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| author | Martin Liska <mliska@suse.cz> | 2017-03-03 12:53:56 +0100 |
|---|---|---|
| committer | Martin Liska <marxin@gcc.gnu.org> | 2017-03-03 11:53:56 +0000 |
| commit | d78a1c01dbb859cb406ffdea3bc2ced2963cae9a (patch) | |
| tree | 819e4d40f5b3dd8e071eb7d0b6bab9fc6953394a /gcc/tree-ssa-loop-prefetch.c | |
| parent | ec7f796e87db1b01ce4fbaabc6f0d73000ad4001 (diff) | |
| download | gcc-d78a1c01dbb859cb406ffdea3bc2ced2963cae9a.zip gcc-d78a1c01dbb859cb406ffdea3bc2ced2963cae9a.tar.gz gcc-d78a1c01dbb859cb406ffdea3bc2ced2963cae9a.tar.bz2 | |
Add -Wdisabled-optimization to loop prefetching pass (PR tree-optimization/79803).
2017-03-03 Martin Liska <mliska@suse.cz>
PR tree-optimization/79803
* tree-ssa-loop-prefetch.c (tree_ssa_prefetch_arrays): Remove
assert.
(pass_loop_prefetch::execute): Disabled optimization if an
assumption about L1 cache size is not met.
2017-03-03 Martin Liska <mliska@suse.cz>
PR tree-optimization/79803
* gcc.dg/tree-ssa/pr79803.c: New test.
From-SVN: r245869
Diffstat (limited to 'gcc/tree-ssa-loop-prefetch.c')
| -rw-r--r-- | gcc/tree-ssa-loop-prefetch.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/gcc/tree-ssa-loop-prefetch.c b/gcc/tree-ssa-loop-prefetch.c index 54cd942..a137207 100644 --- a/gcc/tree-ssa-loop-prefetch.c +++ b/gcc/tree-ssa-loop-prefetch.c @@ -47,6 +47,7 @@ along with GCC; see the file COPYING3. If not see #include "langhooks.h" #include "tree-inline.h" #include "tree-data-ref.h" +#include "diagnostic-core.h" /* This pass inserts prefetch instructions to optimize cache usage during accesses to arrays in loops. It processes loops sequentially and: @@ -1977,10 +1978,6 @@ tree_ssa_prefetch_arrays (void) set_builtin_decl (BUILT_IN_PREFETCH, decl, false); } - /* We assume that size of cache line is a power of two, so verify this - here. */ - gcc_assert ((PREFETCH_BLOCK & (PREFETCH_BLOCK - 1)) == 0); - FOR_EACH_LOOP (loop, LI_FROM_INNERMOST) { if (dump_file && (dump_flags & TDF_DETAILS)) @@ -2038,6 +2035,21 @@ pass_loop_prefetch::execute (function *fun) if (number_of_loops (fun) <= 1) return 0; + bool warned_p = false; + if ((PREFETCH_BLOCK & (PREFETCH_BLOCK - 1)) != 0) + { + static bool warned = false; + + if (!warned) + { + warning (OPT_Wdisabled_optimization, + "%<l1-cache-size%> parameter is not a power of two %d", + PREFETCH_BLOCK); + warned = true; + } + return 0; + } + return tree_ssa_prefetch_arrays (); } |