assembly « float « C Data Type Q&A

1. What is the fastest way to convert float to int on x86    stackoverflow.com

What is the fastest way you know to convert a floating-point number to an int on an x86 CPU. Preferrably in C or assembly (that can be in-lined in C) ...

2. What's the most efficient way to multiply 4 floats by 4 floats using SSE?    stackoverflow.com

I currently have the following code:

float a[4] = { 10, 20, 30, 40 };
float b[4] = { 0.1, 0.1, 0.1, 0.1 };
asm volatile("movups (%0), %%xmm0\n\t"
       ...

3. Intel Vs. AT&T syntax when addressing xmm and floating instruction    stackoverflow.com

Hello everyone I am working on writing an assembly program and I would like to acquire some knowledge before I start on the looks of AT&T and Intel syntax when addressing xmm ...

4. Do I get a performance penalty when mixing SSE integer/float SIMD instructions    stackoverflow.com

I've used x86 SIMD instructions (SSE1234) in the form of intrinsics quite a lot lately. What I found frustrating is that the SSE ISA has several simple instructions that are available ...

5. GCC inline assembly - Move float to XMM0 before call    stackoverflow.com

I'm currently trying to call a generic C function from GCC inline assembly (bad idea, I know, but I'm bored today...). My operating system is Mac OS X, 64bits, so the calling ...