egcs-1.0.3: mc68k/mcf5200 codegen bug when optimizing

[Rune Skårsmoen]

target=m68k-coff, crosscompiling (from both sun/solaris2 and 
{m68k|i586}-linux)

egcs-1.0.2 and egcs-1.0.3(a)

The following function generates illegal opcodes for ColdFire when 
optimizing.  compiler call:  m68k-coff-gcc -O2 -m5200 -S func.c



short
func(void)
{
	unsigned char x, y;

	return  y | x << 8;
}


This doesn't happen when func() returns an int instead of a short, or when
x and y are signed.



	.file	"func.c"
gcc2_compiled.:
__gnu_compiled_c:
.text
	.even
.globl func
func:
	link.w %a6,#0
	and.w #0xFF,%d0			| illegal for coldfire
	and.w #0xFF,%d1			| ditto
	lsl.l #8,%d1
	or.l %d1,%d0
	ext.l %d0
	unlk %a6
	rts



Is this enough information for a fix?