sourcebuild.texi: Document arm_v8_neon_ok.

2012-12-06  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

	gcc/
	* doc/sourcebuild.texi: Document arm_v8_neon_ok.

	gcc/testsuite/
	* lib/target-supports.exp (check_effective_target_arm_v8_neon_ok):
	New procedure.
	(add_options_for_arm_v8_neon): Likewise.

From-SVN: r194245

gcc/ChangeLog

 2012-12-06  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
+	* doc/sourcebuild.texi: Document arm_v8_neon_ok.
+
+2012-12-06  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
 	* config/arm/arm.c (neon_itype): Define NEON_RINT enum element.
 	(neon_builtin_data): Register vrintn, vrinta, vrintp, vrintm,
 	vrintz,	vrintx neon builtins.

gcc/doc/sourcebuild.texi

@@ -1560,6 +1560,10 @@ Some multilibs may be incompatible with these options.
 ARM target supports @code{-mfpu=fp-armv8 -mfloat-abi=softfp}.
 Some multilibs may be incompatible with these options.
 
+@item arm_v8_neon_ok
+ARM target supports @code{-mfpu=neon-fp-armv8 -mfloat-abi=softfp}.
+Some multilibs may be incompatible with these options.
+
 @item arm_prefer_ldrd_strd
 ARM target prefers @code{LDRD} and @code{STRD} instructions over
 @code{LDM} and @code{STM} instructions.

gcc/testsuite/ChangeLog

+2012-12-06  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	* lib/target-supports.exp (check_effective_target_arm_v8_neon_ok):
+	New procedure.
+	(add_options_for_arm_v8_neon): Likewise.
+
 2012-12-05  Steven Bosscher  <steven@gcc.gnu.org>
 
 	* g++.dg/pr55604.C: New test.

gcc/testsuite/lib/target-supports.exp

@@ -2107,6 +2107,22 @@ proc check_effective_target_arm_v8_vfp_ok {} {
     }
 }
 
+# Return 1 if this is an ARM target supporting -mfpu=neon-fp-armv8
+# -mfloat-abi=softfp
+proc check_effective_target_arm_v8_neon_ok {} {
+    if { [check_effective_target_arm32] } {
+	return [check_no_compiler_messages arm_v8_neon_ok object {
+	  int foo (void)
+	  {
+	     __asm__ volatile ("vrintn.f32 q0, q0");
+	       return 0;
+	  }
+	} "-mfpu=neon-fp-armv8 -mfloat-abi=softfp"]
+    } else {
+	return 0
+    }
+}
+
 # Return 1 if this is an ARM target supporting -mfpu=vfp
 # -mfloat-abi=hard.  Some multilibs may be incompatible with these
 # options.
@@ -2166,6 +2182,13 @@ proc add_options_for_arm_v8_vfp { flags } {
     return "$flags -mfpu=fp-armv8 -mfloat-abi=softfp"
 }
 
+proc add_options_for_arm_v8_neon { flags } {
+    if { ! [check_effective_target_arm_v8_neon_ok] } {
+        return "$flags"
+    }
+    return "$flags -mfpu=neon-fp-armv8 -mfloat-abi=softfp"
+}
+
 # Add the options needed for NEON.  We need either -mfloat-abi=softfp
 # or -mfloat-abi=hard, but if one is already specified by the
 # multilib, use it.  Similarly, if a -mfpu option already enables