delta/libgit2.git/src/integer.h, branch ethomson/object_size

add with overflow: correct documentation

2019-01-20T13:52:46+00:00

Correct the documentation on the fallback add/multiply with overflow
functions.

add with overflow: use SizeTAdd on Windows

2019-01-20T13:51:15+00:00

Windows provides  which provides "performant" add and
multiply with overflow operations.  Use them when possible.

Remove unused git__add_uint64_overflow

2019-01-20T13:04:10+00:00

add with overflow intrinsics: simplify tests

2019-01-20T13:00:53+00:00

Use the smallest unsigned type that is equivalent to `size_t` to
simplify the conditionals.  Error if we're on a system that we believe
offers builtins but we cannot determine which one to use.

Let GCC use the add/mul overflow intrinsics

2019-01-10T00:51:03+00:00

This change tweaks the macros for git__{add,multiply}_sizet_overflow so
that GCC can use them.

It also stops using the uadd,umul versions since the add,mul can handle
way more cases.

consistent header guards

2018-02-01T23:56:33+00:00

use consistent names for the #include / #define header guard pattern.

mac: on 32 bit, use `__builtin_umull_overflow`

2017-01-23T22:29:58+00:00

Fix MAX 32 bit build problem described in libgit2/libgit2#2917

2015-02-20T17:59:43+00:00

integer overflow: use compiler intrinsics if supported

2015-02-13T14:28:09+00:00

gcc and clang support __builtin_add_overflow, use it whenever
possible, falling back to our naive routines.

Make our overflow check look more like gcc/clang's

2015-02-13T14:27:33+00:00

Make our overflow checking look more like gcc and clang's, so that
we can substitute it out with the compiler instrinsics on platforms
that support it.  This means dropping the ability to pass `NULL` as
an out parameter.

As a result, the macros also get updated to reflect this as well.