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Re: [PATCH] Fixes tree-loop-distribute-patterns issues
- From: "Joseph S. Myers" <joseph at codesourcery dot com>
- To: OndÅej BÃlka <neleai at seznam dot cz>
- Cc: Roland McGrath <roland at hack dot frob dot com>, Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>, Carlos O'Donell <carlos at redhat dot com>, "GNU C. Library" <libc-alpha at sourceware dot org>, Siddhesh Poyarekar <siddhesh at redhat dot com>
- Date: Thu, 20 Jun 2013 22:33:21 +0000
- Subject: Re: [PATCH] Fixes tree-loop-distribute-patterns issues
- References: <51C0AFB7 dot 1060009 at linux dot vnet dot ibm dot com> <20130618205608 dot 9CCE22C0AC at topped-with-meat dot com> <51C1BFE9 dot 4070805 at linux dot vnet dot ibm dot com> <51C1CEFC dot 9000100 at redhat dot com> <51C1FE4C dot 3020400 at linux dot vnet dot ibm dot com> <20130619221130 dot 7B91A2C10E at topped-with-meat dot com> <51C31177 dot 90303 at linux dot vnet dot ibm dot com> <20130620175832 dot 0E6FA2C133 at topped-with-meat dot com> <20130620213141 dot GA4833 at domone dot kolej dot mff dot cuni dot cz>
On Thu, 20 Jun 2013, Ondrej Bilka wrote:
> Actually you should split simple_* to separate files and compile them with
> O0.
>
> Doing otherwise makes their performance dependent on gcc version and
> this makes results even more unreliable.
I expect -O0 performance to depend a lot more on GCC version than -O2.
--
Joseph S. Myers
joseph@codesourcery.com