A tricky problem

[Xi Ruoyao]

On 2018-05-02 19:36 +0800, yiliang chen wrote:
> Since "fdiv" can be used in Intel dialect  and att dialect, Why not use "fdiv" instead of "fdivs"？

I don't know.  The "fdivs" is just written by Uros.  CC him here.

I didn't find the rules about inline assembly in GCC coding convention.

On 2018-05-02 19:26 +0800, Xi Ruoyao wrote:
> On 2018-05-02 18:47 +0800, yiliang chen wrote:
> > hi, When I compile Gcc with MSYS2 on Windows.I have encountered a thorny
> > issue.
> > 
> > In order to output the Intel assembly file by default, I modified the
> > gcc/config/i386/i386.opt file as follows
> > 
> > masm=
> > Target RejectNegative Joined Enum(asm_dialect) Var(ix86_asm_dialect)
> > Init(ASM_INTEL)
> > Use given assembler dialect.
> > 
> > however, An error occurred when compiling to
> > libgcc/config/i386/sfp-exceptions.c
> > file， it tell me :
> > 
> > C:\MSYS\MSYS32\tmp\cctIKXUx.s: Assembler messages:
> > C:\MSYS\MSYS32\tmp\cctIKXUx.s:69: Error: no such instruction: `fdivs DWORD
> > PTR [esp]'
> > C:\MSYS\MSYS32\tmp\cctIKXUx.s:135: Error: no such instruction: `fdivs DWORD
> > PTR [esp]'
> > 
> > I checked Intel's developer's manual，I can't find a description of this
> > directive. So I want to know what's going on.
> 
> "fdivs" should be "fdiv" in intel dialect.
> 
> This instruction is in an inline assembly statement
> (libgcc/config/i386/sfp-exceptions.c:103).  GCC don't know how to convert it
> to Intel dialect.
-- 
Xi Ruoyao <ryxi@stu.xidian.edu.cn>
School of Aerospace Science and Technology, Xidian University