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Re: [Bug target/33431] New: [SH4] performance regression between 3.4.6 and 4.x
- From: Andrew STUBBS <andrew dot stubbs at st dot com>
- To: gcc-bugzilla at gcc dot gnu dot org
- Cc: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 17 Sep 2007 11:29:23 +0100
- Subject: Re: [Bug target/33431] New: [SH4] performance regression between 3.4.6 and 4.x
- References: <email@example.com/bugzilla/>
nbkolchin at gmail dot com wrote:
Our target hardware has SH7750 processor running in little endian mode under
RTEMS. Unfortunetaly there is no way to boot linux there.
After lurking inside backend sources, I found that m4 has several variants in
GCC 4.x: m4-100, m4-200, etc. I've tried to compile this tests with m4-200
switch, but it looks like m4-200 enforces big-endian.
The 7750 has direct mapped caches and so is not the best platform for
benchmarking. A slight code perturbation can give a large change in
The m4-200 option is NOT suitable for that target. The 7750 is a 100
series core (not that that was a nomenclature that existed when it came
out). As far as I know, anybody that has a 200 series or above has an
official ST toolset to go with it (GCC of course).