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Sharing vector math routines?
- From: Steve Ellcey <sellcey at marvell dot com>
- To: "libc-alpha at sourceware dot org" <libc-alpha at sourceware dot org>, "tnggil at protonmail dot com" <tnggil at protonmail dot com>
- Date: Fri, 12 Apr 2019 21:35:04 +0000
- Subject: Sharing vector math routines?
I have a question/thought about the libmvec routines that I am working
on for Aarch64 and that Bert Tenjy has been working on for PPC64.
Given that both of us are writing routines in C (vs. Assembly) I was
wondering if we should try to share the code/algorithms being used.
The vector types being used have different names (__Float32x4_t or
float32x4_t or 'vector float') but the names could be put in a macro
and then we could use a shared source file for the implementation.
So we could have a vector sinf like this for Aarch64:
#include <arm_neon.h>
#define VECSIZE 4
#define VECTYPE float32x4_t
#define BASETYPE float
#include "vec_sinf.c"
And for PPC it might be:
#include <altivec.h>
#define VECSIZE 4
#define VECTYPE vector float
#define BASETYPE float
#include "vec_sinf.c"
Then the shared vec_sinf.c could be written using VECSIZE, VECTYPE, and
BASETYPE and shared between these and other platforms.
Steve Ellcey
sellcey@marvell.com