OpenE2K/gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Reenable combination of hard regs unless CLASS_LIKELY_SPILLED_P.

Browse Source 
From-SVN: r53531
This commit is contained in:
Dale Johannesen 2002-05-16 21:30:48 +00:00 committed by Dale Johannesen
parent 1020e435ae
commit 63b827c591
2 changed files with 13 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2002-05-16 Dale Johannesen <dalej@apple.com>
* combine.c (cant_combine_insn_p): Reenable combinations
involving hard regs unless CLASS_LIKELY_SPILLED_P.
2002-05-16 Neil Booth <neil@daikokuya.demon.co.uk>
* c-common.c (cb_register_builtins): Handle more built-ins

14
gcc/combine.c
View File

@ -1459,10 +1459,10 @@ cant_combine_insn_p (insn)
if (! INSN_P (insn))
return 1;
/* Never combine loads and stores involving hard regs. The register
allocator can usually handle such reg-reg moves by tying. If we allow
the combiner to make substitutions of hard regs, we risk aborting in
reload on machines that have SMALL_REGISTER_CLASSES.
/* Never combine loads and stores involving hard regs that are likely
to be spilled. The register allocator can usually handle such
reg-reg moves by tying. If we allow the combiner to make
substitutions of likely-spilled regs, we may abort in reload.
As an exception, we allow combinations involving fixed regs; these are
not available to the register allocator so there's no risk involved. */
@ -1477,9 +1477,11 @@ cant_combine_insn_p (insn)
dest = SUBREG_REG (dest);
if (REG_P (src) && REG_P (dest)
&& ((REGNO (src) < FIRST_PSEUDO_REGISTER
&& ! fixed_regs[REGNO (src)])
&& ! fixed_regs[REGNO (src)]
&& CLASS_LIKELY_SPILLED_P (REGNO_REG_CLASS (REGNO (src))))
|| (REGNO (dest) < FIRST_PSEUDO_REGISTER
&& ! fixed_regs[REGNO (dest)])))
&& ! fixed_regs[REGNO (dest)]
&& CLASS_LIKELY_SPILLED_P (REGNO_REG_CLASS (REGNO (dest))))))
return 1;
return 0;