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Re: Your change of September 11, 1998
- To: rth at redhat dot com
- Subject: Re: Your change of September 11, 1998
- From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
- Date: Tue, 16 Jan 01 08:20:00 EST
- Cc: gcc at gcc dot gnu dot org
We scan backwards from the end of a block. If we see a register used,
and it had been dead, it becomes live. If a register is either set or
clobbered -- we do not care which -- it becomes dead.
I guess that's true. I'm just concerned about having a situation where
a phase of the compiler can think a register is dead when it isn't.