On 2 April 2018 at 14:00, via cfe-users <cfe-users@lists.llvm.org> wrote:
> > > Date: Sat, 31 Mar 2018 23:51:22 -0400 > > From: Jeffrey Walton via cfe-users <cfe-users@lists.llvm.org> > > To: "CFE-Users (Clang)" <cfe-users@lists.llvm.org> > > Subject: [cfe-users] Problems with hexadecimal constant, > > _mm_set_epi64x and sign conversion > > Message-ID: > > <cah8yc8k8dlaranj9z9ghndjx-dctafwhqz4gyt42daymbub...@mail.gmail.com> > > 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? > A hex value is unsigned by definition, so attaching "LL" to the end won't work. The prototype of _mm_add_epi32 (a.o.) has the ints as signed. So, the answer is to just c-cast the hex values to long long (AFAICS), or suppress the warning. degski
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