http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59343
chrbr at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2013-12-3
CC| |olegendo at gcc dot gnu.org
--- Comment #5 from chrbr at gcc dot gnu.org ---
seems a wrong T-bit optimization.
we have
.L3:
tst r1,r1
bt
replaced by
.L3:
bf .L4
although the r1 value can have defs reached from several path.
This has been fixed by Oleg in the 4.9 with a new cflow pass. In 4.8 I think
it's best to just disable it as unsafe, The following workaround is enough to
to fix the problem:
Index: sh.md
===================================================================
--- sh.md (revision 205585)
+++ sh.md (working copy)
@@ -8380,7 +8380,7 @@ label:
{
return output_branch (sh_eval_treg_value (operands[1]), insn, operands);
}
- "&& 1"
+ "&& 0"
[(set (pc) (if_then_else (eq (reg:SI T_REG) (match_dup 2))
(label_ref (match_dup 0))
(pc)))]
do you agree Oleg ?
