How to deal with inline asm functions in Phobos/druntime?

Daniel Murphy via digitalmars-d-ldc digitalmars-d-ldc at
Wed Apr 8 06:15:25 PDT 2015

"Johan Engelen"  wrote in message 
news:hqpjetsgaeoqkfyqexka at

> About SSE: I can't vectorize the code for this one function with one real 
> as argument! I had done a brief search for what instructions are available 
> on xmm regs (argument is passed through xmm0), but it is mostly simple 
> arithmetic I think, not the kind of stuff that is used in the original 
> druntime asm code.
> (Btw, the pro-epilogues also consist of pushing/popping all XMM regs, 
> quite a bit of data, but indeed no clue how slow/fast that is. Didn't 
> measure a thing, but it just looked kind of wasteful :)

I don't think it's so much about vectorizing as it is about avoiding the x87 
FPU, which you can do when 80-bit precision is not needed. 

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