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SH PIC: (not) disabling function CSE
- To: gcc-patches at gcc dot gnu dot org
- Subject: SH PIC: (not) disabling function CSE
- From: Alexandre Oliva <aoliva at redhat dot com>
- Date: 06 Sep 2000 09:00:39 -0300
- Organization: GCC Team, Red Hat
Function CSE had to be disabled on SH -fPIC because function call
sequences use constants relative to the address of the caller.
However, disabling function cSE is not necessary for non-PIC code, and
this is a highly beneficial optimization for SH code. Here's the
patch. Ok to install?
Index: gcc/ChangeLog
* config/sh/sh.h (OVERRIDE_OPTIONS): Don't disable function
CSE unless generating PIC.
Index: gcc/config/sh/sh.h
===================================================================
RCS file: /cvs/gcc/egcs/gcc/config/sh/sh.h,v
retrieving revision 1.69
diff -u -p -r1.69 sh.h
--- gcc/config/sh/sh.h 2000/09/06 09:20:38 1.69
+++ gcc/config/sh/sh.h 2000/09/06 11:55:01
@@ -266,7 +271,7 @@ do { \
else \
flag_omit_frame_pointer = 0; \
\
- if (! TARGET_PREFERGOT) \
+ if (flag_pic && ! TARGET_PREFERGOT) \
flag_no_function_cse = 1; \
\
/* Never run scheduling before reload, since that can \
--
Alexandre Oliva Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist *Please* write to mailing lists, not to me