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[PATCH 2/17][Testsuite] Add a selector for ARM FP16 alternative format support.

From: Matthew Wahab <matthew dot wahab at foss dot arm dot com>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Tue, 17 May 2016 15:24:54 +0100
Subject: [PATCH 2/17][Testsuite] Add a selector for ARM FP16 alternative format support.
Authentication-results: sourceware.org; auth=none
References: <573B28A3 dot 9030603 at foss dot arm dot com>

The ARMv8.2-A FP16 extension only supports the IEEE format for FP16
data. It is not compatible with the option -mfp16-format=none nor with
the option -mfp16-format=alternative (selecting the ARM alternative FP16
format). Using either with the FP16 extension will trigger a compiler
error.

This patch adds the selector arm_fp16_alternative_ok to the testsuite's
target-support code to allow tests to require support for the
alternative format. It also adds selector arm_fp16_none_ok to check
whether -mfp16-format=none is a valid option for the target.  The patch
also updates existing tests to make use of the new selectors.

Tested the series for arm-none-linux-gnueabihf with native bootstrap and
make check and for arm-none-eabi and armeb-none-eabi with make check on an
ARMv8.2-A emulator.

Ok for trunk?
Matthew

2016-05-17  Matthew Wahab  <matthew.wahab@arm.com>

	* doc/sourcebuild.texi (ARM-specific attributes): Add entries for
	arm_fp16_alternative_ok and arm_fp16_none_ok.

testsuite/
2016-05-17  Matthew Wahab  <matthew.wahab@arm.com>

	* g++.dg/ext/arm-fp16/arm-fp16-ops-3.C: Use
	arm_fp16_alternative_ok.
	* g++.dg/ext/arm-fp16/arm-fp16-ops-4.C: Likewise.
	* gcc.dg/torture/arm-fp16-int-convert-alt.c: Likewise.
	* gcc/testsuite/gcc.dg/torture/arm-fp16-ops-3.c: Likewise.
	* gcc/testsuite/gcc.dg/torture/arm-fp16-ops-4.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-1.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-10.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-11.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-12.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-2.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-3.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-4.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-5.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-6.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-7.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-8.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-9.c: Likewise.
	* gcc.target/arm/fp16-compile-none-1.c: Use arm_fp16_none_ok.
	* gcc.target/arm/fp16-compile-none-2.c: Likewise.
	* gcc.target/arm/fp16-rounding-alt-1.c: Use
	arm_fp16_alternative_ok.
	* lib/target-supports.exp
	(check_effective_target_arm_fp16_alternative_ok_nocache): New.
	(check_effective_target_arm_fp16_alternative_ok): New.
	(check_effective_target_arm_fp16_none_ok_nocache): New.
	(check_effective_target_arm_fp16_none_ok): New.

>From 1901fdfbd2f8da9809a60e43284a1749b015dfba Mon Sep 17 00:00:00 2001
From: Matthew Wahab <matthew.wahab@arm.com>
Date: Thu, 7 Apr 2016 13:33:51 +0100
Subject: [PATCH 02/17] [PATCH 2/17][Testsuite] Add a selector for ARM FP16
 alternative format support.

2016-05-17  Matthew Wahab  <matthew.wahab@arm.com>

	* doc/sourcebuild.texi (ARM-specific attributes): Add entries for
	arm_fp16_alternative_ok and arm_fp16_none_ok.

