Even although the Arm64 specification specifies that csp
only needs to be aligned to 16 bytes if it is dereferenced, some
implementations show poor performance.
Also makes the following change:
- Enable CPU support for arm64 to enable probing of cpu implementer and cpu part.
- Add ALWAYS_ALIGN_CSP CpuFeature for Arm64 and set it based on runtime probing of the cpu imp
- Rename PrepareForPush and PrepareForPop to PushPreamble and PopPostamble and move PopPostabl
Original Review URL: https://codereview.chromium.org/264773004R=ulan@chromium.org
Review URL: https://codereview.chromium.org/271543004
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21221 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Even although the Arm64 specification specifies that csp
only needs to be aligned to 16 bytes if it is dereferenced, some implementations show poor performance if csp is every set to a non-aligned value. This CL ensures that csp is always aligned to 16 byte values on these platforms and adds checks to ensure this in debug mode.
Also makes the following change:
- Enable CPU support for arm64 to enable probing of cpu implementer and cpu part.
- Add ALWAYS_ALIGN_CSP CpuFeature for Arm64 and set it based on runtime probing of the cpu implementer.
- Rename PrepareForPush and PrepareForPop to PushPreamble and PopPostamble and move PopPostable after the pop.
-
R=jacob.bramley@arm.com, ulan@chromium.org
Review URL: https://codereview.chromium.org/264773004
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21177 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This disentagles the initialization/dependency mess quite a bit and
makes things vastly simpler. If the 'mrs' on every flush is too
expensive (which it is hopefully not), the cache line sizes will have
to be instance variables of the CPU class and FlushICache will have to
be a member function. This would involve some more or less tricky
refactorings, which we shouldn't do until we are *really* forced to
do.
BUG=359977
LOG=y
R=rodolph.perfetta@gmail.com
Review URL: https://codereview.chromium.org/269543016
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@21119 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
