What version of Clang are you using? I cannot tell from the Travis config. I
cannot reproduce this with -Wall -Wextra with any of the Clangs I happen to
have on hand (3.8.0, 4.0.1, 5.0.0).
> On 1 Apr 2018, at 12:00, via cfe-users wrote:
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> Today's Topics:
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> 1. Problems with hexadecimal constant,_mm_set_epi64x and sign
> conversion (Jeffrey Walton via cfe-users)
>
>
> --
>
> Message: 1
> Date: Sat, 31 Mar 2018 23:51:22 -0400
> From: Jeffrey Walton via cfe-users
> To: "CFE-Users (Clang)"
> Subject: [cfe-users] Problems with hexadecimal constant,
>_mm_set_epi64x and sign conversion
> Message-ID:
>
> Content-Type: text/plain; charset="UTF-8"
>
> I'm having trouble with Travis during testing. The failed test is
> available at https://travis-ci.org/Tarsnap/scrypt/jobs/360781179.
>
> Clang has rejected my attempts to use the constant (no suffix, ULL and LL):
>
> MSG = _mm_add_epi32(MSG0, _mm_set_epi64x(0xE9B5DBA5B5C0FBCF,
> 0x71374491428A2F98));
>
> MSG = _mm_add_epi32(MSG0, _mm_set_epi64x(0xE9B5DBA5B5C0FBCFULL,
> 0x71374491428A2F98ULL));
>
> MSG = _mm_add_epi32(MSG0, _mm_set_epi64x(0xE9B5DBA5B5C0FBCFLL,
> 0x71374491428A2F98LL));
>
> The message the compiler provides is:
>
> crypto_sha256_shani.c:50:44: error: implicit conversion changes
> signedness: 'unsigned long' to 'long long' [-Werror,-Wsign-conversion]
>
> The code came from Intel and I doubt it is defective.
>
> How do I trick Clang to accept the hexadecimal value?
>
> Thanks in advance.
>
>
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