[PATCH 4/17][ARM] Define feature macros for FP16.

2016-09-23  Matthew Wahab  <matthew.wahab@arm.com>

	* config/arm/arm-c.c (arm_cpu_builtins): Define
	"__ARM_FEATURE_FP16_SCALAR_ARITHMETIC" and
	"__ARM_FEATURE_FP16_VECTOR_ARITHMETIC".

testsuite/
2016-09-23  Matthew Wahab  <matthew.wahab@arm.com>

	* gcc.target/arm/attr-fp16-arith-1.c: New.

From-SVN: r240402

gcc/ChangeLog

 2016-09-23  Matthew Wahab  <matthew.wahab@arm.com>
 
+	* config/arm/arm-c.c (arm_cpu_builtins): Define
+	"__ARM_FEATURE_FP16_SCALAR_ARITHMETIC" and
+	"__ARM_FEATURE_FP16_VECTOR_ARITHMETIC".
+
+2016-09-23  Matthew Wahab  <matthew.wahab@arm.com>
+
 	* doc/sourcebuild.texi (ARM-specific attributes): Add anchor for
 	arm_v8_1a_neon_ok.  Add entries for arm_v8_2a_fp16_scalar_ok,
 	arm_v8_2a_fp16_scalar_hw, arm_v8_2a_fp16_neon_ok and

gcc/config/arm/arm-c.c

@@ -142,6 +142,11 @@ arm_cpu_builtins (struct cpp_reader* pfile)
   def_or_undef_macro (pfile, "__ARM_FP16_ARGS",
 		      arm_fp16_format != ARM_FP16_FORMAT_NONE);
 
+  def_or_undef_macro (pfile, "__ARM_FEATURE_FP16_SCALAR_ARITHMETIC",
+		      TARGET_VFP_FP16INST);
+  def_or_undef_macro (pfile, "__ARM_FEATURE_FP16_VECTOR_ARITHMETIC",
+		      TARGET_NEON_FP16INST);
+
   def_or_undef_macro (pfile, "__ARM_FEATURE_FMA", TARGET_FMA);
   def_or_undef_macro (pfile, "__ARM_NEON__", TARGET_NEON);
   def_or_undef_macro (pfile, "__ARM_NEON", TARGET_NEON);

gcc/testsuite/ChangeLog

 2016-09-23  Matthew Wahab  <matthew.wahab@arm.com>
 
+	* gcc.target/arm/attr-fp16-arith-1.c: New.
+
+2016-09-23  Matthew Wahab  <matthew.wahab@arm.com>
+
 	* lib/target-supports.exp (add_options_for_arm_v8_2a_fp16_scalar):
 	New.
 	(add_options_for_arm_v8_2a_fp16_neon): New.

gcc/testsuite/gcc.target/arm/attr-fp16-arith-1.c

+/* { dg-do compile } */
+/* { dg-require-effective-target arm_v8_2a_fp16_neon_ok } */
+/* { dg-options "-O2" } */
+/* { dg-add-options arm_v8_2a_fp16_scalar } */
+
+/* Reset fpu to a value compatible with the next pragmas.  */
+#pragma GCC target ("fpu=vfp")
+
+#pragma GCC push_options
+#pragma GCC target ("fpu=fp-armv8")
+
+#ifndef __ARM_FEATURE_FP16_SCALAR_ARITHMETIC
+#error __ARM_FEATURE_FP16_SCALAR_ARITHMETIC not defined.
+#endif
+
+#pragma GCC push_options
+#pragma GCC target ("fpu=neon-fp-armv8")
+
+#ifndef __ARM_FEATURE_FP16_VECTOR_ARITHMETIC
+#error __ARM_FEATURE_FP16_VECTOR_ARITHMETIC not defined.
+#endif
+
+#ifndef __ARM_NEON
+#error __ARM_NEON not defined.
+#endif
+
+#if !defined (__ARM_FP) || !(__ARM_FP & 0x2)
+#error Invalid value for __ARM_FP
+#endif
+
+#pragma GCC pop_options
+
+/* Check that the FP version is correctly reset to mfpu=fp-armv8.  */
+
+#if !defined (__ARM_FP) || !(__ARM_FP & 0x2)
+#error __ARM_FP should record FP16 support.
+#endif
+
+#pragma GCC pop_options
+
+/* Check that the FP version is correctly reset to mfpu=vfp.  */
+
+#if !defined (__ARM_FP) || (__ARM_FP & 0x2)
+#error Unexpected value for __ARM_FP.
+#endif