Mirrors_Framework/nuttx
1
0
Fork 0
mirror of https://github.com/apache/nuttx.git synced 2026-06-06 00:14:22 +08:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

Use builtins for byteswapping

Browse Source 
Make use of XCHG/BSWAP on x86, REV16 and REV on ARMv6-m and above,
and whatever other optimized instructions on other platforms.

Defines extra CONFIG variables, and removes the unused functions for
endian-swapping. Fixes some oversights in using the macros.
This commit is contained in:
Nimish Telang
2022-06-19 16:24:55 -04:00
committed by Xiang Xiao
parent 7e6d93da4d
commit 903a186304
14 changed files with 54 additions and 225 deletions
Download Patch File Download Diff File Expand all files Collapse all files
libs/libc/string/lib_ffs.c
+3 -1
View File
@@ -55,7 +55,9 @@ int ffs(int j)
if (j != 0)
{
#ifdef CONFIG_HAVE_BUILTIN_CTZ
#ifdef CONFIG_HAVE_BUILTIN_FFS
ret = __builtin_ffs(j);
#elif defined (CONFIG_HAVE_BUILTIN_CTZ)
/* Count trailing zeros function can be used to implement ffs. */
ret = __builtin_ctz(j) + 1;
libs/libc/string/lib_ffsl.c
+3 -1
View File
@@ -55,7 +55,9 @@ int ffsl(long j)
if (j != 0)
{
#ifdef CONFIG_HAVE_BUILTIN_CTZ
#ifdef CONFIG_HAVE_BUILTIN_FFSL
ret = __builtin_ffsl(j);
#elif defined (CONFIG_HAVE_BUILTIN_CTZ)
/* Count trailing zeros function can be used to implement ffs. */
ret = __builtin_ctzl(j) + 1;
libs/libc/string/lib_ffsll.c
+3 -1
View File
@@ -57,7 +57,9 @@ int ffsll(long long j)
if (j != 0)
{
#ifdef CONFIG_HAVE_BUILTIN_CTZ
#ifdef CONFIG_HAVE_BUILTIN_FFSLL
ret = __builtin_ffsll(j);
#elif defined (CONFIG_HAVE_BUILTIN_CTZ)
/* Count trailing zeros function can be used to implement ffs. */
ret = __builtin_ctzll(j) + 1;