Hello !

i need speed up for critical time code.
1. how use variables for use altivec register ?
2. how use assembler code for include to GCC C code ?
Is it possible ?

2. I think this is what you want to read about: https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html

You might want to read about AltiVec Intrinsics too, you don't have to use asm.


- CISC

Quote:

Have you tried using -Ofast -maltivec -mabi=altivec as gcc flags?

[ Edited by Intuition 28.01.2019 - 19:56 ]

I doubt that will do much, auto-vectorization in GCC was never really good.

Quote:

It depends on the code, no harm in trying.

-mavx makes a huge difference on some code I've been working with recently that uses a lot of vec3's.

Remember, that Altivec-Data has to be 16 Byte alligned.
And to enable Vectorization of Floating-Point-Reductions add -ffast-math

[ Edited by Tom01 01.02.2019 - 23:00 ]