gas: correct ignoring of C-style number suffixes

First of all the respective original changes didn't deal with just 0
having such a suffix - this needs additional logic outside of
integer_constant(). Further bogus suffixes having more than two L-s
were accepted, while valid suffixes with U following the L(s) weren't.
Finally respective tests were introduced for Sparc only.

Reviewed-by: Neal Frager <neal.frager@amd.com>

gas/expr.c

@@ -538,17 +538,26 @@ integer_constant (int radix, expressionS *expressionP)
 #ifndef tc_allow_U_suffix
 #define tc_allow_U_suffix 1
 #endif
+  bool u_seen = !tc_allow_U_suffix;
   /* PR 19910: Look for, and ignore, a U suffix to the number.  */
-  if (tc_allow_U_suffix && (c == 'U' || c == 'u'))
-    c = * input_line_pointer++;
+  if (!u_seen && (c == 'U' || c == 'u'))
+    {
+      c = *input_line_pointer++;
+      u_seen = true;
+    }
 
 #ifndef tc_allow_L_suffix
 #define tc_allow_L_suffix 1
 #endif
   /* PR 20732: Look for, and ignore, a L or LL suffix to the number.  */
-  if (tc_allow_L_suffix)
-    while (c == 'L' || c == 'l')
+  if (tc_allow_L_suffix && (c == 'L' || c == 'l'))
+    {
       c = * input_line_pointer++;
+      if (c == 'L' || c == 'l')
+	c = *input_line_pointer++;
+      if (!u_seen && (c == 'U' || c == 'u'))
+	c = *input_line_pointer++;
+    }
 
   if (small)
     {
@@ -888,6 +897,19 @@ operand (expressionS *expressionP, enum expr_mode mode)
 	    input_line_pointer++;
 	  goto default_case;
 
+	case 'l':
+	case 'L':
+	  /* Accept an L suffix to the zero.  */
+	  if (tc_allow_L_suffix)
+	    goto numeric;
+	  goto default_case;
+
+	case 'u':
+	case 'U':
+	  /* Accept a U suffix to the zero.  */
+	  if (!tc_allow_U_suffix)
+	    goto default_case;
+	  /* Fall through.  */
 	case '0':
 	case '1':
 	case '2':
@@ -896,6 +918,7 @@ operand (expressionS *expressionP, enum expr_mode mode)
 	case '5':
 	case '6':
 	case '7':
+	numeric:
 	  integer_constant ((flag_m68k_mri || NUMBERS_WITH_SUFFIX)
 			    ? 0 : 8,
 			    expressionP);

gas/testsuite/gas/all/const-1.l

@@ -0,0 +1,64 @@
+# This should match the output of gas -alm const-1.s.
+.*: Assembler messages:
+.*:5: Error: .*`l'
+.*:18:  Info: .*
+.*:6: Error: .*`l'
+.*:18:  Info: .*
+.*:7: Error: .*`l'
+.*:18:  Info: .*
+.*:8: Error: .*`l'
+.*:18:  Info: .*
+.*:5: Error: .*`u'
+.*:19:  Info: .*
+.*:6: Error: .*`u'
+.*:19:  Info: .*
+.*:7: Error: .*`u'
+.*:19:  Info: .*
+.*:8: Error: .*`u'
+.*:19:  Info: .*
+.*:5: Error: .*`l'
+.*:20:  Info: .*
+.*:6: Error: .*`l'
+.*:20:  Info: .*
+.*:7: Error: .*`l'
+.*:20:  Info: .*
+.*:8: Error: .*`l'
+.*:20:  Info: .*
+.*GAS .*/const-1\.s[ 	].*
+#...
+[ 	]*[0-9]*[ 	]+const u
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 0u
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 00u
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 0x0u
+[ 	]*[0-9]*[ 	]+\?\?\?\? 01[ 	]+>  \.byte 1u
+[ 	]*[0-9]*[ 	]+const l
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 0l
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 00l
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 0x0l
+[ 	]*[0-9]*[ 	]+\?\?\?\? 01[ 	]+>  \.byte 1l
+[ 	]*[0-9]*[ 	]+const ul
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 0ul
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 00ul
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 0x0ul
+[ 	]*[0-9]*[ 	]+\?\?\?\? 01[ 	]+>  \.byte 1ul
+[ 	]*[0-9]*[ 	]+const lu
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 0lu
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 00lu
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 0x0lu
+[ 	]*[0-9]*[ 	]+\?\?\?\? 01[ 	]+>  \.byte 1lu
+[ 	]*[0-9]*[ 	]+const ll
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 0ll
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 00ll
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 0x0ll
+[ 	]*[0-9]*[ 	]+\?\?\?\? 01[ 	]+>  \.byte 1ll
+[ 	]*[0-9]*[ 	]+const llu
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 0llu
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 00llu
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 0x0llu
+[ 	]*[0-9]*[ 	]+\?\?\?\? 01[ 	]+>  \.byte 1llu
+[ 	]*[0-9]*[ 	]+const ull
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 0ull
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 00ull
+[ 	]*[0-9]*[ 	]+\?\?\?\? 00[ 	]+>  \.byte 0x0ull
+[ 	]*[0-9]*[ 	]+\?\?\?\? 01[ 	]+>  \.byte 1ull
+#pass

gas/testsuite/gas/all/const-1.s

@@ -0,0 +1,20 @@
+	.data
+data:
+
+	.macro const, sfx
+	.byte 0\sfx
+	.byte 00\sfx
+	.byte 0x0\sfx
+	.byte 1\sfx
+	.endm
+
+	const u
+	const l
+	const ul
+	const lu
+	const ll
+	const llu
+	const ull
+	const lll
+	const ulu
+	const lul

gas/testsuite/gas/all/gas.exp

@@ -469,6 +469,11 @@ run_list_test cond-2 "-al"
 setup_xfail "tic30-*-*"
 run_list_test linefile ""
 
+# Again, .byte does not emit 8 bits on either tic4x or tic54x.
+if { ![istarget "tic4x*-*-*"] && ![istarget "tic54x*-*-*"] } {
+    run_list_test const-1 "-alm"
+}
+
 run_list_test macro "-alm"
 
 run_list_test pr20312