When compiling an optabs.ii at -O2 with a release-checking build,
there were 6,643,575 calls to gimple_outgoing_range_stmt_p. 96.8% of
them were for blocks with a single successor, which never have a control
statement that generates new range info. This patch therefore adds a
shortcut for that case.
This gives a ~1% compile-time improvement for the test.
I tried making the function inline (in the header) so that the
single_succ_p didn't need to be repeated, but it seemed to make things
slightly worse.
gcc/
* gimple-range-edge.cc (gimple_outgoing_range::edge_range_p): Add
a shortcut for blocks with single successors.
* gimple-range-gori.cc (gori_map::calculate_gori): Likewise.
gimple *
gimple_outgoing_range::edge_range_p (irange &r, edge e)
{
+ if (single_succ_p (e->src))
+ return NULL;
+
// Determine if there is an outgoing edge.
gimple *s = gimple_outgoing_range_stmt_p (e->src);
if (!s)
m_outgoing[bb->index] = BITMAP_ALLOC (&m_bitmaps);
m_incoming[bb->index] = BITMAP_ALLOC (&m_bitmaps);
+ if (single_succ_p (bb))
+ return;
+
// If this block's last statement may generate range informaiton, go
// calculate it.
gimple *stmt = gimple_outgoing_range_stmt_p (bb);