gcc/ChangeLog:
2018-06-07 Martin Liska
* tree-switch-conversion.c (jump_table_cluster::can_be_handled):
Change default ratio from 10 to 8.
---
gcc/tree-switch-conversion.c | 10 ++
1 file changed, 2 insertions(+), 8 deletions(-)
diff --git a/gcc/tree-switch-conversion.c b/gcc/tree-switch-conversion.c
index 60181542bcc..5573f50d59f 100644
--- a/gcc/tree-switch-conversion.c
+++ b/gcc/tree-switch-conversion.c
@@ -1075,17 +1075,11 @@ jump_table_cluster::can_be_handled (const vec &clusters,
make a sequence of conditional branches instead of a dispatch.
The definition of "much bigger" depends on whether we are
- optimizing for size or for speed. If the former, the maximum
- ratio range/count = 3, because this was found to be the optimal
- ratio for size on i686-pc-linux-gnu, see PR11823. The ratio
- 10 is much older, and was probably selected after an extensive
- benchmarking investigation on numerous platforms. Or maybe it
- just made sense to someone at some point in the history of GCC,
- who knows... */
+ optimizing for size or for speed. */
if (!flag_jump_tables)
return false;
- unsigned HOST_WIDE_INT max_ratio = optimize_insn_for_size_p () ? 3 : 10;
+ unsigned HOST_WIDE_INT max_ratio = optimize_insn_for_size_p () ? 3 : 8;
unsigned HOST_WIDE_INT range = get_range (clusters[start]->get_low (),
clusters[end]->get_high ());
