x86: extend FPU test coverage for AT&T / Intel mnemonic differences

Before touching the templates, let's ensure we actually cover things:
For one FSUB{,R} and FDIV{,R} would better be tested with operands in
both possible orders. And then -mmnemonic=intel wasn't tested at all.

gas/testsuite/gas/i386/compat-intel.d

@@ -9,18 +9,22 @@ Disassembly of section .text:
 
 0+ <.text>:
 [ 	]*[a-f0-9]+:	dc e3                	fsubr  st\(3\),st
+[ 	]*[a-f0-9]+:	d8 e3                	fsub   st,st\(3\)
 [ 	]*[a-f0-9]+:	de e1                	fsubrp st\(1\),st
 [ 	]*[a-f0-9]+:	de e3                	fsubrp st\(3\),st
 [ 	]*[a-f0-9]+:	de e3                	fsubrp st\(3\),st
 [ 	]*[a-f0-9]+:	dc eb                	fsub   st\(3\),st
+[ 	]*[a-f0-9]+:	d8 eb                	fsubr  st,st\(3\)
 [ 	]*[a-f0-9]+:	de e9                	fsubp  st\(1\),st
 [ 	]*[a-f0-9]+:	de eb                	fsubp  st\(3\),st
 [ 	]*[a-f0-9]+:	de eb                	fsubp  st\(3\),st
 [ 	]*[a-f0-9]+:	dc f3                	fdivr  st\(3\),st
+[ 	]*[a-f0-9]+:	d8 f3                	fdiv   st,st\(3\)
 [ 	]*[a-f0-9]+:	de f1                	fdivrp st\(1\),st
 [ 	]*[a-f0-9]+:	de f3                	fdivrp st\(3\),st
 [ 	]*[a-f0-9]+:	de f3                	fdivrp st\(3\),st
 [ 	]*[a-f0-9]+:	dc fb                	fdiv   st\(3\),st
+[ 	]*[a-f0-9]+:	d8 fb                	fdivr  st,st\(3\)
 [ 	]*[a-f0-9]+:	de f9                	fdivp  st\(1\),st
 [ 	]*[a-f0-9]+:	de fb                	fdivp  st\(3\),st
 [ 	]*[a-f0-9]+:	de fb                	fdivp  st\(3\),st

gas/testsuite/gas/i386/compat-intel2.d

@@ -0,0 +1,31 @@
+#as: -mmnemonic=intel
+#objdump: -d -Mintel-mnemonic
+#name: i386 float Intel mnemonic (2)
+#source: compat.s
+
+.*: +file format .*
+
+Disassembly of section .text:
+
+0+ <.text>:
+[ 	]*[a-f0-9]+:	dc eb                	fsub   st\(3\),st
+[ 	]*[a-f0-9]+:	d8 e3                	fsub   st,st\(3\)
+[ 	]*[a-f0-9]+:	de e9                	fsubp  st\(1\),st
+[ 	]*[a-f0-9]+:	de eb                	fsubp  st\(3\),st
+[ 	]*[a-f0-9]+:	de eb                	fsubp  st\(3\),st
+[ 	]*[a-f0-9]+:	dc e3                	fsubr  st\(3\),st
+[ 	]*[a-f0-9]+:	d8 eb                	fsubr  st,st\(3\)
+[ 	]*[a-f0-9]+:	de e1                	fsubrp st\(1\),st
+[ 	]*[a-f0-9]+:	de e3                	fsubrp st\(3\),st
+[ 	]*[a-f0-9]+:	de e3                	fsubrp st\(3\),st
+[ 	]*[a-f0-9]+:	dc fb                	fdiv   st\(3\),st
+[ 	]*[a-f0-9]+:	d8 f3                	fdiv   st,st\(3\)
+[ 	]*[a-f0-9]+:	de f9                	fdivp  st\(1\),st
+[ 	]*[a-f0-9]+:	de fb                	fdivp  st\(3\),st
+[ 	]*[a-f0-9]+:	de fb                	fdivp  st\(3\),st
+[ 	]*[a-f0-9]+:	dc f3                	fdivr  st\(3\),st
+[ 	]*[a-f0-9]+:	d8 fb                	fdivr  st,st\(3\)
+[ 	]*[a-f0-9]+:	de f1                	fdivrp st\(1\),st
+[ 	]*[a-f0-9]+:	de f3                	fdivrp st\(3\),st
+[ 	]*[a-f0-9]+:	de f3                	fdivrp st\(3\),st
+#pass

