Use ud2 assembly mnemonic when available.

gcc/
	* configure.ac (HAVE_AS_IX86_UD2): New test for 'ud2' mnemonic.
	* configure: Regenerated.
	* config.in: Regenerated.
	* config/i386/i386.md (trap) [HAVE_AS_IX86_UD2]: Use the mnemonic
	instead of ASM_SHORT.

From-SVN: r207789

5 files changed, 58 insertions, 1 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index eef35b4..dd988ce 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2014-02-14  Roland McGrath  <mcgrathr@google.com>
+
+	* configure.ac (HAVE_AS_IX86_UD2): New test for 'ud2' mnemonic.
+	* configure: Regenerated.
+	* config.in: Regenerated.
+	* config/i386/i386.md (trap) [HAVE_AS_IX86_UD2]: Use the mnemonic
+	instead of ASM_SHORT.
+
 2014-02-14  Vladimir Makarov  <vmakarov@redhat.com>
 	    Richard Earnshaw  <rearnsha@arm.com>
 
diff --git a/gcc/config.in b/gcc/config.in
index 3aefa06..5aa3221 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -375,6 +375,12 @@
 #endif
 
 
+/* Define if your assembler supports the 'ud2' mnemonic. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_AS_IX86_UD2
+#endif
+
+
 /* Define if your assembler supports the lituse_jsrdirect relocation. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_AS_JSRDIRECT_RELOCS
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 05fc00a..232a334 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -17843,7 +17843,13 @@
 (define_insn "trap"
   [(trap_if (const_int 1) (const_int 6))]
   ""
-  { return ASM_SHORT "0x0b0f"; }
+{
+#ifdef HAVE_AS_IX86_UD2
+  return "ud2";
+#else
+  return ASM_SHORT "0x0b0f";
+#endif
+}
   [(set_attr "length" "2")])
 
 (define_expand "prefetch"
diff --git a/gcc/configure b/gcc/configure
index 3ecd194..cab3e92 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -25109,6 +25109,37 @@ $as_echo "#define HAVE_AS_IX86_REP_LOCK_PREFIX 1" >>confdefs.h
 
 fi
 
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for ud2 mnemonic" >&5
+$as_echo_n "checking assembler for ud2 mnemonic... " >&6; }
+if test "${gcc_cv_as_ix86_ud2+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  gcc_cv_as_ix86_ud2=no
+  if test x$gcc_cv_as != x; then
+    $as_echo 'ud2' > conftest.s
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags  -o conftest.o conftest.s >&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+    then
+	gcc_cv_as_ix86_ud2=yes
+    else
+      echo "configure: failed program was" >&5
+      cat conftest.s >&5
+    fi
+    rm -f conftest.o conftest.s
+  fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_as_ix86_ud2" >&5
+$as_echo "$gcc_cv_as_ix86_ud2" >&6; }
+if test $gcc_cv_as_ix86_ud2 = yes; then
+
+$as_echo "#define HAVE_AS_IX86_UD2 1" >>confdefs.h
+
+fi
+
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for R_386_TLS_GD_PLT reloc" >&5
 $as_echo_n "checking assembler for R_386_TLS_GD_PLT reloc... " >&6; }
 if test "${gcc_cv_as_ix86_tlsgdplt+set}" = set; then :
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 402494e..969a8a6 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -3895,6 +3895,12 @@ foo:	nop
         [AC_DEFINE(HAVE_AS_IX86_REP_LOCK_PREFIX, 1,
           [Define if the assembler supports 'rep <insn>, lock <insn>'.])])
 
+    gcc_GAS_CHECK_FEATURE([ud2 mnemonic],
+	gcc_cv_as_ix86_ud2,,,
+	[ud2],,
+      [AC_DEFINE(HAVE_AS_IX86_UD2, 1,
+	[Define if your assembler supports the 'ud2' mnemonic.])])
+
     gcc_GAS_CHECK_FEATURE([R_386_TLS_GD_PLT reloc],
         gcc_cv_as_ix86_tlsgdplt,,,
 	[call    tls_gd@tlsgdplt],