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[ARM] Add FP16 feature extension for ARMv8.2 architecture
- From: Jiong Wang <jiong dot wang at foss dot arm dot com>
- To: "binutils at sourceware dot org" <binutils at sourceware dot org>
- Cc: Ramana Radhakrishnan <ramana dot radhakrishnan at arm dot com>
- Date: Tue, 16 Feb 2016 11:04:47 +0000
- Subject: [ARM] Add FP16 feature extension for ARMv8.2 architecture
- Authentication-results: sourceware.org; auth=none
This patch adds FP16 feature extension for ARMv8.2 architecture.
You can enable fp16 support by commands like:
-march=armv8.2-a+fp16 -mfpu=neon-fp-armv8
OK for trunk?
2016-02-16 Matthew Wahab <matthew.wahab@arm.com>
Jiong Wang <jiong.wang@arm.com>
include/
* opcode/arm.h (ARM_EXT2_FP16_INSN): New.
gas/
* config/tc-arm.c (arm_ext_fp16): New.
(arm_extensions): New entry for "fp16".
diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index 4a16267..c88dc68 100644
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -216,6 +216,9 @@ static const arm_feature_set arm_ext_atomics =
ARM_FEATURE_CORE_HIGH (ARM_EXT2_ATOMICS);
static const arm_feature_set arm_ext_v8_2 =
ARM_FEATURE_CORE_HIGH (ARM_EXT2_V8_2A);
+/* FP16 instructions. */
+static const arm_feature_set arm_ext_fp16 =
+ ARM_FEATURE_CORE_HIGH (ARM_EXT2_FP16_INST);
static const arm_feature_set arm_arch_any = ARM_ANY;
static const arm_feature_set arm_arch_full = ARM_FEATURE (-1, -1, -1);
@@ -25075,6 +25078,9 @@ static const struct arm_option_extension_value_table arm_extensions[] =
ARM_FEATURE_CORE_LOW (ARM_EXT_V8)),
ARM_EXT_OPT ("fp", FPU_ARCH_VFP_ARMV8, ARM_FEATURE_COPROC (FPU_VFP_ARMV8),
ARM_FEATURE_CORE_LOW (ARM_EXT_V8)),
+ ARM_EXT_OPT ("fp16", ARM_FEATURE_CORE_HIGH (ARM_EXT2_FP16_INST),
+ ARM_FEATURE_CORE_HIGH (ARM_EXT2_FP16_INST),
+ ARM_ARCH_V8_2A),
ARM_EXT_OPT ("idiv", ARM_FEATURE_CORE_LOW (ARM_EXT_ADIV | ARM_EXT_DIV),
ARM_FEATURE_CORE_LOW (ARM_EXT_ADIV | ARM_EXT_DIV),
ARM_FEATURE_CORE_LOW (ARM_EXT_V7A | ARM_EXT_V7R)),
diff --git a/include/opcode/arm.h b/include/opcode/arm.h
index eab5025..1dc301e 100644
--- a/include/opcode/arm.h
+++ b/include/opcode/arm.h
@@ -52,7 +52,7 @@
#define ARM_EXT_MP 0x08000000 /* Multiprocessing Extensions. */
#define ARM_EXT_SEC 0x10000000 /* Security extensions. */
#define ARM_EXT_OS 0x20000000 /* OS Extensions. */
-#define ARM_EXT_ADIV 0x40000000 /* Integer divide extensions in ARM
+#define ARM_EXT_ADIV 0x40000000 /* Integer divide extensions in ARM
state. */
#define ARM_EXT_VIRT 0x80000000 /* Virtualization extensions. */
@@ -61,6 +61,7 @@
#define ARM_EXT2_V8M 0x00000004 /* ARM V8M. */
#define ARM_EXT2_ATOMICS 0x00000008 /* ARMv8 atomics. */
#define ARM_EXT2_V6T2_V8M 0x00000010 /* V8M Baseline from V6T2. */
+#define ARM_EXT2_FP16_INST 0x00000020 /* ARM V8.2A FP16 instructions. */
/* Co-processor space extensions. */
#define ARM_CEXT_XSCALE 0x00000001 /* Allow MIA etc. */