(synth64.[ds]): New testcase.

gas/testsuite/gas/sparc/.Sanitize

@@ -29,6 +29,8 @@ membar.d
 membar.s
 prefetch.d
 prefetch.s
+synth64.d
+synth64.s
 sparc.exp
 
 Things-to-lose:

gas/testsuite/gas/sparc/synth64.d

@@ -0,0 +1,18 @@
+#objdump: -dr
+#name: sparc64 synth64
+
+.*: +file format .*sparc.*
+
+Disassembly of section .text:
+0+0000 <foo-4> iprefetch  0+0004 <foo>
+0+0004 <foo> signx  %g1, %g2
+0+0008 <foo\+4> clruw  %g1, %g2
+0+000c <foo\+8> cas  \[ %g1 \], %g2, %g3
+0+0010 <foo\+c> casl  \[ %g1 \], %g2, %g3
+0+0014 <foo\+10> casx  \[ %g1 \], %g2, %g3
+0+0018 <foo\+14> casxl  \[ %g1 \], %g2, %g3
+0+001c <foo\+18> clrx  \[ %g1 \+ %g2 \]
+0+0020 <foo\+1c> clrx  \[ %g1 \]
+0+0024 <foo\+20> clrx  \[ %g1 \+ 1 \]
+0+0028 <foo\+24> clrx  \[ %g1 \+ 0x2a \]
+0+002c <foo\+28> clrx  \[ 0x42 \]

gas/testsuite/gas/sparc/synth64.s

@@ -0,0 +1,16 @@
+# sparc64 synthetic insns
+	.text
+	iprefetch foo
+foo:
+	signx %g1,%g2
+	clruw %g1,%g2
+	cas [%g1],%g2,%g3
+	casl [%g1],%g2,%g3
+	casx [%g1],%g2,%g3
+	casxl [%g1],%g2,%g3
+
+	clrx [%g1+%g2]
+	clrx [%g1]
+	clrx [%g1+1]
+	clrx [42+%g1]
+	clrx [0x42]