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Re: [tree-ssa mudflap] ignore-reads speedup, bug fixes
- From: law at redhat dot com
- To: "Frank Ch. Eigler" <fche at redhat dot com>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Tue, 03 Feb 2004 01:37:55 -0700
- Subject: Re: [tree-ssa mudflap] ignore-reads speedup, bug fixes
- Reply-to: law at redhat dot com
In message <20040130212846.GA12214@redhat.com>, "Frank Ch. Eigler" writes:
>Hi -
>
>The following patch does several things. The biggest is adding
>a "don't instrument reads" suboption to the compiler, which basically
>tells it not to instrument pointer *reads*. For some baby benchmarks,
>this change can speed up a fully instrumented program by a factor of two,
>making it "only" a factor of two slower than an uninstrumented one.
On big stuff (say GCC itself) being able to ignore reads can easily be
the difference between something that runs in a minute or two or runs
for an hour or more.
jeff