Bug 15008 – floor(float x) and floor(double x) have no FPU implementation

This came up in JPEG decoding performance measurement. https://github.com/lgvz/imageformats/issues/4 Commit here: https://github.com/p0nce/imageformats/commit/dd9a7a21e270da365eef58722557080493b9a86c While the floor() operations in this commit proved useless, I looked at its implementation in Phobos: https://github.com/lgvz/imageformats/issues/4 It appears that floor(float) and floor(double) have a software-emulation of floor while floor(real) use the proper FPU instructions. Why is that? More over, it would be nice to have lfloor/lceil/ltrunc, since floor calls are currently usually accompanied with cast to int.

Wrong link for the floor(float x) implementation: https://github.com/D-Programming-Language/phobos/blob/master/std/math.d#L3937

Not fixing the issue (have an FPU implementation for D_InlineAsm targets), but should make things better. https://github.com/dlang/phobos/pull/5820

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