W must be 8 bytes wide.  this is because W is the same as A,
but pulls its punches.  when debugging a 64-bit executable,
	1\W	-> 0x00000001
	1\A	-> 0x0000000000000001
note: since the default mach is mips, you have to be debugging
a 64-bit executable to see this difference.

Reference: /n/atom/patch/applied/acidwfix
Date: Sun Feb 16 15:43:31 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/acid/builtin.c	Sun Feb 16 15:41:22 2014
+++ /sys/src/cmd/acid/builtin.c	Sun Feb 16 15:41:23 2014
@@ -1068,6 +1068,9 @@
 	case 'V':
 		Bprint(bout, "%lld", res->ival);
 		break;
+	case 'W':
+		Bprint(bout, "%.8llux", res->ival);
+		break;
 	case 'Y':
 		Bprint(bout, "%.16llux", res->ival);
 		break;
@@ -1078,7 +1081,6 @@
 		Bprint(bout, "0%.6uo", (int)res->ival);
 		break;
 	case 'A':
-	case 'W':
 		switch(mach->szaddr){
 		default:
 			sysfatal("acid: szaddr %d unhandled", mach->szaddr);
--- /sys/src/cmd/acid/expr.c	Sun Feb 16 15:41:24 2014
+++ /sys/src/cmd/acid/expr.c	Sun Feb 16 15:41:25 2014
@@ -20,7 +20,7 @@
 	['S'] 4,
 	['U'] 4,
 	['V'] 8,
-//	['W'] 8,
+	['W'] 8,
 	['X'] 4,
 	['Y'] 8,
 	['Z'] 8,
@@ -53,7 +53,6 @@
 		return ret;
 	case 'a':
 	case 'A':
-	case 'W':
 		return mach->szaddr;
 	case 'i':
 	case 'I':
--- /sys/src/cmd/acid/util.c	Sun Feb 16 15:41:26 2014
+++ /sys/src/cmd/acid/util.c	Sun Feb 16 15:41:27 2014
@@ -230,10 +230,10 @@
 		break;
 	case 'a':
 	case 'A':
-	case 'W':
 		ret = getn(map, s->v->ival, &v, fmtsize(s->v));
 		break;
 	case 'V':
+	case 'W':
 	case 'Y':
 	case 'Z':
 		ret = get8(map, s->v->ival, &v);