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由 baiyu33 提交于
For compatiblity for old compilers such as ndk-r16b. `fabs()` keeps result stable. ref: https://github.com/Tencent/ncnn/issues/2372
e07faf34
For compatiblity for old compilers such as ndk-r16b. `fabs()` keeps result stable. ref: https://github.com/Tencent/ncnn/issues/2372