[Bug target/11271] [3.4 regression] [arm-elf] regex.c ICEs for thumb multilib

[rearnsha at arm dot com]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11271



------- Additional Comments From rearnsha at arm dot com  2003-07-28 16:46 -------
Subject: Re:  [3.4 regression] [arm-elf] regex.c ICEs 
 for thumb multilib


> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11271

This turns out to be a result of the following patch:

	http://gcc.gnu.org/ml/gcc-patches/2003-03/msg02014.html

+ 2003-03-26  Eric Botcazou  <ebotcazou@libertysurf.fr>
+ 
+       PR target/7784
+       * reload.c (find_reloads_address): Handle
+       (PLUS (PLUS (REG) (REG)) (CONST_INT)) form for
+       all base registers.
+ 

As far as I can determine, this is because of the extra constraint added 
to the test that ensures that the register being reloaded is valid as a 
base register.  Unfortunately, this fails on thumb, since SP is not a 
valid base register for QImode (so a further reload will be needed).  
Prior to this patch we seemed to get things right even without the 
additional test.

Eric, was there a particular reason for adding the test of 
REG_MODE_OK_FOR_BASE_P?

R.