diff options
Diffstat (limited to 'gcc/tree-switch-conversion.c')
| -rw-r--r-- | gcc/tree-switch-conversion.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/gcc/tree-switch-conversion.c b/gcc/tree-switch-conversion.c index 34f4db0708e..aadf9c1b1dd 100644 --- a/gcc/tree-switch-conversion.c +++ b/gcc/tree-switch-conversion.c @@ -130,21 +130,18 @@ hoist_edge_and_branch_if_true (gimple_stmt_iterator *gsip, This function (and similar RTL-related cost code in e.g. IVOPTS) should be moved to some kind of interface file for GIMPLE/RTL interactions. */ static bool -lshift_cheap_p (void) +lshift_cheap_p (bool speed_p) { /* FIXME: This should be made target dependent via this "this_target" mechanism, similar to e.g. can_copy_init_p in gcse.c. */ static bool init[2] = {false, false}; static bool cheap[2] = {true, true}; - bool speed_p; /* If the targer has no lshift in word_mode, the operation will most probably not be cheap. ??? Does GCC even work for such targets? */ if (optab_handler (ashl_optab, word_mode) == CODE_FOR_nothing) return false; - speed_p = optimize_insn_for_speed_p (); - if (!init[speed_p]) { rtx reg = gen_raw_REG (word_mode, 10000); @@ -165,12 +162,12 @@ lshift_cheap_p (void) static bool expand_switch_using_bit_tests_p (tree range, unsigned int uniq, - unsigned int count) + unsigned int count, bool speed_p) { return (((uniq == 1 && count >= 3) || (uniq == 2 && count >= 5) || (uniq == 3 && count >= 6)) - && lshift_cheap_p () + && lshift_cheap_p (speed_p) && compare_tree_int (range, GET_MODE_BITSIZE (word_mode)) < 0 && compare_tree_int (range, 0) > 0); } @@ -1363,7 +1360,9 @@ process_switch (gimple swtch) if (info.uniq <= MAX_CASE_BIT_TESTS) { if (expand_switch_using_bit_tests_p (info.range_size, - info.uniq, info.count)) + info.uniq, info.count, + optimize_bb_for_speed_p + (gimple_bb (swtch)))) { if (dump_file) fputs (" expanding as bit test is preferable\n", dump_file); |