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Re: PPro and egcs
- To: law at cygnus dot com
- Subject: Re: PPro and egcs
- From: hjl at lucon dot org (H.J. Lu)
- Date: Mon, 27 Oct 1997 13:05:17 -0800 (PST)
- Cc: egcs at cygnus dot com
>
>
> In message <m0xPI2T-0004edC@ocean.lucon.org>you write:
> > Hi,
> >
> > Has anyone tried egcs on PPro? I got an error.
> >
> > # gcc -O -march=i686 -S foo.c -fomit-frame-pointer
> > foo.c: In function `nfs_readpage_sync':
> > foo.c:1618: internal error--insn does not satisfy its constraints:
> > (insn 317 316 139 (parallel[
> > (set (reg/v:SI 3 %ebx)
> > (if_then_else:SI (ne (cc0)
> > (const_int 0))
> > (reg:SI 0 %eax)
> > (const_int -22)))
> > (clobber (reg:SI 0 %eax))
> > ] ) 374 {movsicc_1} (nil)
> > (expr_list:REG_DEAD (reg:SI 0 %eax)
> > (expr_list:REG_UNUSED (reg:SI 0 %eax)
> > (nil))))
> > gcc: Internal compiler error: program cc1 got fatal signal 6
> I don't have a ppro, nor do I know anything about the architecture.
>
> Can the cmov instruction accept a constant as a source operand?
>
No. How about we do this?
If operands 2/3 are immediate operands, we emit
jmp next
.align 4
operand2:
.4bytes operand2
operand3:
.4bytes operand3
next:
cmovxx operand2,operand0
cmovyy operand3,operand0
Will this work?
H.J.