Re: arm64 softfloat

[Andrei Borzenkov]

В Wed, 3 Jun 2015 12:06:50 +0100
Leif Lindholm <address@hidden> пишет:

> On Tue, Jun 02, 2015 at 07:51:12PM +0300, Andrei Borzenkov wrote:
> > > What is the relation of -mgeneral-regs-only with +nofp? The decription
> > > of -mgeneral-regs-only in manual is very vague
> > 
> > According to
> > http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0774a/chr1392305446662.html
> 
> That is ARM's commercial clang-based compiler suite though, not
> upstream clang.
>  
> > 1.16 -mgeneral-regs-only
> > 
> > Prevents the use of floating-point instructions or floating-point registers.
> > Note
> > The -mgeneral-regs-only option is only valid with the aarch64-arm-none-eabi 
> > target. Use -mfpu=none to prevent the use of floating-point instructions or 
> > floating-point registers for the armv8a-arm-none-eabi target.
> > 
> > The description is for armclang; we can just hope that GCC is using the
> > same semantic.
> 
> https://gcc.gnu.org/onlinedocs/gcc/AArch64-Options.html
> ---
> Generate code which uses only the general registers. 
> ---
> 

Sure, I know this. Unfortunately it does not say how it is related to
floating point arithmetic at all. armclang at least makes it explicit.

> http://clang.llvm.org/docs/UsersManual.html
> ---
> Generate code which only uses the general purpose registers.
> 
> This option restricts the generated code to use general registers
> only. This only applies to the AArch64 architecture.
> ---
> 
> /
>     Leif
> 
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