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| author | Victor Stinner <victor.stinner@gmail.com> | 2015-10-09 20:50:36 (GMT) |
|---|---|---|
| committer | Victor Stinner <victor.stinner@gmail.com> | 2015-10-09 20:50:36 (GMT) |
| commit | 0cdad1e2bc8794cdbba8a89e2a4177a7dedec313 (patch) | |
| tree | 266a4271792dc69aa5ab9e5194f4e10cd06225e1 /Objects/bytesobject.c | |
| parent | be75b8cf2310e0be0f32590a1c0df919058002e8 (diff) | |
| download | cpython-0cdad1e2bc8794cdbba8a89e2a4177a7dedec313.zip cpython-0cdad1e2bc8794cdbba8a89e2a4177a7dedec313.tar.gz cpython-0cdad1e2bc8794cdbba8a89e2a4177a7dedec313.tar.bz2 | |
Issue #25349: Add fast path for b'%c' % int
Optimize also %% formater.
Diffstat (limited to 'Objects/bytesobject.c')
| -rw-r--r-- | Objects/bytesobject.c | 25 |
1 files changed, 15 insertions, 10 deletions
diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c index fd46048..a75c54d 100644 --- a/Objects/bytesobject.c +++ b/Objects/bytesobject.c @@ -808,9 +808,8 @@ _PyBytes_Format(PyObject *format, PyObject *args) fill = ' '; switch (c) { case '%': - pbuf = "%"; - len = 1; - break; + *res++ = '%'; + continue; case 'r': // %r is only for 2/3 code; 3 only code should use %a @@ -842,9 +841,9 @@ _PyBytes_Format(PyObject *format, PyObject *args) case 'x': case 'X': if (PyLong_CheckExact(v) - && width == -1 && prec == -1 - && !(flags & (F_SIGN | F_BLANK)) - && c != 'X') + && width == -1 && prec == -1 + && !(flags & (F_SIGN | F_BLANK)) + && c != 'X') { /* Fast path */ int alternate = flags & F_ALT; @@ -869,7 +868,7 @@ _PyBytes_Format(PyObject *format, PyObject *args) } /* Fast path */ - writer.min_size -= 2; /* size preallocated by "%d" */ + writer.min_size -= 2; /* size preallocated for "%d" */ res = _PyLong_FormatBytesWriter(&writer, res, v, base, alternate); if (res == NULL) @@ -898,7 +897,7 @@ _PyBytes_Format(PyObject *format, PyObject *args) && !(flags & (F_SIGN | F_BLANK))) { /* Fast path */ - writer.min_size -= 2; /* size preallocated by "%f" */ + writer.min_size -= 2; /* size preallocated for "%f" */ res = formatfloat(v, flags, prec, c, NULL, &writer, res); if (res == NULL) goto error; @@ -919,6 +918,11 @@ _PyBytes_Format(PyObject *format, PyObject *args) len = byte_converter(v, &onechar); if (!len) goto error; + if (width == -1) { + /* Fast path */ + *res++ = onechar; + continue; + } break; default: @@ -949,8 +953,9 @@ _PyBytes_Format(PyObject *format, PyObject *args) alloc = width; if (sign != 0 && len == width) alloc++; - if (alloc > 1) { - res = _PyBytesWriter_Prepare(&writer, res, alloc - 1); + /* 2: size preallocated for %s */ + if (alloc > 2) { + res = _PyBytesWriter_Prepare(&writer, res, alloc - 2); if (res == NULL) goto error; } |