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Re: [PATCH 1/2][ARM] Record FPU features as a bit-set
- From: Matthew Wahab <matthew dot wahab at foss dot arm dot com>
- To: gcc-patches at gcc dot gnu dot org
- Date: Mon, 10 Aug 2015 11:28:06 +0100
- Subject: Re: [PATCH 1/2][ARM] Record FPU features as a bit-set
- Authentication-results: sourceware.org; auth=none
- References: <558826B0 dot 401 at arm dot com>
Ping. Updated patch attached.
Also, retested the series for arm-none-linux-gnueabihf with native bootstrap and make
check.
On 22/06/15 16:16, Matthew Wahab wrote:
Hello,
The ARM backend records FPU features as booleans, one for each feature. This
means that adding support for a new feature involves updating every entry in the
list of FPU descriptions in arm-fpus.def. This patch series changes the
representation of FPU features to use a simple bit-set and flags, as is done
elsewhere.
This patch adds the new FPU feature representation, with feature sets
represented as unsigned longs.
Tested the series for arm-none-linux-gnueabihf with check-gcc
Ok for trunk?
Matthew
gcc/
2015-06-22 Matthew Wahab <matthew.wahab@arm.com>
* config/arm/arm.h (arm_fpu_fset): New.
(ARM_FPU_FSET_HAS): New.
(FPU_FL_NONE): New.
(FPU_FL_NEON): New.
(FPU_FL_FP16): New.
(FPU_FL_CRYPTO): New.
>From 571416d9e7bc9cb6c16008486faf357873270991 Mon Sep 17 00:00:00 2001
From: Matthew Wahab <matthew.wahab@arm.com>
Date: Thu, 23 Jul 2015 12:44:51 +0100
Subject: [PATCH 1/2] Add fpu feature set definitions.
Change-Id: I9f0fcc9627e3c435cbbc9056b9244781b438447e
---
gcc/config/arm/arm.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h
index bb64be0..f49eb48 100644
--- a/gcc/config/arm/arm.h
+++ b/gcc/config/arm/arm.h
@@ -318,6 +318,19 @@ extern void (*arm_lang_output_object_attributes_hook)(void);
{"mode", "%{!marm:%{!mthumb:-m%(VALUE)}}"}, \
{"tls", "%{!mtls-dialect=*:-mtls-dialect=%(VALUE)}"},
+/* FPU feature sets. */
+
+typedef unsigned long arm_fpu_feature_set;
+
+/* Test for an FPU feature. */
+#define ARM_FPU_FSET_HAS(S,F) (((S) & (F)) == (F))
+
+/* FPU Features. */
+#define FPU_FL_NONE (0)
+#define FPU_FL_NEON (1 << 0) /* NEON instructions. */
+#define FPU_FL_FP16 (1 << 1) /* Half-precision. */
+#define FPU_FL_CRYPTO (1 << 2) /* Crypto extensions. */
+
/* Which floating point model to use. */
enum arm_fp_model
{
--
1.9.1