PR middle-end/21709

[pf3gnuchains/gcc-fork.git] / gcc / fold-const.c

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 050d45c..0d5f4eb 100644 (file)
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -1600,33 +1600,36 @@ const_binop (enum tree_code code, tree arg1, tree arg2, int notrunc)
 
        case RDIV_EXPR:
          {
+           tree t1, t2, real, imag;
            tree magsquared
              = const_binop (PLUS_EXPR,
                             const_binop (MULT_EXPR, r2, r2, notrunc),
                             const_binop (MULT_EXPR, i2, i2, notrunc),
                             notrunc);
 
-           t = build_complex (type,
-                              const_binop
-                              (INTEGRAL_TYPE_P (TREE_TYPE (r1))
-                               ? TRUNC_DIV_EXPR : RDIV_EXPR,
-                               const_binop (PLUS_EXPR,
-                                            const_binop (MULT_EXPR, r1, r2,
-                                                         notrunc),
-                                            const_binop (MULT_EXPR, i1, i2,
-                                                         notrunc),
-                                            notrunc),
-                               magsquared, notrunc),
-                              const_binop
-                              (INTEGRAL_TYPE_P (TREE_TYPE (r1))
-                               ? TRUNC_DIV_EXPR : RDIV_EXPR,
-                               const_binop (MINUS_EXPR,
-                                            const_binop (MULT_EXPR, i1, r2,
-                                                         notrunc),
-                                            const_binop (MULT_EXPR, r1, i2,
-                                                         notrunc),
-                                            notrunc),
-                               magsquared, notrunc));
+           t1 = const_binop (PLUS_EXPR,
+                             const_binop (MULT_EXPR, r1, r2, notrunc),
+                             const_binop (MULT_EXPR, i1, i2, notrunc),
+                             notrunc);
+           t2 = const_binop (MINUS_EXPR,
+                             const_binop (MULT_EXPR, i1, r2, notrunc),
+                             const_binop (MULT_EXPR, r1, i2, notrunc),
+                             notrunc);
+
+           if (INTEGRAL_TYPE_P (TREE_TYPE (r1)))
+             {
+               real = const_binop (TRUNC_DIV_EXPR, t1, magsquared, notrunc);
+               imag = const_binop (TRUNC_DIV_EXPR, t2, magsquared, notrunc);
+             }
+           else
+             {
+               real = const_binop (RDIV_EXPR, t1, magsquared, notrunc);
+               imag = const_binop (RDIV_EXPR, t2, magsquared, notrunc);
+               if (!real || !imag)
+                 return NULL_TREE;
+             }
+
+           t = build_complex (type, real, imag);
          }
          break;