testsuite/
2016-05-17  Matthew Wahab  <matthew.wahab@arm.com>

	* g++.dg/ext/arm-fp16/arm-fp16-ops-3.C: Use
	arm_fp16_alternative_ok.
	* g++.dg/ext/arm-fp16/arm-fp16-ops-4.C: Likewise.
	* gcc.dg/torture/arm-fp16-int-convert-alt.c: Likewise.
	* gcc/testsuite/gcc.dg/torture/arm-fp16-ops-3.c: Likewise.
	* gcc/testsuite/gcc.dg/torture/arm-fp16-ops-4.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-1.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-10.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-11.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-12.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-2.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-3.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-4.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-5.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-6.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-7.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-8.c: Likewise.
	* gcc.target/arm/fp16-compile-alt-9.c: Likewise.
	* gcc.target/arm/fp16-compile-none-1.c: Use arm_fp16_none_ok.
	* gcc.target/arm/fp16-compile-none-2.c: Likewise.
	* gcc.target/arm/fp16-rounding-alt-1.c: Use
	arm_fp16_alternative_ok.
	* lib/target-supports.exp
	(check_effective_target_arm_fp16_alternative_ok_nocache): New.
	(check_effective_target_arm_fp16_alternative_ok): New.
	(check_effective_target_arm_fp16_none_ok_nocache): New.
	(check_effective_target_arm_fp16_none_ok): New.
---
 gcc/doc/sourcebuild.texi                           |  7 +++
 gcc/testsuite/g++.dg/ext/arm-fp16/arm-fp16-ops-3.C |  1 +
 gcc/testsuite/g++.dg/ext/arm-fp16/arm-fp16-ops-4.C |  1 +
 .../gcc.dg/torture/arm-fp16-int-convert-alt.c      |  1 +
 gcc/testsuite/gcc.dg/torture/arm-fp16-ops-3.c      |  1 +
 gcc/testsuite/gcc.dg/torture/arm-fp16-ops-4.c      |  1 +
 gcc/testsuite/gcc.target/arm/fp16-compile-alt-1.c  |  1 +
 gcc/testsuite/gcc.target/arm/fp16-compile-alt-10.c |  1 +
 gcc/testsuite/gcc.target/arm/fp16-compile-alt-11.c |  1 +
 gcc/testsuite/gcc.target/arm/fp16-compile-alt-12.c |  1 +
 gcc/testsuite/gcc.target/arm/fp16-compile-alt-2.c  |  1 +
 gcc/testsuite/gcc.target/arm/fp16-compile-alt-3.c  |  1 +
 gcc/testsuite/gcc.target/arm/fp16-compile-alt-4.c  |  1 +
 gcc/testsuite/gcc.target/arm/fp16-compile-alt-5.c  |  1 +
 gcc/testsuite/gcc.target/arm/fp16-compile-alt-6.c  |  1 +
 gcc/testsuite/gcc.target/arm/fp16-compile-alt-7.c  |  1 +
 gcc/testsuite/gcc.target/arm/fp16-compile-alt-8.c  |  1 +
 gcc/testsuite/gcc.target/arm/fp16-compile-alt-9.c  |  1 +
 gcc/testsuite/gcc.target/arm/fp16-compile-none-1.c |  1 +
 gcc/testsuite/gcc.target/arm/fp16-compile-none-2.c |  1 +
 gcc/testsuite/gcc.target/arm/fp16-rounding-alt-1.c |  1 +
 gcc/testsuite/lib/target-supports.exp              | 59 ++++++++++++++++++++++
 22 files changed, 86 insertions(+)

diff --git a/gcc/doc/sourcebuild.texi b/gcc/doc/sourcebuild.texi
index 3142cd5..dd6abda 100644
--- a/gcc/doc/sourcebuild.texi
+++ b/gcc/doc/sourcebuild.texi
@@ -1565,6 +1565,13 @@ options, including @code{-mfp16-format=ieee} if necessary to obtain the
 Test system supports executing Neon half-precision float instructions.
 (Implies previous.)
 
+@item arm_fp16_alternative_ok
+ARM target supports the ARM FP16 alternative format.  Some multilibs
+may be incompatible with the options needed.
+
+@item arm_fp16_none_ok
+ARM target supports specifying none as the ARM FP16 format.
+
 @item arm_thumb1_ok
 ARM target generates Thumb-1 code for @code{-mthumb}.
 
diff --git a/gcc/testsuite/g++.dg/ext/arm-fp16/arm-fp16-ops-3.C b/gcc/testsuite/g++.dg/ext/arm-fp16/arm-fp16-ops-3.C
index 8f9ab64..29080c7 100644
--- a/gcc/testsuite/g++.dg/ext/arm-fp16/arm-fp16-ops-3.C
+++ b/gcc/testsuite/g++.dg/ext/arm-fp16/arm-fp16-ops-3.C
@@ -1,5 +1,6 @@
 /* Test various operators on __fp16 and mixed __fp16/float operands.  */
 /* { dg-do run { target arm*-*-* } } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative" } */
 
 #include "arm-fp16-ops.h"
diff --git a/gcc/testsuite/g++.dg/ext/arm-fp16/arm-fp16-ops-4.C b/gcc/testsuite/g++.dg/ext/arm-fp16/arm-fp16-ops-4.C
index 4877f39..4be8883 100644
--- a/gcc/testsuite/g++.dg/ext/arm-fp16/arm-fp16-ops-4.C
+++ b/gcc/testsuite/g++.dg/ext/arm-fp16/arm-fp16-ops-4.C
@@ -1,5 +1,6 @@
 /* Test various operators on __fp16 and mixed __fp16/float operands.  */
 /* { dg-do run { target arm*-*-* } } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative -ffast-math" } */
 
