From a98aede37772797b4471e1a094452051edff5862 Mon Sep 17 00:00:00 2001 From: Mike Pall Date: Wed, 13 Mar 2013 22:44:01 +0100 Subject: FFI: Add 64 bit bitwise operations. --- doc/ext_ffi_semantics.html | 17 ++++++++++++++++- doc/extensions.html | 3 +++ 2 files changed, 19 insertions(+), 1 deletion(-) (limited to 'doc') diff --git a/doc/ext_ffi_semantics.html b/doc/ext_ffi_semantics.html index 03229012..15c9a6db 100644 --- a/doc/ext_ffi_semantics.html +++ b/doc/ext_ffi_semantics.html @@ -730,6 +730,22 @@ You'll have to explicitly convert a 64 bit integer to a Lua number (e.g. for regular floating-point calculations) with tonumber(). But note this may incur a precision loss. +
  • 64 bit bitwise operations: the rules for 64 bit +arithmetic operators apply analogously.
    + +Unlike the other bit.* operations, bit.tobit() +converts a cdata number via int64_t to int32_t and +returns a Lua number.
    + +For bit.band(), bit.bor() and bit.bxor(), the +conversion to int64_t or uint64_t applies to +all arguments, if any argument is a cdata number.
    + +For all other operations, only the first argument is used to determine +the output type. This implies that a cdata number as a shift count for +shifts and rotates is accepted, but that alone does not cause +a cdata number output. +

    Comparisons of cdata objects

    @@ -1222,7 +1238,6 @@ value.
    • Other missing features: