Add bitrev test

src/bitrev.gdb

@@ -0,0 +1,2 @@
+c
+info registers r6 r7 r8 r9 r10 r11 r12 r13

src/bitrev.log

@@ -0,0 +1,13 @@
+Breakpoint 1 at 0x10078
+Breakpoint 2 at 0x10100
+0x0000000000010078 in _start ()
+
+Breakpoint 2, 0x0000000000010100 in _stop ()
+r6                            <00> 0xc2e01e6a2c48	214267838737480
+r7                            <00> 0x1000f77db57b	17596338255227
+r8                            <00> 0x50505050	1347440720
+r9                            <00> 0x7b03b57b	2063840635
+r10                           <00> 0xf7b3d591e6a2c48	1115552785675988040
+r11                           <00> 0x5353b77f7f5300	23454470650155776
+r12                           <00> 0x505050505050505	361700864190383365
+r13                           <00> 0xb55d885f735ff77d	13068751637237987197

src/bitrev.s

@@ -0,0 +1,29 @@
+.global _start
+.global _stop
+
+_start:
+{
+	adds 0, 0x12345678, %r0
+	adds 0, 0xdeadbeef, %r1
+	adds 0, 0x0a0a0a0a, %r2
+}
+{
+	addd 0, 0x123456789abcdef0, %r3
+	addd 0, 0x00cafefeedcaca00, %r4
+}
+{
+	addd 0, 0xa0a0a0a0a0a0a0a0, %r5
+	bitrevs %r0, %r6
+	bitrevs %r1, %r7
+	bitrevs %r2, %r8
+	bitrevs 0xdeadc0de, %r9
+}
+{
+	bitrevd %r3, %r10
+	bitrevd %r4, %r11
+	bitrevd %r5, %r12
+	bitrevd 0xbeeffacefa11baad, %r13
+}
+
+_stop:
+	udivs 0, 0, %empty