 #include "arm-fp16-ops.h"
diff --git a/gcc/testsuite/gcc.dg/torture/arm-fp16-int-convert-alt.c b/gcc/testsuite/gcc.dg/torture/arm-fp16-int-convert-alt.c
index bcd7aef..7eb73e6 100644
--- a/gcc/testsuite/gcc.dg/torture/arm-fp16-int-convert-alt.c
+++ b/gcc/testsuite/gcc.dg/torture/arm-fp16-int-convert-alt.c
@@ -1,5 +1,6 @@
 /* Test floating-point conversions.  Standard types and __fp16.  */
 /* { dg-do run { target arm*-*-* } } */
+/* { dg-require-effective-target arm_fp16_alternative_ok }
 /* { dg-options "-mfp16-format=alternative" } */
 
 #include "fp-int-convert.h"
diff --git a/gcc/testsuite/gcc.dg/torture/arm-fp16-ops-3.c b/gcc/testsuite/gcc.dg/torture/arm-fp16-ops-3.c
index 8f9ab64..7716baf 100644
--- a/gcc/testsuite/gcc.dg/torture/arm-fp16-ops-3.c
+++ b/gcc/testsuite/gcc.dg/torture/arm-fp16-ops-3.c
@@ -1,5 +1,6 @@
 /* Test various operators on __fp16 and mixed __fp16/float operands.  */
 /* { dg-do run { target arm*-*-* } } */
+/* { dg-require-effective-target arm_fp16_alternative_ok }
 /* { dg-options "-mfp16-format=alternative" } */
 
 #include "arm-fp16-ops.h"
diff --git a/gcc/testsuite/gcc.dg/torture/arm-fp16-ops-4.c b/gcc/testsuite/gcc.dg/torture/arm-fp16-ops-4.c
index 4877f39..1940f43 100644
--- a/gcc/testsuite/gcc.dg/torture/arm-fp16-ops-4.c
+++ b/gcc/testsuite/gcc.dg/torture/arm-fp16-ops-4.c
@@ -1,5 +1,6 @@
 /* Test various operators on __fp16 and mixed __fp16/float operands.  */
 /* { dg-do run { target arm*-*-* } } */
+/* { dg-require-effective-target arm_fp16_alternative_ok }
 /* { dg-options "-mfp16-format=alternative -ffast-math" } */
 
 #include "arm-fp16-ops.h"
diff --git a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-1.c b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-1.c
index 3abcd94..0845e88 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-1.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-1.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative" } */
 
 __fp16 xx = 0.0;
diff --git a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-10.c b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-10.c
index 2e3d31f..a8772a1 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-10.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-10.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative -pedantic -std=gnu99" } */
 
 #include <math.h>
diff --git a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-11.c b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-11.c
index 62a7a3d..1cb3d2c 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-11.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-11.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative -pedantic -std=gnu99" } */
 
 #include <math.h>
diff --git a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-12.c b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-12.c
index 09586e9..3c3bd2f 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-12.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-12.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative" } */
 
 float xx __attribute__((mode(HF))) = 0.0;
diff --git a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-2.c b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-2.c
index b7fe99d..8a45f1f 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-2.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-2.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative" } */
 
 /* Encoding taken from:  http://en.wikipedia.org/wiki/Half_precision */
diff --git a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-3.c b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-3.c
index f325a84..e786a51 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-3.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-3.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative" } */
 
 /* Encoding taken from:  http://en.wikipedia.org/wiki/Half_precision */
diff --git a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-4.c b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-4.c
index 4b9b331..cfeb61a 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-4.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-4.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative" } */
 
 /* Encoding taken from:  http://en.wikipedia.org/wiki/Half_precision */
diff --git a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-5.c b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-5.c
index 458f507..3b741ae 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-5.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-5.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative" } */
 
 /* Encoding taken from:  http://en.wikipedia.org/wiki/Half_precision */
diff --git a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-6.c b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-6.c
index dbb4a99..abffff5 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-6.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-6.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative" } */
 
 /* This number is the maximum value representable in the alternative
diff --git a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-7.c b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-7.c
index 40940a6..c339f19 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-7.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-7.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative -pedantic" } */
 
 /* This number overflows the range of the alternative encoding.  Since this
diff --git a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-8.c b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-8.c
index cbc0a39..deeb5cd 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-8.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-8.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative" } */
 
 /* Encoding taken from:  http://en.wikipedia.org/wiki/Half_precision */
diff --git a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-9.c b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-9.c
index 6487c8d..f9f5654 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-compile-alt-9.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-compile-alt-9.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative" } */
 
