x86: adjust ignored prefix warning for branches

There's no reason to not also issue them in Intel syntax mode, and it
can be quite helpful to mention the actual insn (after all there can be
multiple on a single line).

5 files changed, 27 insertions, 14 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 286f018..dc028c9 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,5 +1,14 @@
 2019-12-27  Jan Beulich  <jbeulich@suse.com>
 
+	* config/tc-i386.c (output_branch, output_jump,
+	output_interseg_jump): Also emit skipped prefix warning in Intel
+	syntax mode. Name instruction in the warning text.
+	* testsuite/gas/i386/mpx-inval-1.l,
+	testsuite/gas/i386/notrackbad.l,
+	testsuite/gas/i386/x86-64-notrackbad.l: Adjust expectations.
+
+2019-12-27  Jan Beulich  <jbeulich@suse.com>
+
 	* config/tc-i386.c (output_branch): Handle BND prefix the same
 	way as other prefixes. Emit it last before REX.
 	(output_jump): Emit BND before REX.
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index 8e89b00..a78aaba 100644
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -7914,8 +7914,8 @@ output_branch (void)
       i.prefixes--;
     }
 
-  if (i.prefixes != 0 && !intel_syntax)
-    as_warn (_("skipping prefixes on this instruction"));
+  if (i.prefixes != 0)
+    as_warn (_("skipping prefixes on `%s'"), i.tm.name);
 
   /* It's always a symbol;  End frag & setup for relax.
      Make sure there is enough room in this frag for the largest
@@ -8057,8 +8057,8 @@ output_jump (void)
       i.prefixes -= 1;
     }
 
-  if (i.prefixes != 0 && !intel_syntax)
-    as_warn (_("skipping prefixes on this instruction"));
+  if (i.prefixes != 0)
+    as_warn (_("skipping prefixes on `%s'"), i.tm.name);
 
   p = frag_more (i.tm.opcode_length + size);
   switch (i.tm.opcode_length)
@@ -8118,8 +8118,8 @@ output_interseg_jump (void)
   if (code16)
     size = 2;
 
-  if (i.prefixes != 0 && !intel_syntax)
-    as_warn (_("skipping prefixes on this instruction"));
+  if (i.prefixes != 0)
+    as_warn (_("skipping prefixes on `%s'"), i.tm.name);
 
