[fpc-devel] Detecting SSE and AVX compiler options

Bart bartjunk64 at gmail.com
Sun Feb 3 12:14:32 CET 2019

On Sun, Feb 3, 2019 at 7:28 AM J. Gareth Moreton
<gareth at moreton-family.com> wrote:

> function floor64(x: float): Int64; assembler; nostackframe;
>   asm
>     roundsd %xmm0, %xmm0, $0b101 { Round towards negative infinity }
>     cvttsd2si %xmm0, %rax { Convert to integer... equivalent to Trunc() }
>   end;

I might be totaly wrong here, but wouldn't that (rounding towards
negative infinity) produce wrong results for negative floating point

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