Hi, all,
In nds32 port, there is a wrong design in "casesi_internal" pattern.
Since clobber always discards the previous value, it should have
constraint modifier '=' so that LRA is able to correctly handle the
register live info.
So we have this patch to fix the issue. Committed as Rev.218774.
Index: gcc/ChangeLog
===================================================================
--- gcc/ChangeLog (revision 218773)
+++ gcc/ChangeLog (working copy)
@@ -1,3 +1,9 @@
+2014-12-16 Chung-Ju Wu <jasonw...@gmail.com>
+
+ PR target/64217
+ * config/nds32/nds32.md (casesi_internal): Add '=r' for clobber
+ register constraint.
+
2014-12-15 DJ Delorie <d...@redhat.com>
* config/rl78/rl78.h: Remove SHORT_IMMEDIATES_SIGN_EXTEND.
Index: gcc/config/nds32/nds32.md
===================================================================
--- gcc/config/nds32/nds32.md (revision 218773)
+++ gcc/config/nds32/nds32.md (working copy)
@@ -2178,7 +2178,7 @@
(const_int 4))
(label_ref (match_operand 1 "" "")))))
(use (label_ref (match_dup 1)))
- (clobber (match_operand:SI 2 "register_operand" ""))
+ (clobber (match_operand:SI 2 "register_operand" "=r"))
(clobber (reg:SI TA_REGNUM))])]
""
{
Best regards,
jasonwucj
