Patch to add -mfp32 support to MIPS gas

[Thiemo Seufer]

Richard Sandiford wrote:
> 
> At the moment, MIPS gas uses:
> 
> 	ISA_HAS_64BIT_REGS (mips_opts.isa)
> 
> to decide what size the registers are and:
> 
> 	bfd_arch_bits_per_address (stdoutput) == 32
> 	|| ! ISA_HAS_64BIT_REGS (mips_opts.isa)
> 
> to decide what size addresses are.  That isn't as fine grain as GCC, which
> allows the sizes of the FPRs and GPRs to be selected independently.

Just curious: Who needs to set GPR/FPR sizes explicitly on MIPS?
It's usually a ABI property.

[snip]
> +#define HAVE_32BIT_GPRS					\
> +   (mips_gp32 || ! ISA_HAS_64BIT_REGS (mips_opts.isa))
> +
> +#define HAVE_32BIT_FPRS					\
> +   (mips_fp32 || ! ISA_HAS_64BIT_REGS (mips_opts.isa))
> +
> +#define HAVE_64BIT_GPRS (! HAVE_32BIT_GPRS)
> +#define HAVE_64BIT_FPRS (! HAVE_32BIT_FPRS)
> +
> +#define HAVE_32BIT_ADDRESSES				\
> +   (HAVE_32BIT_GPRS || bfd_arch_bits_per_address (stdoutput) == 32)

How is mips_32bitmode handled WRT this?

[snip]
> @@ -9247,6 +9146,14 @@ md_parse_option (c, arg)
>  #endif
>        break;
>  
> +    case OPTION_FP32:
> +      mips_fp32 = 1;
> +      break;
> +
> +    case OPTION_FP64:
> +      mips_fp32 = 0;
> +      break;

Perhaps there should be some checking for consistency with ABI's
definitions then.


Thiemo