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Re: [Tinycc-devel] Duplicate double


From: Klaus Ebbe Grue
Subject: Re: [Tinycc-devel] Duplicate double
Date: Sat, 3 Aug 2019 14:14:43 +0000

Hi Avi,

 

Great! Thanks!

 

https://0x0.st/zOsg.7z worked.

 

Just to test, I made a fresh msys2 install, cloned git://repo.or.cz/tinycc.git and compiled. That also works.

 

For completeness, I have included the steps. The only surprise was that when using .configure --prefix=/usr I had to add --bindir=/usr/bin since otherwise tcc ends up in /usr/tcc.exe

 

Cheers,

Klaus

 

---

 

Remove C:\msys64 if present

Go to https://www.msys2.org/
Click msys2-x86_64-20190524.exe
Install msys2 using defaults

 

In MSYS2 shell:
> pacman -Syu
As instructed, kill and restart MSYS2 shell
> pacman -Syu
> pacman -S gcc git make texinfo
> git clone git://repo.or.cz/tinycc.git
> cd tinycc
> ./configure --prefix=/usr --bindir=/usr/bin
> make
> make install
> cd
> tcc -v
tcc version 0.9.27 (x86_64 Windows)
> mkdir experiment
> cd experiment
> cat>test.c
#include <stdio.h>
void f(double x,double y,double z){printf("f(%4.1f,%4.1f,%4.1f)\n",x,y,z);}
int main(int argc,char **argv){double u=0.0;f(u*1.0,7.0,8.0);return 0;}
> tcc -o test test.c
> ./test
f( 0.0, 7.0, 8.0)

 

 


Fra: Tinycc-devel [tinycc-devel-bounces+grue=address@hidden] på vegne af avih via Tinycc-devel [address@hidden]
Sendt: 3. august 2019 10:31
Til: address@hidden
Cc: avih
Emne: Re: [Tinycc-devel] Duplicate double

You're right, and I can confirm that the win64 version downloaded the
same as you exhibits the same issue, and the issue also exists if
I build 0.27 for win64 myself (git d348a9a).

However, it was apparently fixed shortly after tcc 0.27 was released,
at the following commit:

commit 8f6fcb709ae7b2379866c292ce478ab95dc75b48
Author: grischka <grischka>
Date: Thu May 31 23:51:51 2018 +0200

misc fixes

misc fixes including:
- tcc.c: fix "tcc -vv" for libtcc1.a on win32/PE
- tccelf.c: fix a crash when GOT has no relocs (witn -nostdlib)
- tccelf.c: fix stab linkage for zero n_strx
- tccgen.c: fix stdcall decoration for array parameters
int __stdcall func(char buf[10]) is _func@4 (was _func@12)
- tccgen.c: fix static variables with nocode/nodata_wanted
see tests2/96_nodata_wanted.c
- tccrun.c: align sections using sh_addralign (for reliable function_alignment)
- tests2/Makefile sort 100 after 99
- win32/include/sys/stat.h fix _stat and _wstat
- x86_64-gen.c: win64/gfunc_call: fix a bug with xmmN register args
previously overwrote valid other xmmN registers eventually


Not sure which of the fixes did it, but I'd guess it's at x86_64-gen.c .

If you want, I've built tcc for win32 and win64 from the latest git
version (mob, 9e429db), and uploaded it here: https://0x0.st/zOsg.7z

Cheers,
Avi



On Friday, August 2, 2019, 9:51:22 PM GMT+3, Klaus Ebbe Grue <address@hidden> wrote:


Hi tinycc-devel,

Under MSYS2/MinGW I have a problem with tcc.

I define this functions:

void f(double x,double y,double z){printf("f(%4.1f,%4.1f,%4.1f)\n",x,y,z);}

As an example, f(1,2,3) prints f( 1.0, 2.0, 3.0).

Then I call f from main in a slightly confusing way:

int main(int argc,char **argv){double u=0.0;f(u*1.0,7.0,8.0);return 0;}

I would expect to get f( 0.0, 7.0, 8.0) but I do get f( 7.0, 7.0, 8.0).

The first argument of f becomes a duplicate of the second argument of f.

If I remove "*1.0" then everything works as expected.

Is this a known bug?

By the way, if I make the same program using integers, then there is no problem.

I have included a reproduction scenario below.

Cheers,
Klaus

---

Install MSYS2/MinGW
Start MSYS2 shell

> mkdir experiment
> cd experiment
> pacman -S unzip
> unzip tcc-0.9.27-win64-bin.zip
> tcc/tcc -v
tcc version 0.9.27 (x86_64 Windows)
> cat>test.c
#include <stdio.h>
void f(double x,double y,double z){printf("f(%4.1f,%4.1f,%4.1f)\n",x,y,z);}
int main(int argc,char **argv){double u=0.0;f(u*1.0,7.0,8.0);return 0;}
> tcc/tcc -o test test.c
> ./test
f( 7.0, 7.0, 8.0)
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