx); // blows rcx
280 } 294 }
281 295
282 296
283 // Java Expression Stack 297 // Java Expression Stack