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75444d97
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2019-01-20T13:52:46
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add with overflow: correct documentation
Correct the documentation on the fallback add/multiply with overflow
functions.
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abbc07f1
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2019-01-20T13:51:15
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add with overflow: use SizeTAdd on Windows
Windows provides <intsafe.h> which provides "performant" add and
multiply with overflow operations. Use them when possible.
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c6d47acf
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2019-01-20T13:04:10
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Remove unused git__add_uint64_overflow
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f04f1c7e
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2019-01-20T13:00:53
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add with overflow intrinsics: simplify tests
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.
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2848923a
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2019-01-08T17:32:23
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Let GCC use the add/mul overflow intrinsics
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.
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728101e3
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2019-01-08T17:35:16
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Move the intrinsics part of the change to its own PR
Less controversial changes together is better.
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b5e8272f
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2019-01-06T08:29:56
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Attempt at fixing the MingW64 compilation
It seems like MingW64's size_t is defined differently than in Linux.
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7b453e7e
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2019-01-05T22:12:48
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Fix a bunch of warnings
This change fixes a bunch of warnings that were discovered by compiling
with `clang -target=i386-pc-linux-gnu`. It turned out that the
intrinsics were not necessarily being used in all platforms! Especially
in GCC, since it does not support __has_builtin.
Some more warnings were gleaned from the Windows build, but I stopped
when I saw that some third-party dependencies (e.g. zlib) have warnings
of their own, so we might never be able to enable -Werror there.
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abb04caa
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2018-02-01T15:55:48
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consistent header guards
use consistent names for the #include / #define header guard pattern.
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a0d38479
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2017-01-22T01:42:45
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mac: on 32 bit, use `__builtin_umull_overflow`
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c92987d1
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2015-02-20T10:21:32
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Fix MAX 32 bit build problem described in libgit2/libgit2#2917
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16942c6f
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2015-02-12T17:36:48
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integer overflow: use compiler intrinsics if supported
gcc and clang support __builtin_add_overflow, use it whenever
possible, falling back to our naive routines.
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f1453c59
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2015-02-12T12:19:37
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Make our overflow check look more like gcc/clang's
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.
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190b76a6
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2015-02-11T14:52:08
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Introduce git__add_sizet_overflow and friends
Add some helper functions to check for overflow in a type-specific
manner.
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