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Re: [tree-ssa]: Reduce size of phi nodes by 31 bits

From: Daniel Berlin <dberlin at dberlin dot org>
To: law at redhat dot com
Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>,Diego Novillo <dnovillo at redhat dot com>
Date: Tue, 6 Jan 2004 10:01:16 -0500
Subject: Re: [tree-ssa]: Reduce size of phi nodes by 31 bits
References: <200401060635.i066ZomO012080@speedy.slc.redhat.com>

On Jan 6, 2004, at 1:35 AM, law@redhat.com wrote:

In message <CA51D1BD-3A5C-11D8-8825-000A95DA505C@dberlin.org>, Daniel Berlin wr ites:
We only ever set rewritten to be 1 or 0.
I noticed this when someone else asked me about phi nodes and i had to
lookup the structure.
Bootstrapped and regtested on i686
As Richard said, this isn't actually going to save any space.

I was joking about the immediate space savings. However, as I pointed out, someone will later want to add another flag to phi nodes, and if we don't make it a bitfield, *then* we'll lose some space.

This happened on the lno-branch. Sebastian added a marked flag. Luckily, he applied this patch so that we didn't waste another 4 bytes.

References:
- Re: [tree-ssa]: Reduce size of phi nodes by 31 bits
  - From: law

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