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Re: Bug in x86-64 psABI or in gcc?
Hi,
On Wed, 9 Dec 2009, H. Peter Anvin wrote:
> On 12/09/2009 06:56 AM, Michael Matz wrote:
> >>
> >> Aren't bits in the _Bool byte of"bar" specified by the psABI
> >
> > Right now they are specified in the psABI, you suggested to remove that
> > specification.
> >
>
> The intent of H.J.'s proposal is to require bits <7:1> == 0 in all cases
> (and higher bits as don't cares, the same way a char is passed),
Or bits <31:1> . But he also repeatedly suggests to remove the whole
sentence about the bit clearing. That's what I'm opposing. I'm not
against limiting the bit range that must be zero.
> opposed to the current text which requires <63:1> == 0 when passed as
> registers or on the stack (and <7:1> == 0 when stored in a memory
> object.) Furthermore, the current psABI text is inconsistent for
> arguments are return values; this is a bug in the wordsmithing of the
> text rather than intentional, if I remember the original discussions
> correctly.
Right, I remember the same.
Ciao,
Michael.