scottk/OpenCellular
1
0
Fork 0
mirror of https://github.com/Telecominfraproject/OpenCellular.git synced 2026-01-07 16:11:43 +00:00
Code Issues Packages Projects Releases Wiki Activity

common: math: Use float when CONFIG_FPU is set.

Browse Source 
When hardware FPU is set, use it.

BRANCH=smaug
BUG=chrome-os-partner:39900
TEST=compile.

Change-Id: I5b42bd23a7ee7549e538eff075756b58f79756f2
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/299516
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>
This commit is contained in:
Gwendal Grignou
2015-09-09 08:53:55 -07:00
committed by chrome-bot
parent 4ef6aabe07
commit d896a005d4
1 changed files with 27 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
include/math_util.h
View File

@@ -8,6 +8,19 @@
#ifndef __CROS_EC_MATH_UTIL_H
#define __CROS_EC_MATH_UTIL_H
#ifdef CONFIG_FPU
typedef float fp_t;
typedef float fp_inter_t;
/* Conversion to/from fixed-point */
#define INT_TO_FP(x) ((float)(x))
#define FP_TO_INT(x) ((int32_t)(x))
/* Float to fixed-point, only for compile-time constants and unit tests */
#define FLOAT_TO_FP(x) ((float)(x))
/* Fixed-point to float, for unit tests */
#define FP_TO_FLOAT(x) ((float)(x))
#else
/* Fixed-point type */
typedef int32_t fp_t;
@@ -24,12 +37,24 @@ typedef int64_t fp_inter_t;
#define FLOAT_TO_FP(x) ((fp_t)((x) * (float)(1<<FP_BITS)))
/* Fixed-point to float, for unit tests */
#define FP_TO_FLOAT(x) ((float)(x) / (float)(1<<FP_BITS))
#endif
/*
* Fixed-point addition and subtraction can be done directly, because they
* work identically.
*/
#ifdef CONFIG_FPU
static inline fp_t fp_mul(fp_t a, fp_t b)
{
return a * b;
}
static inline fp_t fp_div(fp_t a, fp_t b)
{
return a / b;
}
#else
/**
* Multiplication - return (a * b)
*/
@@ -45,6 +70,7 @@ static inline fp_t fp_div(fp_t a, fp_t b)
{
return (fp_t)(((fp_inter_t)a << FP_BITS) / b);
}
#endif
/**
* Square (a * a)
@@ -59,7 +85,7 @@ static inline fp_t fp_sq(fp_t a)
*/
static inline fp_t fp_abs(fp_t a)
{
return (a >= 0 ? a : -a);
return (a >= INT_TO_FP(0) ? a : -a);
}
/*