"Could not find a spill register" problem with ns32k; gcc 2.95.3

[Simon Burge <simonb at wasabisystems dot com>]

Hi,

I'm playing with bringing my pc532 (ns32532-based) box up to gcc 2.95.3.
Here's the complete version:

	Reading specs from /usr/local/lib/gcc-lib/ns32k-netbsd/2.95.3/specs
	gcc version 2.95.3 20010315 (release)

To get 2.95.3 to build, I needed to delete the

	xm_file="${xm_file} ns32k/xm-netbsd.h"

line from the "ns32k-*-netbsd*" case in configure.in/configure.  The
configure line (configured as part of a script) is

	/usr/src/gnu/dist/toolchain/configure \
	    --with-gcc-version-trigger=/usr/src/gnu/dist/toolchain/gcc/version.c \
	    --host=ns32k-unknown-netbsd1.5X --target=ns32k-netbsd --norecursion 

When I tried to compile one of the NetBSD kernel files, I got a "Could
not find a spill register" error.  The source code below is a cut-down
version that reproduces the error (this contains a few warnings, the
original code did not).  Here's a run with the error:

	pc532:~ 1285> /usr/local/gnu/bin/cc -v -O -c nfs_vnops.c
	Reading specs from /usr/local/lib/gcc-lib/ns32k-netbsd/2.95.3/specs
	gcc version 2.95.3 20010315 (release)
	 /usr/local/lib/gcc-lib/ns32k-netbsd/2.95.3/cpp0 -lang-c -v -D__GNUC__=2 -D__GNUC_MINOR__=95 -Dns32k -Dns32000 -Dns32532 -D__NetBSD__ -Dpc532 -D__ns32k__ -D__KPRINTF_ATTRIBUTE__ -D__ns32k__ -D__ns32000__ -D__ns32532__ -D__NetBSD__ -D__pc532__ -D__ns32k__ -D__KPRINTF_ATTRIBUTE__ -D__ns32k -D__ns32000 -D__ns32532 -D__pc532 -Asystem(unix) -Asystem(NetBSD) -Acpu(ns32k) -Amachine(ns32k) -D__OPTIMIZE__ nfs_vnops.c /var/tmp/ccTjGYUY.i
	GNU CPP version 2.95.3 20010315 (release) (32000, GAS syntax)
	#include "..." search starts here:
	#include <...> search starts here:
	 /usr/local/lib/gcc-lib/ns32k-netbsd/2.95.3/include
	 /usr/local/lib/gcc-lib/ns32k-netbsd/2.95.3/../../../../ns32k-netbsd/include
	End of search list.
	The following default directories have been omitted from the search path:
	 /usr/local/lib/gcc-lib/ns32k-netbsd/2.95.3/../../../../include/g++-3
	 /usr/local/lib/gcc-lib/ns32k-netbsd/2.95.3/../../../../ns32k-netbsd/sys-include
	End of omitted list.
	 /usr/local/lib/gcc-lib/ns32k-netbsd/2.95.3/cc1 /var/tmp/ccTjGYUY.i -quiet -dumpbase nfs_vnops.c -O -version -o /var/tmp/ccfMz9Ui.s
	GNU C version 2.95.3 20010315 (release) (ns32k-netbsd) compiled by GNU C version egcs-2.91.66 19990314 (egcs-1.1.2 release).
	nfs_vnops.c: In function `foo':
	nfs_vnops.c:44: Could not find a spill register
	(insn 97 96 98 (set (mem:SI (plus:SI (reg/v:SI 5 r5)
			(reg:SI 47)) 0)
		(mem:SI (reg/v:SI 31) 0)) 15 {movsi} (insn_list 96 (nil))
	    (expr_list:REG_DEAD (reg:SI 47)
		(nil)))

If I use "-O0" or "-O2" instead of "-O", the file compiles successfully.

Simon.
--
Simon Burge                            <simonb@wasabisystems.com>
NetBSD CDs, Support and Service:    http://www.wasabisystems.com/

----------------------------------- cut here -----------------------------------
struct s1 {
	int s1len;		 
};
 
int
foo(int *p1)
{
	struct s1 *s1;
	int i1, i2, i3, i4, i5, i6, i7, i8, *ip1, *ip2;

	while (i6 && i1) {
		if (i5)
			ip2 = ip1;
		else {
			i2 = i5;
			foo3(i5);
			goto out;
		}
		 
		while (i6 && i1) {
			if (i5)
				ip2 = (ip1);
			else if ((i5 = foo1()) != 0) {
				i2 = i5;
				foo3(i5);
				goto out;
			}
			i4 = *ip2;
			i7 = i8;
			if (i8 > i3)
				*((int *)((char *)s1 + s1->s1len)) = *p1;
			if (i1) {
				s1->s1len = i7;
				if (i4 > 0 && (i5 = foo2(&i5, i4)) != 0) {
					i2 = i5;
					foo3(i5);
					goto out;
				}
			}
		}
	}
out:
	return (i2);
}