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Re: C6X port 4/11: Backtracking scheduler
- From: Hans-Peter Nilsson <hp at bitrange dot com>
- To: Bernd Schmidt <bernds at codesourcery dot com>
- Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>
- Date: Wed, 25 May 2011 04:47:26 -0400 (EDT)
- Subject: Re: C6X port 4/11: Backtracking scheduler
- References: <4DC956D0.3040306@codesourcery.com> <4DC95ADB.1010408@codesourcery.com>
On Tue, 10 May 2011, Bernd Schmidt wrote:
> On C6X, every jump instruction has 5 delay slots which can be filled
> with normally scheduled instructions. With an issue width of 8
> insns/cycle, this means that up to 40 insns can be issued after the jump
> insn before the jump's side-effect takes place. I didn't particularaly
> feel like using reorg.c to deal with this,
No kidding... multi-delay-slot bugs just waiting for you...
> hence these scheduler patches.
THANK YOU for these first steps!
brgds, H-P