 /* Encoding taken from:  http://en.wikipedia.org/wiki/Half_precision */
diff --git a/gcc/testsuite/gcc.target/arm/fp16-compile-none-1.c b/gcc/testsuite/gcc.target/arm/fp16-compile-none-1.c
index e912505..9472249 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-compile-none-1.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-compile-none-1.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_fp16_none_ok } */
 /* { dg-options "-mfp16-format=none" } */
 
 /* __fp16 type name is not recognized unless you explicitly enable it
diff --git a/gcc/testsuite/gcc.target/arm/fp16-compile-none-2.c b/gcc/testsuite/gcc.target/arm/fp16-compile-none-2.c
index eb7eef5..9ec21e5 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-compile-none-2.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-compile-none-2.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target arm_fp16_none_ok } */
 /* { dg-options "-mfp16-format=none" } */
 
 /* mode(HF) attributes are not recognized unless you explicitly enable
diff --git a/gcc/testsuite/gcc.target/arm/fp16-rounding-alt-1.c b/gcc/testsuite/gcc.target/arm/fp16-rounding-alt-1.c
index f50b447..1c15b61 100644
--- a/gcc/testsuite/gcc.target/arm/fp16-rounding-alt-1.c
+++ b/gcc/testsuite/gcc.target/arm/fp16-rounding-alt-1.c
@@ -3,6 +3,7 @@
    from double to __fp16.  */
 
 /* { dg-do run } */
+/* { dg-require-effective-target arm_fp16_alternative_ok } */
 /* { dg-options "-mfp16-format=alternative" } */
 
 #include <stdlib.h>
diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 04ca176..ed89a3b 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -3043,6 +3043,65 @@ proc add_options_for_arm_neon_fp16 { flags } {
     return "$flags $et_arm_neon_fp16_flags"
 }
 
+# Return 1 if this is an ARM target supporting the FP16 alternative
+# format.  Some multilibs may be incompatible with the options needed.  Also
+# set et_arm_neon_fp16_flags to the best options to add.
+
+proc check_effective_target_arm_fp16_alternative_ok_nocache { } {
+    global et_arm_neon_fp16_flags
+    set et_arm_neon_fp16_flags ""
+    if { [check_effective_target_arm32] } {
+	foreach flags {"" "-mfloat-abi=softfp" "-mfpu=neon-fp16"
+		       "-mfpu=neon-fp16 -mfloat-abi=softfp"} {
+	    if { [check_no_compiler_messages_nocache \
+		      arm_fp16_alternative_ok object {
+		#if !defined (__ARM_FP16_FORMAT_ALTERNATIVE)
+		#error __ARM_FP16_FORMAT_ALTERNATIVE not defined
+		#endif
+	    } "$flags -mfp16-format=alternative"] } {
+		set et_arm_neon_fp16_flags "$flags -mfp16-format=alternative"
+		return 1
+	    }
+	}
+    }
+
+    return 0
+}
+
+proc check_effective_target_arm_fp16_alternative_ok { } {
+    return [check_cached_effective_target arm_fp16_alternative_ok \
+		check_effective_target_arm_fp16_alternative_ok_nocache]
+}
+
+# Return 1 if this is an ARM target supports specifying the FP16 none
+# format.  Some multilibs may be incompatible with the options needed.
+
+proc check_effective_target_arm_fp16_none_ok_nocache { } {
+    if { [check_effective_target_arm32] } {
+	foreach flags {"" "-mfloat-abi=softfp" "-mfpu=neon-fp16"
+		       "-mfpu=neon-fp16 -mfloat-abi=softfp"} {
+	    if { [check_no_compiler_messages_nocache \
+		      arm_fp16_none_ok object {
+		#if defined (__ARM_FP16_FORMAT_ALTERNATIVE)
+		#error __ARM_FP16_FORMAT_ALTERNATIVE defined
+		#endif
+		#if defined (__ARM_FP16_FORMAT_IEEE)
+		#error __ARM_FP16_FORMAT_IEEE defined
+		#endif
+	    } "$flags -mfp16-format=none"] } {
+		return 1
+	    }
+	}
+    }
+
+    return 0
+}
+
+proc check_effective_target_arm_fp16_none_ok { } {
+    return [check_cached_effective_target arm_fp16_none_ok \
+		check_effective_target_arm_fp16_none_ok_nocache]
+}
+
 # Return 1 if this is an ARM target supporting -mfpu=neon-fp-armv8
 # -mfloat-abi=softfp or equivalent options.  Some multilibs may be
 # incompatible with these options.  Also set et_arm_v8_neon_flags to the
-- 
2.1.4

References:
- [PATCH 0/17][ARM] ARMv8.2-A and FP16 extension support.
  - From: Matthew Wahab

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