The toolchain build system now records the change in testsuite results between builds. For example:
Current trunk and the one built a week ago on x86_64: http://ex.seabright.co.nz/build/gcc-4.7~svn174684/logs/x86_64-maverick-cbuil...
GDB trunk and the one built a week ago on ARM: http://ex.seabright.co.nz/build/gdb-7.3~20110527+git3b12013/logs/armv7l-mave...
The changes in Chung-Lin's CoreMark commit: http://ex.seabright.co.nz/build/gcc-linaro-4.6+bzr106751/logs/armv7l-maveric...
The same between the feature branch and branch point: http://ex.seabright.co.nz/build/gcc-linaro-4.6+bzr106751~cltang~coremark-par...
I'll change the email that goes to gcc-testresults to include the diff which should make it easier to pick out regressions. I'll start sending the same to the GDB and binutils guys as well.
-- Michael