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Re: PATCH - [tree-ssa] regrouping of expression tree for single multiply add.
- From: Dale Johannesen <dalej at apple dot com>
- To: law at redhat dot com
- Cc: Roger Sayle <roger at eyesopen dot com>, Fariborz Jahanian <fjahanian at apple dot com>, Diego Novillo <dnovillo at redhat dot com>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>, Dale Johannesen <dalej at apple dot com>
- Date: Thu, 25 Mar 2004 15:46:27 -0800
- Subject: Re: PATCH - [tree-ssa] regrouping of expression tree for single multiply add.
- References: <200403252323.i2PNNifl003692@speedy.slc.redhat.com>
On Mar 25, 2004, at 3:23 PM, email@example.com wrote:
Just watch the main development list -- it's being discussed
No. Try mainline.
And I think there's an excellent argument against this kind of
for the mainline as well, at least for FP types.
What is the argument? If issue is correctness for corner cases, is
additional gcc flag; besides -ffast-math, which need be checked for?
under these threads:
GCC options and floating point correctness
(a + b) + c should be replaced by a + (b + c)
GCC beaten by ICC in stupid trig test
Well, there's an argument against it, all right, but the view that it's
appears to be a minority one. It's clear that quite a few people find
transformations useful. Those of you who want standard-conforming
don't have to use -ffast-math, after all.