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Re: [PATCH] [3.2 branch] Fix PR optimization/9279
- From: David Edelsohn <dje at watson dot ibm dot com>
- To: Eric Botcazou <ebotcazou at libertysurf dot fr>, Gabriel Dos Reis <gdr at integrable-solutions dot net>
- Cc: Christian Ehrhardt <ehrhardt at mathematik dot uni-ulm dot de>, Roger Sayle <roger at eyesopen dot com>, gcc-patches at gcc dot gnu dot org
- Date: Sun, 26 Jan 2003 22:15:05 -0500
- Subject: Re: [PATCH] [3.2 branch] Fix PR optimization/9279
- References: <200301251528.37831.ebotcazou@libertysurf.fr>
2002-07-10 Roger Sayle <roger@eyesopen.com>
PR c/2454
* combine.c (nonzero_bits): LOAD_EXTEND_OP should only apply
to SUBREGs of MEMs. (num_sign_bit_copies): Likewise.
Doesn't this patch now introduce a performance regression for targets that
don't expose a zero-extend in RTL for sub-word loads from memory?
David