diff options
| author | Douglas Katzman <dougk@google.com> | 2020-02-06 13:35:27 -0500 |
|---|---|---|
| committer | Douglas Katzman <dougk@google.com> | 2020-02-06 13:35:27 -0500 |
| commit | 2ee51799861065b0dab8278cdbb875a0553b37f3 (patch) | |
| tree | b19f54aca2415fc58308b96630613fa0a8cfbe57 /doc | |
| parent | 0bf2b6e9955cfbf2cb7506e6e52c6f26fb0cf93d (diff) | |
Improve doc for CAS on structures
Clarify both the current state and the intent, which is to potentially
support raw slots.
Reviewed by CSR
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/manual/efficiency.texinfo | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/doc/manual/efficiency.texinfo b/doc/manual/efficiency.texinfo index 180672a6d..db69d049f 100644 --- a/doc/manual/efficiency.texinfo +++ b/doc/manual/efficiency.texinfo @@ -168,7 +168,12 @@ call to the constructor is bound to a variable declared @code{dynamic-extent}. @strong{Note}: structures with ``raw'' slots can currently be -stack-allocated only on x86 and x86-64. +stack-allocated only on x86 and x86-64. A ``raw'' slot is one whose +declared type is a subtype of exactly one of: @code{double-float}, +@code{single-float}, @code{(complex double-float)}, @code{(complex single-float)}, +or @code{sb-ext:word}; but as an exception to the preceding, any subtype +of @code{fixnum} is not stored as raw despite also being a subtype +of @code{sb-ext:word}. @item all of the above when they appear as initial parts of another |