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| author | Tom de Vries <tdevries@suse.de> | 2020-09-07 10:47:25 +0200 |
|---|---|---|
| committer | Tom de Vries <tdevries@suse.de> | 2020-09-11 12:06:15 +0200 |
| commit | 15545563128f0240192c263522d4a36b7f86250f (patch) | |
| tree | 746bb4c9e006aa697779062ec38bfd6e35ff6fea /libatomic/libatomic_i.h | |
| parent | 8ae0de5621120b16295fe6b73ca044d4c576af6d (diff) | |
| download | gcc-15545563128f0240192c263522d4a36b7f86250f.zip gcc-15545563128f0240192c263522d4a36b7f86250f.tar.gz gcc-15545563128f0240192c263522d4a36b7f86250f.tar.bz2 | |
[libatomic] Add nvptx support
Add nvptx support to libatomic.
Given that atomic_test_and_set is not implemented for nvptx (PR96964), the
compiler translates __atomic_test_and_set falling back onto the "Failing all
else, assume a single threaded environment and simply perform the operation"
case in expand_atomic_test_and_set, so it doesn't map onto an actual atomic
operation.
Still, that counts as supported for the configure test of libatomic, so we
end up with HAVE_ATOMIC_TAS_1/2/4/8/16 == 1, and the corresponding
__atomic_test_and_set_1/2/4/8/16 in libatomic all using that non-atomic
implementation.
Fix this by adding an atomic_test_and_set expansion for nvptx, that uses
libatomics __atomic_test_and_set_1.
This again makes the configure tests for HAVE_ATOMIC_TAS_1/2/4/8/16 fail, so
instead we use this case in tas_n.c:
...
/* If this type is smaller than word-sized, fall back to a word-sized
compare-and-swap loop. */
bool
SIZE(libat_test_and_set) (UTYPE *mptr, int smodel)
...
which for __atomic_test_and_set_8 uses INVERT_MASK_8.
Add INVERT_MASK_8 in libatomic_i.h, as well as MASK_8.
Tested libatomic testsuite on nvptx.
gcc/ChangeLog:
PR target/96964
* config/nvptx/nvptx.md (define_expand "atomic_test_and_set"): New
expansion.
libatomic/ChangeLog:
PR target/96898
* configure.tgt: Add nvptx.
* libatomic_i.h (MASK_8, INVERT_MASK_8): New macro definition.
* config/nvptx/host-config.h: New file.
* config/nvptx/lock.c: New file.
Diffstat (limited to 'libatomic/libatomic_i.h')
| -rw-r--r-- | libatomic/libatomic_i.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/libatomic/libatomic_i.h b/libatomic/libatomic_i.h index 081b154..37de992 100644 --- a/libatomic/libatomic_i.h +++ b/libatomic/libatomic_i.h @@ -109,9 +109,11 @@ typedef unsigned UWORD __attribute__((mode(word))); #define MASK_1 ((UWORD)0xff) #define MASK_2 ((UWORD)0xffff) #define MASK_4 ((UWORD)0xffffffff) +#define MASK_8 ((UWORD)0xffffffffffffffff) #define INVERT_MASK_1 ((UWORD)WORDS_BIGENDIAN << ((WORDSIZE - 1) * CHAR_BIT)) #define INVERT_MASK_2 ((UWORD)WORDS_BIGENDIAN << ((WORDSIZE - 2) * CHAR_BIT)) #define INVERT_MASK_4 ((UWORD)WORDS_BIGENDIAN << ((WORDSIZE - 4) * CHAR_BIT)) +#define INVERT_MASK_8 ((UWORD)WORDS_BIGENDIAN << ((WORDSIZE - 8) * CHAR_BIT)) /* Most of the files in this library are compiled multiple times with N defined to be a power of 2 between 1 and 16. The SIZE macro is |