Path: utzoo!utgpu!water!watmath!clyde!bellcore!decvax!ucbvax!CORY.BERKELEY.EDU!dillon
From: dillon@CORY.BERKELEY.EDU (Matt Dillon)
Newsgroups: comp.sys.amiga
Subject: Re: Structure alignment in Manx C
Message-ID: <8802171829.AA10038@cory.Berkeley.EDU>
Date: 17 Feb 88 18:29:33 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 15

:In article <8802160646.AA14996@cory.Berkeley.EDU> dillon@CORY.BERKELEY.EDU (Matt Dillon) writes:
:>		ptr = salloc(bytes)	(allocates on a longword boundry)
:>		spop()			pops the allocated stack frame, must
:>					call before return statement / end of
:>					subroutine.
:
:	Actually, spop() isn't needed before an exit at all.  Lattice
:(and I'm fairly sure Manx) use the unlink instruction, which will restore
:the old stack pointer.  The only thing to watch out for is stack overflow.

	Yes, they do use LINK/UNLK, but they also use MOVEM REGS,-(SP) to
save registers, and before the RTS do a MOVEM (SP)+,REGS.  If the SP isn't
in the right place, a bogus set of registers will be restored.

					-Matt