ffs*, integer_length*: Optimized for MSVC

[Bruno Haible]

In new code, I'm making intensive use of the functions ffs and ffsll, for
searching in a bitset. So, these functions should better be well optimized,
even for MSVC.

And while at it, also the integer_length* functions.


2020-08-03  Bruno Haible  <bruno@clisp.org>

        integer_length_ll: Optimize for MSVC in 64-bit mode.
        * lib/integer_length_l.c (MSVC_BUILTIN): Define for MSVC in 64-bit mode.
        (FUNC): On MSVC, use MSVC_BUILTIN if defined.

2020-08-03  Bruno Haible  <bruno@clisp.org>

        integer_length_ll: Optimize for MSVC in 32-bit mode.
        * lib/integer_length_l.c: Include <intrin.h>.
        (integer_length): Define as inline function, like in
        lib/integer_length.c.

2020-08-03  Bruno Haible  <bruno@clisp.org>

        integer_length: Optimize for MSVC.
        * lib/integer_length.c: Include <intrin.h>.
        (integer_length): With MSVC, use the _BitScanReverse built-in.

2020-08-03  Bruno Haible  <bruno@clisp.org>

        ffsll: Optimize for MSVC in 64-bit mode.
        * lib/ffsl.h (FUNC): On MSVC, use MSVC_BUILTIN if defined.
        * lib/ffsll.c (MSVC_BUILTIN): Define for MSVC in 64-bit mode.
        * lib/ffsl.c (MSVC_BUILTIN): Define for MSVC.

2020-08-03  Bruno Haible  <bruno@clisp.org>

        ffsll: Optimize for MSVC in 32-bit mode.
        * lib/ffsl.h: Include <intrin.h>.
        (ffs): Define as inline function, like in lib/ffs.c.

2020-08-03  Bruno Haible  <bruno@clisp.org>

        ffs: Optimize for MSVC.
        * lib/ffs.c: Include <intrin.h>.
        (ffs): With MSVC, use the _BitScanForward built-in.

0001-ffs-Optimize-for-MSVC.patch
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0002-ffsll-Optimize-for-MSVC-in-32-bit-mode.patch
Description: Text Data

0003-ffsll-Optimize-for-MSVC-in-64-bit-mode.patch
Description: Text Data

0004-integer_length-Optimize-for-MSVC.patch
Description: Text Data

0005-integer_length_ll-Optimize-for-MSVC-in-32-bit-mode.patch
Description: Text Data

0006-integer_length_ll-Optimize-for-MSVC-in-64-bit-mode.patch
Description: Text Data