diff options
| author | Dino Li <Dino.Li@ite.com.tw> | 2017-10-25 17:25:18 +0800 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2017-10-26 02:33:46 -0700 |
| commit | 54034c0b8a6a96bc05d7d801b11b0fbc061cf037 (patch) | |
| tree | d7ac4b638cd5e99b76c7492b27379ae1f9807dfb | |
| parent | a412a69bd2e91a4fa0981ffa61c06627e1cb9e0b (diff) | |
| download | chrome-ec-54034c0b8a6a96bc05d7d801b11b0fbc061cf037.tar.gz | |
nds32: add built-in function
A built-in function (__builtin_ffs) is missing after we sync down
the source code to latest.
Signed-off-by: Dino Li <dino.li@ite.com.tw>
BRANCH=none
BUG=none
TEST=We use the CL:730246 to verify this change, and
no error was received after running the test.
Change-Id: I5210f85db05650545c9924940e8b24e350b82f71
Reviewed-on: https://chromium-review.googlesource.com/730245
Commit-Ready: Dino Li <Dino.Li@ite.com.tw>
Tested-by: Dino Li <Dino.Li@ite.com.tw>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
| -rw-r--r-- | core/nds32/__builtin.c | 16 | ||||
| -rw-r--r-- | core/nds32/build.mk | 2 |
2 files changed, 17 insertions, 1 deletions
diff --git a/core/nds32/__builtin.c b/core/nds32/__builtin.c new file mode 100644 index 0000000000..45baa59aff --- /dev/null +++ b/core/nds32/__builtin.c @@ -0,0 +1,16 @@ +/* Copyright 2017 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "common.h" + +/* + * __builtin_ffs: + * Returns one plus the index of the least significant 1-bit of x, + * or if x is zero, returns zero. + */ +int __ffssi2(int x) +{ + return 32 - __builtin_clz(x & -x); +} diff --git a/core/nds32/build.mk b/core/nds32/build.mk index 5b87d85b15..523ac5300c 100644 --- a/core/nds32/build.mk +++ b/core/nds32/build.mk @@ -12,5 +12,5 @@ $(call set-option,CROSS_COMPILE,$(CROSS_COMPILE_nds32),nds32le-cros-elf-) # CPU specific compilation flags CFLAGS_CPU+=-march=v3m -Os -core-y=cpu.o init.o panic.o task.o switch.o __muldi3.o math.o +core-y=cpu.o init.o panic.o task.o switch.o __muldi3.o math.o __builtin.o core-$(CONFIG_FPU)+=__libsoftfpu.o |