Steve Dower <steve.do...@python.org> added the comment:
While you're testing patches, can you try this version too?
Py_UCS4 c = 0, minc = 0x20;
for (next = end; next < len; next++) {
c = PyUnicode_READ(kind, buf, next);
if (c == '"' || c == '\\') {
break;
}
minc = c < minc ? c : minc;
}
if (strict && minc <= 0x1f) {
raise_errmsg("Invalid control character at", pystr, next);
goto bail;
}
When we tried this, the conditional expression became a "cmovl" operator which
removed 3-4 branches from within the loop entirely, and it was 18% better than
the baseline (which has now moved...)
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<https://bugs.python.org/issue37587>
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