tree 9ac3f6390ae6c3458ced4e6b8a42aae4c6d59e24
parent 0b6941ee8667b5c92b0c553be14d3a1d8183c70d
author sewardj <sewardj@a5019735-40e9-0310-863c-91ae7b9d1cf9> 1129111763 +0000
committer sewardj <sewardj@a5019735-40e9-0310-863c-91ae7b9d1cf9> 1129111763 +0000


Redo the way cachegrind generates instrumentation code, so that it can
deal with any IR that happens to show up.  This makes it work on ppc32
and should fix occasionally-reported bugs on x86/amd64 where it bombs
due to having to deal with multiple date references in a single
instruction.

The new scheme is based around the idea of a queue of memory events
which are outstanding, in the sense that no IR has yet been generated
to do the relevant helper calls.  The presence of the queue --
currently 16 entries deep -- gives cachegrind more scope for combining
multiple memory references into a single helper function call.  As a
result it runs 3%-5% faster than the previous version, on x86.

This commit also changes the type of the tool interface function
'tool_discard_basic_block_info' and clarifies its meaning.  See
comments in include/pub_tool_tooliface.h.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@4903 a5019735-40e9-0310-863c-91ae7b9d1cf9