   /* 1 opcode; 2 segment; offset  */
   p = frag_more (prefix + 1 + 2 + size);
diff --git a/gas/testsuite/gas/i386/mpx-inval-1.l b/gas/testsuite/gas/i386/mpx-inval-1.l
index b356080..f50fd7f 100644
--- a/gas/testsuite/gas/i386/mpx-inval-1.l
+++ b/gas/testsuite/gas/i386/mpx-inval-1.l
@@ -2,15 +2,17 @@
 .*:6: Error: expecting valid branch instruction after `bnd'
 .*:7: Error: expecting valid branch instruction after `bnd'
 .*:8: Error: expecting valid branch instruction after `bnd'
-.*:8: Warning: skipping prefixes on this instruction
+.*:8: Warning: skipping prefixes on `lcall'
 .*:9: Error: expecting valid branch instruction after `bnd'
-.*:9: Warning: skipping prefixes on this instruction
+.*:9: Warning: skipping prefixes on `ljmp'
 .*:10: Error: expecting valid branch instruction after `bnd'
 .*:11: Error: expecting valid branch instruction after `bnd'
 .*:14: Error: expecting valid branch instruction after `bnd'
 .*:15: Error: expecting valid branch instruction after `bnd'
 .*:16: Error: expecting valid branch instruction after `bnd'
+.*:16: Warning: skipping prefixes on `lcall'
 .*:17: Error: expecting valid branch instruction after `bnd'
+.*:17: Warning: skipping prefixes on `ljmp'
 .*:18: Error: expecting valid branch instruction after `bnd'
 .*:19: Error: expecting valid branch instruction after `bnd'
 GAS LISTING .*
@@ -27,11 +29,11 @@ GAS LISTING .*
 .*  Error: expecting valid branch instruction after `bnd'
 [ 	]*8[ 	]+\?\?\?\? 9A000000 		bnd lcall \$0x1234,\$xxx
 .*  Error: expecting valid branch instruction after `bnd'
-.*  Warning: skipping prefixes on this instruction
+.*  Warning: skipping prefixes on `lcall'
 [ 	]*8[ 	]+003412
 [ 	]*9[ 	]+\?\?\?\? EA000000 		bnd ljmp \$0x1234,\$xxx
 .*  Error: expecting valid branch instruction after `bnd'
-.*  Warning: skipping prefixes on this instruction
+.*  Warning: skipping prefixes on `ljmp'
 [ 	]*9[ 	]+003412
 [ 	]*10[ 	]+\?\?\?\? F2E2E9   		bnd loop foo
 .*  Error: expecting valid branch instruction after `bnd'
@@ -45,9 +47,11 @@ GAS LISTING .*
 .*  Error: expecting valid branch instruction after `bnd'
 [ 	]*16[ 	]+\?\?\?\? 9A000000 		bnd lcall 0x1234,xxx
 .*  Error: expecting valid branch instruction after `bnd'
+.*  Warning: skipping prefixes on `lcall'
 [ 	]*16[ 	]+003412
 [ 	]*17[ 	]+\?\?\?\? EA000000 		bnd ljmp 0x1234,xxx
 .*  Error: expecting valid branch instruction after `bnd'
+.*  Warning: skipping prefixes on `ljmp'
 [ 	]*17[ 	]+003412
 [ 	]*18[ 	]+\?\?\?\? F2E2CE   		bnd loop foo
 .*  Error: expecting valid branch instruction after `bnd'
diff --git a/gas/testsuite/gas/i386/notrackbad.l b/gas/testsuite/gas/i386/notrackbad.l
index 2271a92..75d5553 100644
--- a/gas/testsuite/gas/i386/notrackbad.l
+++ b/gas/testsuite/gas/i386/notrackbad.l
@@ -1,6 +1,6 @@
 .*: Assembler messages:
 .*:6: Error: expecting indirect branch instruction after `notrack'
-.*:6: Warning: skipping prefixes on this instruction
+.*:6: Warning: skipping prefixes on `call'
 .*:7: Error: expecting indirect branch instruction after `notrack'
 .*:9: Error: same type of prefix used twice
 .*:10: Error: same type of prefix used twice
@@ -16,7 +16,7 @@ GAS LISTING .*
 [ 	]*5[ 	]+_start:
 [ 	]*6[ 	]+\?\?\?\? [0-9A-F]* 		notrack call foo
 \*\*\*\*  Error: expecting indirect branch instruction after `notrack'
-\*\*\*\*  Warning: skipping prefixes on this instruction
+\*\*\*\*  Warning: skipping prefixes on `call'
 [ 	]*6[ 	]+[0-9A-F]*
 [ 	]*7[ 	]+\?\?\?\? [0-9A-F]* 		notrack jmp foo
 \*\*\*\*  Error: expecting indirect branch instruction after `notrack'
diff --git a/gas/testsuite/gas/i386/x86-64-notrackbad.l b/gas/testsuite/gas/i386/x86-64-notrackbad.l
index 95a0f91..173b3d1 100644
--- a/gas/testsuite/gas/i386/x86-64-notrackbad.l
+++ b/gas/testsuite/gas/i386/x86-64-notrackbad.l
@@ -1,6 +1,6 @@
 .*: Assembler messages:
 .*:6: Error: expecting indirect branch instruction after `notrack'
-.*:6: Warning: skipping prefixes on this instruction
+.*:6: Warning: skipping prefixes on `call'
 .*:7: Error: expecting indirect branch instruction after `notrack'
 .*:9: Error: same type of prefix used twice
 .*:10: Error: same type of prefix used twice
@@ -16,7 +16,7 @@ GAS LISTING .*
 [ 	]*5[ 	]+_start:
 [ 	]*6[ 	]+\?\?\?\? [0-9A-F]* 		notrack call foo
 \*\*\*\*  Error: expecting indirect branch instruction after `notrack'
-\*\*\*\*  Warning: skipping prefixes on this instruction
+\*\*\*\*  Warning: skipping prefixes on `call'
 [ 	]*6[ 	]+[0-9A-F]*
 [ 	]*7[ 	]+\?\?\?\? [0-9A-F]* 		notrack jmp foo
 \*\*\*\*  Error: expecting indirect branch instruction after `notrack'