The FP16 extension introduced with the ARMv8.2-A architecture adds
instructions operating on FP16 values to the VFP and NEON instruction
sets.
The patch adds the feature macro __ARM_FEATURE_FP16_SCALAR_ARITHMETIC
which is defined to be 1 if the VFP FP16 instructions are available; it
is otherwise undefined.
The patch also adds the feature macro __ARM_FEATURE_FP16_VECTOR_ARITHMETIC
which is defined to be 1 if the NEON FP16 instructions are available; it
is otherwise undefined.
These two macros will appear in a future version of the ACLE.
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.wa...@arm.com>
* config/arm/arm-c.c (arm_cpu_builtins): Define
"__ARM_FEATURE_FP16_SCALAR_ARITHMETIC" and
"__ARM_FEATURE_FP16_VECTOR_ARITHMETIC".
testsuite/
2016-05-17 Matthew Wahab <matthew.wa...@arm.com>
* gcc.target/arm/attr-fp16-arith-1.c: New.
>From 688b4d34a64a40abd4705a9bdaea40929a7a1d26 Mon Sep 17 00:00:00 2001
From: Matthew Wahab <matthew.wa...@arm.com>
Date: Thu, 7 Apr 2016 13:32:15 +0100
Subject: [PATCH 04/17] [PATCH 4/17][ARM] Define feature macros for FP16.
2016-05-17 Matthew Wahab <matthew.wa...@arm.com>
* config/arm/arm-c.c (arm_cpu_builtins): Define
"__ARM_FEATURE_FP16_SCALAR_ARITHMETIC" and
"__ARM_FEATURE_FP16_VECTOR_ARITHMETIC".
testsuite/
2016-05-17 Matthew Wahab <matthew.wa...@arm.com>
* gcc.target/arm/attr-fp16-arith-1.c: New.
---
gcc/config/arm/arm-c.c | 5 +++
gcc/testsuite/gcc.target/arm/attr-fp16-arith-1.c | 45 ++++++++++++++++++++++++
2 files changed, 50 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/arm/attr-fp16-arith-1.c
diff --git a/gcc/config/arm/arm-c.c b/gcc/config/arm/arm-c.c
index b98470f..7283700 100644
--- a/gcc/config/arm/arm-c.c
+++ b/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);
diff --git a/gcc/testsuite/gcc.target/arm/attr-fp16-arith-1.c b/gcc/testsuite/gcc.target/arm/attr-fp16-arith-1.c
new file mode 100644
index 0000000..5011315
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/attr-fp16-arith-1.c
@@ -0,0 +1,45 @@
+/* { 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
--
2.1.4
