| commit | 8933292b1a9a6abde40ff4ea315b1e01ebd75581 | |
| author | Douglas Katzman <dougk@google.com> | |
| Thu, 30 Nov 2017 20:59:38 +0000 (30 15:59 -0500) | ||
| committer | Douglas Katzman <dougk@google.com> | |
| Thu, 30 Nov 2017 21:08:02 +0000 (30 16:08 -0500) | ||
| tree | add82344e626f1afebb817507ac791e0f91adecd | treesnapshot (tar.gz zip) |
| parent | 7dd21702489f2672480975cc1ce5c1b9927ebf2e | commitdiff |
x86-64: Prefer RIP-relative mode for accessing assembly tramps
More work to defrag, but less work to relocate spaces
(in reality there are < 1 dozen affected instructions)
However, the win is that intra-varyobj-space opaque pointers (ones not seen
by GC) are all space-relative, so as long as fixedobj space does not need
relocation, the varyobj space can move anywhere with no fixups internal to
that space. We must fix pointers into it of course.
More work to defrag, but less work to relocate spaces
(in reality there are < 1 dozen affected instructions)
However, the win is that intra-varyobj-space opaque pointers (ones not seen
by GC) are all space-relative, so as long as fixedobj space does not need
relocation, the varyobj space can move anywhere with no fixups internal to
that space. We must fix pointers into it of course.