diff options
| author | Martin Liska <mliska@suse.cz> | 2016-09-06 16:13:21 +0200 |
|---|---|---|
| committer | Martin Liska <marxin@gcc.gnu.org> | 2016-09-06 14:13:21 +0000 |
| commit | 7fe76f6ae806fda9a5efe335ccf0e250dd4dde1a (patch) | |
| tree | 315ef19a1505b76db80cb9f8f37a31a21332de73 /gcc/tree-profile.c | |
| parent | 209b636eddd6602c55b4a65237578953b7d80225 (diff) | |
| download | gcc-7fe76f6ae806fda9a5efe335ccf0e250dd4dde1a.zip gcc-7fe76f6ae806fda9a5efe335ccf0e250dd4dde1a.tar.gz gcc-7fe76f6ae806fda9a5efe335ccf0e250dd4dde1a.tar.bz2 | |
Detect whether target can use -fprofile-update=atomic
PR gcov-profile/77378
PR gcov-profile/77466
* libgcov-profiler.c: Use __GCC_HAVE_SYNC_COMPARE_AND_SWAP_{4,8} to
conditionaly enable/disable *_atomic functions.
PR gcov-profile/77378
PR gcov-profile/77466
* tree-profile.c (tree_profiling): Detect whether target can use
-fprofile-update=atomic.
PR gcov-profile/77378
PR gcov-profile/77466
* gcc.dg/profile-update-warning.c: New test.
From-SVN: r240008
Diffstat (limited to 'gcc/tree-profile.c')
| -rw-r--r-- | gcc/tree-profile.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/gcc/tree-profile.c b/gcc/tree-profile.c index 622869e..69b48e5 100644 --- a/gcc/tree-profile.c +++ b/gcc/tree-profile.c @@ -528,6 +528,20 @@ gimple_gen_ior_profiler (histogram_value value, unsigned tag, unsigned base) gsi_insert_before (&gsi, call, GSI_NEW_STMT); } +#ifndef HAVE_sync_compare_and_swapsi +#define HAVE_sync_compare_and_swapsi 0 +#endif +#ifndef HAVE_atomic_compare_and_swapsi +#define HAVE_atomic_compare_and_swapsi 0 +#endif + +#ifndef HAVE_sync_compare_and_swapdi +#define HAVE_sync_compare_and_swapdi 0 +#endif +#ifndef HAVE_atomic_compare_and_swapdi +#define HAVE_atomic_compare_and_swapdi 0 +#endif + /* Profile all functions in the callgraph. */ static unsigned int @@ -535,6 +549,27 @@ tree_profiling (void) { struct cgraph_node *node; + /* Verify whether we can utilize atomic update operations. */ + if (flag_profile_update == PROFILE_UPDATE_ATOMIC) + { + bool can_support = false; + unsigned HOST_WIDE_INT gcov_type_size + = tree_to_uhwi (TYPE_SIZE_UNIT (get_gcov_type ())); + if (gcov_type_size == 4) + can_support + = HAVE_sync_compare_and_swapsi || HAVE_atomic_compare_and_swapsi; + else if (gcov_type_size == 8) + can_support + = HAVE_sync_compare_and_swapdi || HAVE_atomic_compare_and_swapdi; + + if (!can_support) + { + warning (0, "target does not support atomic profile update, " + "single mode is selected"); + flag_profile_update = PROFILE_UPDATE_SINGLE; + } + } + /* This is a small-ipa pass that gets called only once, from cgraphunit.c:ipa_passes(). */ gcc_assert (symtab->state == IPA_SSA); |