(expand_divmod, case CEIL_DIV_EXPR): Handle emit_store_flag returning 0.

From-SVN: r7768

diff --git a/gcc/expmed.c b/gcc/expmed.c
index 5b2d61ef270c6db9344c28a39fcd79bcf589ce5a..e2cba0dc46f8d7b0376e470601cd2ce9c6fbf53f 100644 (file)
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -3132,16 +3132,28 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
                unsigned HOST_WIDE_INT d = INTVAL (op1);
                t1 = expand_shift (RSHIFT_EXPR, compute_mode, op0,
                                   build_int_2 (floor_log2 (d), 0),
-                                  NULL_RTX, 1);
+                                  tquotient, 1);
                t2 = expand_binop (compute_mode, and_optab, op0,
                                   GEN_INT (d - 1),
                                   NULL_RTX, 1, OPTAB_LIB_WIDEN);
                t3 = gen_reg_rtx (compute_mode);
                t3 = emit_store_flag (t3, NE, t2, const0_rtx,
                                      compute_mode, 1, 1);
-               quotient = force_operand (gen_rtx (PLUS, compute_mode,
-                                                  t1, t3),
-                                         tquotient);
+               if (t3 == 0)
+                 {
+                   rtx lab;
+                   lab = gen_label_rtx ();
+                   emit_cmp_insn (t2, const0_rtx, EQ, NULL_RTX,
+                                  compute_mode, 0, 0);
+                   emit_jump_insn (gen_beq (lab));
+                   expand_inc (t1, const1_rtx);
+                   emit_label (lab);
+                   quotient = t1;
+                 }
+               else
+                 quotient = force_operand (gen_rtx (PLUS, compute_mode,
+                                                    t1, t3),
+                                           tquotient);
                break;
              }