sergiotarxz/nuttx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

libc/math: Fix warning: dereferencing type-punned pointer will break strict-aliasing rules

Browse Source 
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I15aa5d664c20ea7bb95ba60e056134d2ff933db9
This commit is contained in:
Xiang Xiao 2020-06-29 22:40:25 +08:00 committed by Abdelatif Guettouche
parent 43b613877d
commit b71c491f00
1 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
libs/libc/math/lib_libsqrtapprox.c
View File

@ -38,13 +38,16 @@
float lib_sqrtapprox(float x) float lib_sqrtapprox(float x)
{ {
int32_t i; union
{
int32_t i;
float x;
} u;
/* Floats + bit manipulation = +inf fun! */ /* Floats + bit manipulation = +inf fun! */
i = *((int32_t *) & x); u.x = x;
i = 0x1fc00000 + (i >> 1); u.i = 0x1fc00000 + (u.i >> 1);
x = *((float *)&i);
return x; return u.x;
} }