(can_combine_p): Don't move an UNSPEC_VOLATILE.

From-SVN: r4085

diff --git a/gcc/combine.c b/gcc/combine.c
index a33bcc1e2930c8f375d13e077d167b844ef3c78c..86f920cf5c5716eee53cd1e410720b74b46e2ab0 100644 (file)
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -825,10 +825,12 @@ can_combine_p (insn, i3, pred, succ, pdest, psrc)
         If the insns are adjacent, a use can't cross a set even though we
         think it might (this can happen for a sequence of insns each setting
         the same destination; reg_last_set of that register might point to
-        a NOTE).  Also, don't move a volatile asm across any other insns.  */
+        a NOTE).  Also, don't move a volatile asm or UNSPEC_VOLATILE across
+        any other insns.  */
       || (! all_adjacent
          && (use_crosses_set_p (src, INSN_CUID (insn))
-             || (GET_CODE (src) == ASM_OPERANDS && MEM_VOLATILE_P (src))))
+             || (GET_CODE (src) == ASM_OPERANDS && MEM_VOLATILE_P (src))
+             || GET_CODE (src) == UNSPEC_VOLATILE))
       /* If there is a REG_NO_CONFLICT note for DEST in I3 or SUCC, we get
         better register allocation by not doing the combine.  */
       || find_reg_note (i3, REG_NO_CONFLICT, dest)