PR rtl-optimization/27477

[pf3gnuchains/gcc-fork.git] / gcc / combine.c

diff --git a/gcc/combine.c b/gcc/combine.c
index 33512ec..c570ea6 100644 (file)
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -2896,7 +2896,14 @@ try_combine (rtx i3, rtx i2, rtx i1, int *new_direct_jump_p)
           && ! reg_referenced_p (SET_DEST (XVECEXP (newpat, 0, 0)),
                                  XVECEXP (newpat, 0, 1))
           && ! (contains_muldiv (SET_SRC (XVECEXP (newpat, 0, 0)))
-                && contains_muldiv (SET_SRC (XVECEXP (newpat, 0, 1)))))
+                && contains_muldiv (SET_SRC (XVECEXP (newpat, 0, 1))))
+#ifdef HAVE_cc0
+          /* We cannot split the parallel into two sets if both sets
+             reference cc0.  */
+          && ! (reg_referenced_p (cc0_rtx, XVECEXP (newpat, 0, 0))
+                && reg_referenced_p (cc0_rtx, XVECEXP (newpat, 0, 1)))
+#endif
+          )
     {
       /* Normally, it doesn't matter which of the two is done first,
         but it does if one references cc0.  In that case, it has to