diff options
Diffstat (limited to 'gcc/unroll.c')
| -rw-r--r-- | gcc/unroll.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/gcc/unroll.c b/gcc/unroll.c index 36e6c57b9f8..51a469dcb48 100644 --- a/gcc/unroll.c +++ b/gcc/unroll.c @@ -2495,6 +2495,7 @@ iteration_info (loop, iteration_var, initial_value, increment) { HOST_WIDE_INT offset = 0; struct induction *v = REG_IV_INFO (REGNO (iteration_var)); + rtx biv_initial_value; if (REGNO (v->src_reg) >= max_reg_before_loop) abort (); @@ -2527,11 +2528,13 @@ iteration_info (loop, iteration_var, initial_value, increment) fprintf (loop_dump_stream, "Loop unrolling: Giv iterator, initial value bias %ld.\n", (long) offset); + /* Initial value is mult_val times the biv's initial value plus add_val. Only useful if it is a constant. */ + biv_initial_value = extend_value_for_giv (v, bl->initial_value); *initial_value = fold_rtx_mult_add (v->mult_val, - plus_constant (bl->initial_value, offset), + plus_constant (biv_initial_value, offset), v->add_val, v->mode); } else @@ -2895,6 +2898,7 @@ find_splittable_givs (loop, bl, unroll_type, increment, unroll_number) loop->start); biv_initial_value = tem; } + biv_initial_value = extend_value_for_giv (v, biv_initial_value); value = fold_rtx_mult_add (v->mult_val, biv_initial_value, v->add_val, v->mode); } @@ -3456,10 +3460,11 @@ final_giv_value (loop, v) insert_before = NEXT_INSN (loop_end); /* Put the final biv value in tem. */ - tem = gen_reg_rtx (bl->biv->mode); + tem = gen_reg_rtx (v->mode); record_base_value (REGNO (tem), bl->biv->add_val, 0); emit_iv_add_mult (increment, GEN_INT (n_iterations), - bl->initial_value, tem, insert_before); + extend_value_for_giv (v, bl->initial_value), + tem, insert_before); /* Subtract off extra increments as we find them. */ for (insn = NEXT_INSN (v->insn); insn != loop_end; |