[PATCH v2] x86: SKINIT with operand needs IgnoreSize

[Jan Beulich]

Without it in 16-bit mode a pointless operand size prefix would be
emitted.
---
v2: Clone new testcase.

--- a/gas/testsuite/gas/i386/i386.exp
+++ b/gas/testsuite/gas/i386/i386.exp
@@ -109,6 +109,7 @@ if [gas_32_check] then {
     run_list_test "cr-err" ""
     run_dump_test "cdr"
     run_dump_test "svme"
+    run_dump_test "svme16"
     run_dump_test "amdfam10"
     run_dump_test "ssse3"
     run_dump_test "rep"
--- a/gas/testsuite/gas/i386/svme.s
+++ b/gas/testsuite/gas/i386/svme.s
@@ -1,4 +1,7 @@
 	.text
+.ifdef __ia16__
+	.code16
+.endif
 common:
 	clgi
 	invlpga
--- /dev/null
+++ b/gas/testsuite/gas/i386/svme16.d
@@ -0,0 +1,41 @@
+#as: --defsym __ia16__=1
+#objdump: -dw -Mi8086
+#name: 16-bit SVME
+#source: svme.s
+
+.*: +file format .*
+
+Disassembly of section .text:
+
+0+000 <common>:
+[	 ]*[0-9a-f]+:[	 ]+0f 01 dd[	 ]+clgi
+[	 ]*[0-9a-f]+:[	 ]+0f 01 df[	 ]+invlpga
+[	 ]*[0-9a-f]+:[	 ]+0f 01 de[	 ]+skinit
+[	 ]*[0-9a-f]+:[	 ]+0f 01 dc[	 ]+stgi
+[	 ]*[0-9a-f]+:[	 ]+0f 01 da[	 ]+vmload
+[	 ]*[0-9a-f]+:[	 ]+0f 01 d9[	 ]+vmmcall
+[	 ]*[0-9a-f]+:[	 ]+0f 01 d8[	 ]+vmrun
+[	 ]*[0-9a-f]+:[	 ]+0f 01 db[	 ]+vmsave
+[0-9a-f]+ <att32>:
+[	 ]*[0-9a-f]+:[	 ]+0f 01 de[	 ]+skinit
+[	 ]*[0-9a-f]+:[	 ]+67 0f 01 df[	 ]+addr32 invlpga
+[	 ]*[0-9a-f]+:[	 ]+67 0f 01 da[	 ]+addr32 vmload
+[	 ]*[0-9a-f]+:[	 ]+67 0f 01 d8[	 ]+addr32 vmrun
+[	 ]*[0-9a-f]+:[	 ]+67 0f 01 db[	 ]+addr32 vmsave
+[0-9a-f]+ <att16>:
+[	 ]*[0-9a-f]+:[	 ]+0f 01 df[	 ]+invlpga
+[	 ]*[0-9a-f]+:[	 ]+0f 01 da[	 ]+vmload
+[	 ]*[0-9a-f]+:[	 ]+0f 01 d8[	 ]+vmrun
+[	 ]*[0-9a-f]+:[	 ]+0f 01 db[	 ]+vmsave
+[0-9a-f]+ <intel32>:
+[	 ]*[0-9a-f]+:[	 ]+0f 01 de[	 ]+skinit
+[	 ]*[0-9a-f]+:[	 ]+67 0f 01 df[	 ]+addr32 invlpga
+[	 ]*[0-9a-f]+:[	 ]+67 0f 01 da[	 ]+addr32 vmload
+[	 ]*[0-9a-f]+:[	 ]+67 0f 01 d8[	 ]+addr32 vmrun
+[	 ]*[0-9a-f]+:[	 ]+67 0f 01 db[	 ]+addr32 vmsave
+[0-9a-f]+ <intel16>:
+[	 ]*[0-9a-f]+:[	 ]+0f 01 df[	 ]+invlpga
+[	 ]*[0-9a-f]+:[	 ]+0f 01 da[	 ]+vmload
+[	 ]*[0-9a-f]+:[	 ]+0f 01 d8[	 ]+vmrun
+[	 ]*[0-9a-f]+:[	 ]+0f 01 db[	 ]+vmsave
+#pass
--- a/opcodes/i386-opc.tbl
+++ b/opcodes/i386-opc.tbl
@@ -2068,7 +2068,7 @@ clgi, 0xf01dd, None, CpuSVME, No_bSuf|No
 invlpga, 0xf01df, None, CpuSVME, No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf, {}
 invlpga, 0xf01df, None, CpuSVME, AddrPrefixOpReg, { Acc|Word|Dword|Qword, RegC|Dword }
 skinit, 0xf01de, None, CpuSVME, No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf, {}
-skinit, 0xf01de, None, CpuSVME, No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf, { Acc|Dword }
+skinit, 0xf01de, None, CpuSVME, No_bSuf|IgnoreSize|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf, { Acc|Dword }
 stgi, 0xf01dc, None, CpuSVME, No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf, {}
 vmgexit, 0xf30f01d9, None, CpuSEV_ES, No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf, {}
 vmload, 0xf01da, None, CpuSVME, No_bSuf|No_wSuf|No_lSuf|No_sSuf|No_qSuf|No_ldSuf, {}