That may be the wrong question, but let me explain what I’m observing.
With brew’s gcc 15.1.0 on aarch64-apple-darwin24 (I do realize this is not an official GCC release), I’m seeing the following message:
_irregex.c: In function '___H___irregex':
/Users/lucier/programs/gambit/gambit/include/gambit.h:6501:1: warning: PRE disabled: 38820 basic blocks and 164130 registers; increase '--param max-gcse-memory' above 777916 [-Wdisabled-optimization]
6501 | }
| ^
/Users/lucier/programs/gambit/gambit/include/gambit.h:2390:19: note: in definition of macro '___SM'
2390 | #define ___SM(s,m)s
| ^
/Users/lucier/programs/gambit/gambit/include/gambit.h:6462:28: note: in expansion of macro '___END_COD'
6462 | #define ___END_M_COD ___SM(___END_COD,___NOTHING)
| ^~~~~~~~~~
_irregex.c:155937:1: note: in expansion of macro '___END_M_COD'
155937 | ___END_M_COD
| ^~~~~~~~~~~~
This is the largest of a number of routines I’m compiling. max-gcse-memory has already been set to 400000 to silence similar warnings for a few smaller (but still quite large) routines.
With GCC 15.1.0 on x86_64-pc-linux-gnu that I’ve built myself on Ubuntu 24.04, no such warnings appear.
My very limited understanding of PRE is that its behavior should not be architecture dependent, so I’m a bit surprised at these warnings.
Any advice?
Brad