gas/testsuite/gas/i386/compat.d

@@ -8,18 +8,22 @@ Disassembly of section .text:
 
 0+ <.text>:
 [ 	]*[a-f0-9]+:	dc e3                	fsub   %st,%st\(3\)
+[ 	]*[a-f0-9]+:	d8 e3                	fsub   %st\(3\),%st
 [ 	]*[a-f0-9]+:	de e1                	fsubp  %st,%st\(1\)
 [ 	]*[a-f0-9]+:	de e3                	fsubp  %st,%st\(3\)
 [ 	]*[a-f0-9]+:	de e3                	fsubp  %st,%st\(3\)
 [ 	]*[a-f0-9]+:	dc eb                	fsubr  %st,%st\(3\)
+[ 	]*[a-f0-9]+:	d8 eb                	fsubr  %st\(3\),%st
 [ 	]*[a-f0-9]+:	de e9                	fsubrp %st,%st\(1\)
 [ 	]*[a-f0-9]+:	de eb                	fsubrp %st,%st\(3\)
 [ 	]*[a-f0-9]+:	de eb                	fsubrp %st,%st\(3\)
 [ 	]*[a-f0-9]+:	dc f3                	fdiv   %st,%st\(3\)
+[ 	]*[a-f0-9]+:	d8 f3                	fdiv   %st\(3\),%st
 [ 	]*[a-f0-9]+:	de f1                	fdivp  %st,%st\(1\)
 [ 	]*[a-f0-9]+:	de f3                	fdivp  %st,%st\(3\)
 [ 	]*[a-f0-9]+:	de f3                	fdivp  %st,%st\(3\)
 [ 	]*[a-f0-9]+:	dc fb                	fdivr  %st,%st\(3\)
+[ 	]*[a-f0-9]+:	d8 fb                	fdivr  %st\(3\),%st
 [ 	]*[a-f0-9]+:	de f9                	fdivrp %st,%st\(1\)
 [ 	]*[a-f0-9]+:	de fb                	fdivrp %st,%st\(3\)
 [ 	]*[a-f0-9]+:	de fb                	fdivrp %st,%st\(3\)

gas/testsuite/gas/i386/compat.s

@@ -1,18 +1,22 @@
 # Check SYSV mnemonic instructions.
 	.text 
 	fsub	%st,%st(3)
+	fsub	%st(3),%st
 	fsubp
 	fsubp	%st(3)
 	fsubp	%st,%st(3)
 	fsubr	%st,%st(3)
+	fsubr	%st(3),%st
 	fsubrp
 	fsubrp	%st(3)
 	fsubrp	%st,%st(3)
 	fdiv	%st,%st(3)
+	fdiv	%st(3),%st
 	fdivp
 	fdivp	%st(3)
 	fdivp	%st,%st(3)
 	fdivr	%st,%st(3)
+	fdivr	%st(3),%st
 	fdivrp
 	fdivrp	%st(3)
 	fdivrp	%st,%st(3)

gas/testsuite/gas/i386/i386.exp

@@ -178,6 +178,7 @@ if [gas_32_check] then {
     run_dump_test "i386-intel"
     run_dump_test "compat"
     run_dump_test "compat-intel"
+    run_dump_test "compat-intel2"
     run_dump_test "arch-1"
     run_dump_test "arch-2"
     run_dump_test "arch-3"