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| author | Björn Gustavsson <[email protected]> | 2019-03-05 10:20:33 +0100 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2019-03-06 15:42:43 +0100 |
| commit | 9e18956fcb279d33ae00d82db7382b81bad7dcc2 (patch) | |
| tree | c4070c67896210b06436fd238a3e7468e1f09cb3 /erts/emulator/beam/bs_instrs.tab | |
| parent | 405aca76c4bbc47352788858bf0c0749fb1f730d (diff) | |
| download | otp-9e18956fcb279d33ae00d82db7382b81bad7dcc2.tar.gz otp-9e18956fcb279d33ae00d82db7382b81bad7dcc2.tar.bz2 otp-9e18956fcb279d33ae00d82db7382b81bad7dcc2.zip | |
Optimize multiplication in binary matching instructions
Diffstat (limited to 'erts/emulator/beam/bs_instrs.tab')
| -rw-r--r-- | erts/emulator/beam/bs_instrs.tab | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/erts/emulator/beam/bs_instrs.tab b/erts/emulator/beam/bs_instrs.tab index 10f43cd786..493ec10222 100644 --- a/erts/emulator/beam/bs_instrs.tab +++ b/erts/emulator/beam/bs_instrs.tab @@ -23,10 +23,17 @@ BS_SAFE_MUL(A, B, Fail, Dst) { Uint a = $A; Uint b = $B; - Uint res = a * b; + Uint res; +#ifdef HAVE_OVERFLOW_CHECK_BUILTINS + if (__builtin_mul_overflow(a, b, &res)) { + $Fail; + } +#else + res = a * b; if (res / b != a) { $Fail; } +#endif $Dst = res; } |