[PATCH] S/390: DFP support 1/4: Add z9-ec option

Janis Johnson janis187@us.ibm.com
Wed Mar 21 00:43:00 GMT 2007


On Fri, Mar 16, 2007 at 07:59:29PM +0100, Andreas Krebbel wrote:
> 
> The attached patch is the first of a patchset adding dfp hardware support to the
> s390 gcc back end.  The new instructions are documented here:
> http://publibfi.boulder.ibm.com/epubs/pdf/a2322320.pdf
> 
> 	* config/s390/s390.opt ("mhard-float", "msoft-float"): Bit value
> 	inverted and documentation adjusted.
> 	("mhard-dfp", "msoft-dfp"): New options.

For PowerPC* we're using -mdfp and -mno-dfp to enable hardware DFP
instructions (not yet implemented).  Hard and soft float are orthogonal
to hard and soft DFP on PowerPC; software emulation of DFP can use
either one, which affects how arguments are passed.

(I'm still catching up on gcc-patches after a bad cold.)

Janis



More information about the Gcc-patches mailing list