Mercurial > hg > truffle

comparison src/share/vm/opto/machnode.cpp @ 6848:8e47bac5643a

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
7054512: Compress class pointers after perm gen removal Summary: support of compress class pointers in the compilers. Reviewed-by: kvn, twisti
author roland
date Tue, 09 Oct 2012 10:11:38 +0200
parents da91efe96a93
children a7114d3d712e
comparison
equal deleted inserted replaced
6847:65d07d9ee446 6848:8e47bac5643a
263 int scale = oper->scale(); 263 int scale = oper->scale();
264 // Now we have collected every part of the ADLC MEMORY_INTER. 264 // Now we have collected every part of the ADLC MEMORY_INTER.
265 // See if it adds up to a base + offset. 265 // See if it adds up to a base + offset.
266 if (index != NULL) { 266 if (index != NULL) {
267 const Type* t_index = index->bottom_type(); 267 const Type* t_index = index->bottom_type();
268 if (t_index->isa_narrowoop()) { // EncodeN, LoadN, LoadConN, LoadNKlass. 268 if (t_index->isa_narrowoop() || t_index->isa_narrowklass()) { // EncodeN, LoadN, LoadConN, LoadNKlass,
269 // EncodeNKlass, LoadConNklass.
269 // Memory references through narrow oops have a 270 // Memory references through narrow oops have a
270 // funny base so grab the type from the index: 271 // funny base so grab the type from the index:
271 // [R12 + narrow_oop_reg<<3 + offset] 272 // [R12 + narrow_oop_reg<<3 + offset]
272 assert(base == NULL, "Memory references through narrow oops have no base"); 273 assert(base == NULL, "Memory references through narrow oops have no base");
273 offset = disp; 274 offset = disp;
350 const Type* t = base->bottom_type(); 351 const Type* t = base->bottom_type();
351 if (UseCompressedOops && Universe::narrow_oop_shift() == 0) { 352 if (UseCompressedOops && Universe::narrow_oop_shift() == 0) {
352 // 32-bit unscaled narrow oop can be the base of any address expression 353 // 32-bit unscaled narrow oop can be the base of any address expression
353 t = t->make_ptr(); 354 t = t->make_ptr();
354 } 355 }
356 if (UseCompressedKlassPointers && Universe::narrow_klass_shift() == 0) {
357 // 32-bit unscaled narrow oop can be the base of any address expression
358 t = t->make_ptr();
359 }
355 if (t->isa_intptr_t() && offset != 0 && offset != Type::OffsetBot) { 360 if (t->isa_intptr_t() && offset != 0 && offset != Type::OffsetBot) {
356 // We cannot assert that the offset does not look oop-ish here. 361 // We cannot assert that the offset does not look oop-ish here.
357 // Depending on the heap layout the cardmark base could land 362 // Depending on the heap layout the cardmark base could land
358 // inside some oopish region. It definitely does for Win2K. 363 // inside some oopish region. It definitely does for Win2K.
359 // The sum of cardmark-base plus shift-by-9-oop lands outside 364 // The sum of cardmark-base plus shift-by-9-oop lands outside