------- Comment #3 from kkojima at gcc dot gnu dot org 2008-12-25 03:38 -------
Here is an another reduced testcase.
struct s
{
char a[512];
int b;
int c;
};
long long
foo (struct s *p, int m, int r)
{
if (r == m)
p->b = 3;
p->c = 1;
return m;
}
I've confirmed that this fails with the trunk compiler too.
The insn scheduling before reload permutes the insns of
the exit basic block like as:
;; ======================================================
;; -- basic block 5 from 18 to 38 -- before reload
;; ======================================================
;; 0--> 18 r166=0x204
:(issue+load_store),nothing,memory
changing bb of uid 55
;; 0--> 55 {r170=r161<<0x1;t=r161<0x0;} :issue,int
changing bb of uid 56
;; 1--> 56 r170=-t :issue,int
changing bb of uid 46
;; 1--> 46 r0=r161 :issue
;; 2--> 19 r168=0x1 :issue,int
changing bb of uid 47
;; 2--> 47 r1=r170 :issue
;; 3--> 20 [r160+r166]=r168
:(issue+load_store),nothing,memory
;; 3--> 38 use r0 :nothing
i.e. insn 46 r0=r161 is placed before insn 20.
Unfortunately insn 20 [r160+r166]=r168 requires r0 because
sh has r0 + reg addressing only. -fno-schedule-insns gets
rid of the error, though I have no idea for the right solution
ATM.
--
kkojima at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Known to fail|4.3.2 |4.3.2 4.4.0
Priority|P3 |P4
Last reconfirmed|0000-00-00 00:00:00 |2008-12-25 03:38:20
date| |
Summary|[4.3 Regression] sh gcc |[4.3/4.4 Regression] sh gcc
|unable to spill register |unable to spill register
|when building ghostscript- |when building ghostscript-
|gpl with -O2 |gpl with -O2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38621
