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| author | Andrew MacLeod <amacleod@redhat.com> | 2021-06-22 17:46:05 -0400 |
|---|---|---|
| committer | Andrew MacLeod <amacleod@redhat.com> | 2021-06-23 10:26:16 -0400 |
| commit | a03e944e92ee51ae583382079d4739b64bd93b35 (patch) | |
| tree | d7417f185d91fb313a96f544561e4036822077c0 /gcc | |
| parent | ca4d381662c37733b2a1d49d6c8f5fcfc1348f3d (diff) | |
| download | gcc-a03e944e92ee51ae583382079d4739b64bd93b35.zip gcc-a03e944e92ee51ae583382079d4739b64bd93b35.tar.gz gcc-a03e944e92ee51ae583382079d4739b64bd93b35.tar.bz2 | |
Do not continue propagating values which cannot be set properly.
If the on-entry cache cannot properly represent a range, do not continue
trying to propagate it.
PR tree-optimization/101148
PR tree-optimization/101014
* gimple-range-cache.cc (ranger_cache::ranger_cache): Adjust.
(ranger_cache::~ranger_cache): Adjust.
(ranger_cache::block_range): Check if propagation disallowed.
(ranger_cache::propagate_cache): Disallow propagation if new value
can't be stored properly.
* gimple-range-cache.h (ranger_cache::m_propfail): New member.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/gimple-range-cache.cc | 11 | ||||
| -rw-r--r-- | gcc/gimple-range-cache.h | 1 |
2 files changed, 11 insertions, 1 deletions
diff --git a/gcc/gimple-range-cache.cc b/gcc/gimple-range-cache.cc index bdecd21..a377261 100644 --- a/gcc/gimple-range-cache.cc +++ b/gcc/gimple-range-cache.cc @@ -731,10 +731,12 @@ ranger_cache::ranger_cache () if (bb) m_gori.exports (bb); } + m_propfail = BITMAP_ALLOC (NULL); } ranger_cache::~ranger_cache () { + BITMAP_FREE (m_propfail); if (m_oracle) delete m_oracle; delete m_temporal; @@ -990,7 +992,9 @@ ranger_cache::block_range (irange &r, basic_block bb, tree name, bool calc) void ranger_cache::add_to_update (basic_block bb) { - if (!m_update_list.contains (bb)) + // If propagation has failed for BB, or its already in the list, don't + // add it again. + if (!bitmap_bit_p (m_propfail, bb->index) && !m_update_list.contains (bb)) m_update_list.quick_push (bb); } @@ -1007,6 +1011,7 @@ ranger_cache::propagate_cache (tree name) int_range_max current_range; int_range_max e_range; + gcc_checking_assert (bitmap_empty_p (m_propfail)); // Process each block by seeing if its calculated range on entry is // the same as its cached value. If there is a difference, update // the cache to reflect the new value, and check to see if any @@ -1063,6 +1068,9 @@ ranger_cache::propagate_cache (tree name) if (new_range != current_range) { bool ok_p = m_on_entry.set_bb_range (name, bb, new_range); + // If the cache couldn't set the value, mark it as failed. + if (!ok_p) + bitmap_set_bit (m_propfail, bb->index); if (DEBUG_RANGE_CACHE) { if (!ok_p) @@ -1092,6 +1100,7 @@ ranger_cache::propagate_cache (tree name) print_generic_expr (dump_file, name, TDF_SLIM); fprintf (dump_file, "\n"); } + bitmap_clear (m_propfail); } // Check to see if an update to the value for NAME in BB has any effect diff --git a/gcc/gimple-range-cache.h b/gcc/gimple-range-cache.h index 1d2e1b9..ecf63dc 100644 --- a/gcc/gimple-range-cache.h +++ b/gcc/gimple-range-cache.h @@ -121,6 +121,7 @@ private: void propagate_updated_value (tree name, basic_block bb); + bitmap m_propfail; vec<basic_block> m_workback; vec<basic_block> m_update_list; }; |