diff options
| author | Tom Hughes <tomhughes@chromium.org> | 2021-10-01 21:11:39 +0000 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2021-11-03 22:59:53 +0000 |
| commit | 1afc2d2704568e5d587eb2ceb18802a4d9bdf7af (patch) | |
| tree | 096da1b2e939eb287c7a41ef2dba69c9c8d7de98 | |
| parent | d6271635b6a8cdc875626433cef4faed4d068fcc (diff) | |
| download | chrome-ec-1afc2d2704568e5d587eb2ceb18802a4d9bdf7af.tar.gz | |
core/cortex-m0: Use compiler_rt version of clz and ctz
Use __clzsi2 and __ctzsi2 from compiler_rt instead of our own version.
Using the compiler_rt versions result in a slightly smaller image.
servo_micro before this change:
RO: 18744 bytes in flash remaining
RW: 23192 bytes in flash remaining
servo_micro after this change:
RO: 18808 bytes in flash remaining
RW: 23256 bytes in flash remaining
BRANCH=none
BUG=b:172020503
TEST=CC=clang make BOARD=servo_micro
TEST=make buildall
Signed-off-by: Tom Hughes <tomhughes@chromium.org>
Change-Id: Ibc19a3670127dde211fb20d247c1284d0aec5f61
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3199739
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
| -rw-r--r-- | core/cortex-m0/config_core.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/core/cortex-m0/config_core.h b/core/cortex-m0/config_core.h index c31adc471c..a40756fb49 100644 --- a/core/cortex-m0/config_core.h +++ b/core/cortex-m0/config_core.h @@ -10,9 +10,14 @@ #define BFD_ARCH arm #define BFD_FORMAT "elf32-littlearm" -/* Emulate the CLZ/CTZ instructions since the CPU core is lacking support */ +/* + * Emulate the CLZ/CTZ instructions since the CPU core is lacking support. + * When building with clang, we rely on compiler_rt to provide this support. + */ +#ifndef __clang__ #define CONFIG_SOFTWARE_CLZ #define CONFIG_SOFTWARE_CTZ +#endif /* __clang__ */ #define CONFIG_SOFTWARE_PANIC #define CONFIG_ASSEMBLY_MULA32 |