add bittwiddling test

src/test/scala/ExamplesNoCompressed.scala

@@ -121,4 +121,11 @@ class ExamplesNoCompressed extends FreeSpec with PropertyChecks with Matchers {
 			""".trim.stripMargin
 	}
 
+	"bittwiddling" in {
+		Run( "tests/bittwiddling.hex" ) shouldBe
+			"""
+				|5, 0, 5
+			""".trim.stripMargin
+	}
+
 }

tests/bittwiddling.c

@@ -0,0 +1,66 @@
+void
+out( char c ) {
+	*((char*) 0x20000) = c;
+}
+
+//#include <stdio.h>
+//#define out( c ) putchar( c )
+
+void
+print( char* s ) {
+	while (*s)
+		out( *s++ );
+}
+
+void
+println() {
+	out( '\n' );
+}
+
+char*
+bin2str( int n, int radix, char* buf ) {
+	char digits[] = "0123456789ABCDEF";
+	char* p = &buf[33];
+	int quo = n;
+
+	if (n < 0)
+		quo = -quo;
+
+	*p-- = 0;
+
+	while (quo >= radix) {
+		*p-- = digits[(quo%radix)];
+		quo /= radix;
+	}
+
+	*p = digits[quo];
+
+	if (n < 0)
+		*--p = '-';
+
+	return p;
+}
+
+void
+printn( int n ) {
+	char buf[34];
+	char* s = bin2str( n, 10, buf );
+
+	print( s );
+}
+
+int
+abs( int x ) {
+  const int bit31 = x >> 31;
+  return (x ^ bit31) - bit31;
+}
+
+void
+main() {
+	printn( abs(5) );
+	print( ", " );
+	printn( abs(0) );
+	print( ", " );
+	printn( abs(-5) );
+	println();
+}

tests/bittwiddling.hex

@@ -0,0 +1,57 @@
+
+Hex dump of section '.text':
+  0x00010080 37010100 ef00c02a 73500000 00000000 7......*sP......
+  0x00010090 00000000 00000000 00000000 00000000 ................
+  0x000100a0 00000000 00000000 00000000 00000000 ................
+  0x000100b0 00000000 00000000 00000000 00000000 ................
+  0x000100c0 130101fe 233c8100 13040102 93070500 ....#<..........
+  0x000100d0 a307f4fe b7070200 0347f4fe 2380e700 .........G..#...
+  0x000100e0 13000000 03348101 13010102 67800000 .....4......g...
+  0x000100f0 130101fe 233c1100 23388100 13040102 ....#<..#8......
+  0x00010100 2334a4fe 6f00c001 833784fe 13871700 #4..o....7......
+  0x00010110 2334e4fe 83c70700 13850700 eff05ffa #4............_.
+  0x00010120 833784fe 83c70700 e39007fe 13000000 .7..............
+  0x00010130 83308101 03340101 13010102 67800000 .0...4......g...
+  0x00010140 130101ff 23341100 23308100 13040101 ....#4..#0......
+  0x00010150 1305a000 eff0dff6 13000000 83308100 .............0..
+  0x00010160 03340100 13010101 67800000 130101fc .4......g.......
+  0x00010170 233c8102 13040104 93070500 13870500 #<..............
+  0x00010180 2330c4fc 2326f4fc 93070700 2324f4fc #0..#&......#$..
+  0x00010190 b7070100 03b78738 2338e4fc 13878738 .......8#8.....8
+  0x000101a0 03378700 233ce4fc 93878738 83c70701 .7..#<.....8....
+  0x000101b0 2300f4fe 833704fc 93871702 2334f4fe #....7......#4..
+  0x000101c0 8327c4fc 2322f4fe 8327c4fc 9b870700 .'..#"...'......
+  0x000101d0 63d80700 832744fe bb07f040 2322f4fe c....'D....@#"..
+  0x000101e0 833784fe 1387f7ff 2334e4fe 23800700 .7......#4..#...
+  0x000101f0 6f000004 032744fe 832784fc bb67f702 o....'D..'...g..
+  0x00010200 1b870700 833784fe 9386f7ff 2334d4fe .....7......#4..
+  0x00010210 930604ff 3387e600 034707fe 2380e700 ....3....G..#...
+  0x00010220 032744fe 832784fc bb47f702 2322f4fe .'D..'...G..#"..
+  0x00010230 032744fe 832784fc 1b070700 9b870700 .'D..'..........
+  0x00010240 e35af7fa 832744fe 130704ff b307f700 .Z...'D.........
+  0x00010250 03c707fe 833784fe 2380e700 8327c4fc .....7..#....'..
+  0x00010260 9b870700 63de0700 833784fe 9387f7ff ....c....7......
+  0x00010270 2334f4fe 833784fe 1307d002 2380e700 #4...7......#...
+  0x00010280 833784fe 13850700 03348103 13010104 .7.......4......
+  0x00010290 67800000 130101fb 23341104 23308104 g.......#4..#0..
+  0x000102a0 13040105 93070500 232ef4fa 130704fc ........#.......
+  0x000102b0 8327c4fb 13060700 9305a000 13850700 .'..............
+  0x000102c0 eff0dfea 2334a4fe 033584fe eff05fe2 ....#4...5...._.
+  0x000102d0 13000000 83308104 03340104 13010105 .....0...4......
+  0x000102e0 67800000 130101fd 23348102 13040103 g.......#4......
+  0x000102f0 93070500 232ef4fc 8327c4fd 9bd7f741 ....#....'.....A
+  0x00010300 2326f4fe 0327c4fd 8327c4fe b347f700 #&...'...'...G..
+  0x00010310 1b870700 8327c4fe bb07f740 9b870700 .....'.....@....
+  0x00010320 13850700 03348102 13010103 67800000 .....4......g...
+  0x00010330 130101ff 23341100 23308100 13040101 ....#4..#0......
+  0x00010340 13055000 eff01ff5 b7070100 1385073a ..P............:
+  0x00010350 eff01fda 13050000 eff0dff3 b7070100 ................
+  0x00010360 1385073a eff0dfd8 13055000 eff09ff2 ...:......P.....
+  0x00010370 eff01fdd 13000000 83308100 03340100 .........0...4..
+  0x00010380 13010101 67800000                   ....g...
+
+
+Hex dump of section '.rodata':
+  0x00010388 30313233 34353637 38394142 43444546 0123456789ABCDEF
+  0x00010398 00000000 00000000 2c2000            ........, .
+