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    • sgjesse@chromium.org's avatar
      Extend the maximum size map space · 44b7c59e
      sgjesse@chromium.org authored
      On 32-bit the maps are now aligned on a 32-byte boundary in order to encode more maps during compacting GC. The actual size of a map on 32-bit is 28 bytes making this change waste 4 bytes per map.
      
      On 64-bit the encoding for compacting GC is now using more than 32-bits and the maps here are still pointer size aligned. The actual size of a map on 64-bit is 48 bytes and this change does not intruduce any waste.
      
      My choice of 16 bits for kMapPageIndexBits for 64-bit should give the same maximum number of pages (8K) for map space. As maps on 64-bit are larger than on 32-bit the total number of maps on 64-bit will be smaller than on 32-bit. We could consider raising this to 17 or 18.
      
      I moved the kPageSizeBits to globals.h as the calculation of the encoding really depended on this.
      
      There are still an #ifdef/#endif in objects.h and this constant could be moved to globaks.h as well, but I kept it together with the related constants.
      
      All the tests run in debug mode with additional options --gc-global --always-compact as well (except for a few tests on which also fails before this change when run with --gc-global --always-compact).
      
      BUG=http://code.google.com/p/v8/issues/detail?id=524
      BUG=http://crbug.com/29428
      TEST=test/mjsunit/regress/regress-524.js
      
      Review URL: http://codereview.chromium.org/504026
      
      git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3481 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
      44b7c59e
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