diff options
Diffstat (limited to 'erts')
| -rw-r--r-- | erts/emulator/beam/erl_arith.c | 5 | ||||
| -rw-r--r-- | erts/emulator/beam/global.h | 3 | ||||
| -rw-r--r-- | erts/emulator/beam/utils.c | 12 |
3 files changed, 16 insertions, 4 deletions
diff --git a/erts/emulator/beam/erl_arith.c b/erts/emulator/beam/erl_arith.c index 5150a8a507..47d516534f 100644 --- a/erts/emulator/beam/erl_arith.c +++ b/erts/emulator/beam/erl_arith.c @@ -2048,3 +2048,8 @@ Eterm erts_gc_bnot(Process* p, Eterm* reg, Uint live) } return result; } + +/* Needed to remove compiler optimization */ +double erts_get_positive_zero_float() { + return 0.0f; +} diff --git a/erts/emulator/beam/global.h b/erts/emulator/beam/global.h index 40b043d1cc..54fba9274f 100644 --- a/erts/emulator/beam/global.h +++ b/erts/emulator/beam/global.h @@ -867,6 +867,9 @@ void print_process_info(int, void *, Process*); void info(int, void *); void loaded(int, void *); +/* erl_arith.c */ +double erts_get_positive_zero_float(void); + /* config.c */ __decl_noreturn void __noreturn erl_exit(int n, char*, ...); diff --git a/erts/emulator/beam/utils.c b/erts/emulator/beam/utils.c index 8f6335d5dd..51de3528be 100644 --- a/erts/emulator/beam/utils.c +++ b/erts/emulator/beam/utils.c @@ -958,7 +958,8 @@ tail_recur: FloatDef ff; GET_DOUBLE(term, ff); if (ff.fd == 0.0f) { - ff.fd = 0.0f; /* ensure pos. 0.0 */ + /* ensure positive 0.0 */ + ff.fd = erts_get_positive_zero_float(); } hash = hash*FUNNY_NUMBER6 + (ff.fw[0] ^ ff.fw[1]); break; @@ -1477,7 +1478,8 @@ make_hash2(Eterm term) FloatDef ff; GET_DOUBLE(term, ff); if (ff.fd == 0.0f) { - ff.fd = 0.0f; /* ensure pos. 0.0 */ + /* ensure positive 0.0 */ + ff.fd = erts_get_positive_zero_float(); } #if defined(WORDS_BIGENDIAN) || defined(DOUBLE_MIDDLE_ENDIAN) UINT32_HASH_2(ff.fw[0], ff.fw[1], HCONST_12); @@ -1899,7 +1901,8 @@ make_internal_hash(Eterm term) FloatDef ff; GET_DOUBLE(term, ff); if (ff.fd == 0.0f) { - ff.fd = 0.0f; /* ensure pos. 0.0 */ + /* ensure positive 0.0 */ + ff.fd = erts_get_positive_zero_float(); } UINT32_HASH_2(ff.fw[0], ff.fw[1], HCONST_12); goto pop_next; @@ -2087,7 +2090,8 @@ tail_recur: FloatDef ff; GET_DOUBLE(term, ff); if (ff.fd == 0.0f) { - ff.fd = 0.0f; /* ensure pos. 0.0 */ + /* ensure positive 0.0 */ + ff.fd = erts_get_positive_zero_float(); } hash = hash*FUNNY_NUMBER6 + (ff.fw[0] ^ ff.fw[1]); } |