回复： [musl] 回复： [musl ] [math] The math library have some bugforceil,floor,round functioin, in arm mode

[bobodog <8192542@qq.com>]

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1) enter the musl's source code
cd /home/jjj/test/musl/


2) pull the newest codes
git pull origin master


3) export some toolchains
export PATH=$PATH:/home/jjj/9tripod/android_exynos4412_ics_rtm_v10/prebuilt/linux-x86/toolchain/arm-2009q3/bin/


4) configure musl to arm target
CC=arm-none-linux-gnueabi-gcc ./configure --target=arm --prefix=/home/jjj/test/musl/usr/local/musl/


5) compiler musl and install
make
make install


6) export REALGCC to arm linux toolchains
export REALGCC=arm-none-linux-gnueabi-gcc


7) write test cases and save to test.c
#include <stdio.h>
#include <math.h>


int main(int argc, char ** argv)
{
	double n = 0.0;
	int i;


	for(i = 0; i < 20; i++)
	{
		n = n - 0.125;
		printf("ceil(%f) = %f, floor(%f) = %f, round(%f) = %f\n", n, ceil(n), n, floor(n), n, round(n));
	}


	return 0;
}


8) compile test cases
./tools/musl-gcc test.c -o test -static


9) file test, will showing: test: ELF 32-bit LSB executable, ARM, version 1 (SYSV), statically linked, not stripped
file test


10) running test case using qemu-arm
qemu-arm test


11) result...
ceil(-0.125000) = -0.000000, floor(-0.125000) = -1.000000, round(-0.125000) = -0.000000
ceil(-0.250000) = -0.000000, floor(-0.250000) = -1.000000, round(-0.250000) = -0.000000
ceil(-0.375000) = -0.000000, floor(-0.375000) = -1.000000, round(-0.375000) = -0.000000
ceil(-0.500000) = -0.000000, floor(-0.500000) = -1.000000, round(-0.500000) = -1.000000
ceil(-0.625000) = -0.000000, floor(-0.625000) = -1.000000, round(-0.625000) = -1.000000
ceil(-0.750000) = -0.000000, floor(-0.750000) = -1.000000, round(-0.750000) = -1.000000
ceil(-0.875000) = -0.000000, floor(-0.875000) = -1.000000, round(-0.875000) = -1.000000
ceil(-1.000000) = -1.000000, floor(-1.000000) = -1.000000, round(-1.000000) = -1.000000
ceil(-1.125000) = -1.000000, floor(-1.125000) = -2.000000, round(-1.125000) = -1.000000
ceil(-1.250000) = -1.000000, floor(-1.250000) = -2.000000, round(-1.250000) = -1.000000
ceil(-1.375000) = -1.000000, floor(-1.375000) = -2.000000, round(-1.375000) = -1.000000
ceil(-1.500000) = -1.000000, floor(-1.500000) = -2.000000, round(-1.500000) = -2.000000
ceil(-1.625000) = -1.000000, floor(-1.625000) = -2.000000, round(-1.625000) = -2.000000
ceil(-1.750000) = -1.000000, floor(-1.750000) = -2.000000, round(-1.750000) = -2.000000
ceil(-1.875000) = -1.000000, floor(-1.875000) = -2.000000, round(-1.875000) = -2.000000
ceil(-2.000000) = -2.000000, floor(-2.000000) = -2.000000, round(-2.000000) = -2.000000
ceil(-2.125000) = -2.000000, floor(-2.125000) = -3.000000, round(-2.125000) = -2.000000
ceil(-2.250000) = -2.000000, floor(-2.250000) = -3.000000, round(-2.250000) = -2.000000
ceil(-2.375000) = -2.000000, floor(-2.375000) = -3.000000, round(-2.375000) = -2.000000
ceil(-2.500000) = -2.000000, floor(-2.500000) = -3.000000, round(-2.500000) = -3.000000


Using qemu-arm, the result is correct. we will test in real hardware and review result, and find bug somewhere
‍




------------------
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蒋建军                            
深圳市九鼎创展科技有限公司
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------------------ 原始邮件 ------------------
发件人: "Rich Felker";<dalias@libc.org>;
发送时间: 2014年10月14日(星期二) 中午11:03
收件人: "bobodog"<8192542@qq.com>; 
抄送: "musl"<musl@lists.openwall.com>; 
主题: Re: [musl] 回复： [musl ] [math] The math library have some bugforceil,floor,round functioin, in arm mode



On Tue, Oct 14, 2014 at 10:51:58AM +0800, bobodog wrote:
> Test it in qemu-system-arm, with soft fp, realview-pb-a8 platform‍
> 
> we porting musl to our project, and just write test functions to
> test cases, i don't kown, how to test musl in origin test cases.

Can you show a complete test program with correct prototypes for
printf, ceil, floor, and round that exhibits the problem for you?

Rich

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