[AArch64] Add support for crtfastmath.c

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Headers	show Return-Path: <patchwork-forward+bncBCRZHD4OJAIPXXNFUACRUBGWQHTU4@linaro.org> Received-SPF: pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 2607:f8b0:400c:c03::233 as permitted sender) client-ip=2607:f8b0:400c:c03::233; Received-SPF: pass (google.com: domain of gcc-patches-return-376974-patch=linaro.org@gcc.gnu.org designates 209.132.180.131 as permitted sender) client-ip=209.132.180.131; Mailing-List: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org Precedence: list Sender: gcc-patches-owner@gcc.gnu.org Message-ID: <54096E98.900@arm.com> Date: Fri, 05 Sep 2014 09:04:40 +0100 From: Ramana Radhakrishnan <ramana.radhakrishnan@arm.com> User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0 MIME-Version: 1.0 To: Richard Henderson <rth@redhat.com>, "gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org> CC: Marcus Shawcroft <Marcus.Shawcroft@arm.com> Subject: Re: [Patch AArch64] Add support for crtfastmath.c References: <54087170.1040505@arm.com> <54089D9A.1090106@redhat.com> In-Reply-To: <54089D9A.1090106@redhat.com> Content-Type: multipart/mixed; boundary="------------030108020300010209040908"

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Date: Fri, 05 Sep 2014 09:04:40 +0100
From: Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
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CC: Marcus Shawcroft <Marcus.Shawcroft@arm.com>
Subject: Re: [Patch AArch64] Add support for crtfastmath.c
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Commit Message

Ramana Radhakrishnan Sept. 5, 2014, 8:04 a.m. UTC

On 04/09/14 18:12, Richard Henderson wrote:
> On 09/04/2014 07:04 AM, Ramana Radhakrishnan wrote:
>> gcc/Changelog
>>
>> 2014-09-04  Marcus Shawcroft  <marcus.shawcroft@arm.com>
>>              Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
>>
>>             * config/aarch64/aarch64-elf-raw.h (ENDFILE_SPEC): Add crtfastmath.o.
>>             * config/aarch64/aarch64-linux.h
>> (GNU_USER_TARGET_MATH_ENDFILE_SPEC): Define.
>>               (ENDFILE_SPEC): Define and use GNU_USER_TARGET_MATH_ENDFILE_SPEC.
>>
>> libgcc/Changelog
>>
>> 2014-09-04  Marcus Shawcroft  <marcus.shawcroft@arm.com>
>>              Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
>>
>>                 * config.host (aarch64*): Include crtfastmath and t-crtfm.
>>                 * config/aarch64/crtfastmath.c: New file.
>
> ENOPATCH.
>
>
> r~
>


Bah - ofcourse.

Here it is attached.

Ramana

Comments

Marcus Shawcroft Sept. 9, 2014, 9:35 a.m. UTC | #1

On 5 September 2014 09:04, Ramana Radhakrishnan
<ramana.radhakrishnan@arm.com> wrote:

>> On 09/04/2014 07:04 AM, Ramana Radhakrishnan wrote:
>>>
>>> gcc/Changelog
>>>
>>> 2014-09-04  Marcus Shawcroft  <marcus.shawcroft@arm.com>
>>>              Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
>>>
>>>             * config/aarch64/aarch64-elf-raw.h (ENDFILE_SPEC): Add
>>> crtfastmath.o.
>>>             * config/aarch64/aarch64-linux.h
>>> (GNU_USER_TARGET_MATH_ENDFILE_SPEC): Define.
>>>               (ENDFILE_SPEC): Define and use
>>> GNU_USER_TARGET_MATH_ENDFILE_SPEC.
>>>
>>> libgcc/Changelog
>>>
>>> 2014-09-04  Marcus Shawcroft  <marcus.shawcroft@arm.com>
>>>              Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
>>>
>>>                 * config.host (aarch64*): Include crtfastmath and
>>> t-crtfm.
>>>                 * config/aarch64/crtfastmath.c: New file.

> Bah - ofcourse.
>
> Here it is attached.
>
> Ramana

OK /Marcus

diff --git a/gcc/config/aarch64/aarch64-elf-raw.h b/gcc/config/aarch64/aarch64-elf-raw.h
index adec7e7..b9d4e8d 100644
--- a/gcc/config/aarch64/aarch64-elf-raw.h
+++ b/gcc/config/aarch64/aarch64-elf-raw.h
@@ -23,7 +23,9 @@ 
 #define GCC_AARCH64_ELF_RAW_H
 
 #define STARTFILE_SPEC " crti%O%s crtbegin%O%s crt0%O%s"
-#define ENDFILE_SPEC " crtend%O%s crtn%O%s"
+#define ENDFILE_SPEC \
+  " crtend%O%s crtn%O%s " \
+  "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s}"
 
 #ifndef LINK_SPEC
 #define LINK_SPEC "%{mbig-endian:-EB} %{mlittle-endian:-EL} -X \
diff --git a/gcc/config/aarch64/aarch64-linux.h b/gcc/config/aarch64/aarch64-linux.h
index 8d20310..1731432 100644
--- a/gcc/config/aarch64/aarch64-linux.h
+++ b/gcc/config/aarch64/aarch64-linux.h
@@ -37,6 +37,14 @@ 
 
 #define LINK_SPEC LINUX_TARGET_LINK_SPEC
 
+#define GNU_USER_TARGET_MATHFILE_SPEC \
+  "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s}"
+
+#undef ENDFILE_SPEC
+#define ENDFILE_SPEC   \
+  GNU_USER_TARGET_MATHFILE_SPEC " " \
+  GNU_USER_TARGET_ENDFILE_SPEC
+
 #define TARGET_OS_CPP_BUILTINS()		\
   do						\
     {						\
diff --git a/libgcc/config.host b/libgcc/config.host
index 0550c34..2ea8f20 100644
--- a/libgcc/config.host
+++ b/libgcc/config.host
@@ -322,13 +322,15 @@  esac
 case ${host} in
 aarch64*-*-elf)
 	extra_parts="$extra_parts crtbegin.o crtend.o crti.o crtn.o"
+	extra_parts="$extra_parts crtfastmath.o"
 	tmake_file="${tmake_file} ${cpu_type}/t-aarch64"
-	tmake_file="${tmake_file} ${cpu_type}/t-softfp t-softfp"
+	tmake_file="${tmake_file} ${cpu_type}/t-softfp t-softfp t-crtfm"
 	;;
 aarch64*-*-linux*)
+	extra_parts="$extra_parts crtfastmath.o"
 	md_unwind_header=aarch64/linux-unwind.h
 	tmake_file="${tmake_file} ${cpu_type}/t-aarch64"
-	tmake_file="${tmake_file} ${cpu_type}/t-softfp t-softfp"
+	tmake_file="${tmake_file} ${cpu_type}/t-softfp t-softfp t-crtfm"
 	;;
 alpha*-*-linux*)
 	tmake_file="${tmake_file} alpha/t-alpha alpha/t-ieee t-crtfm alpha/t-linux"
diff --git a/libgcc/config/aarch64/crtfastmath.c b/libgcc/config/aarch64/crtfastmath.c
new file mode 100644
index 0000000..3a8ddfc
--- /dev/null
+++ b/libgcc/config/aarch64/crtfastmath.c
@@ -0,0 +1,36 @@ 
+/*
+ * Copyright (C) 2014 Free Software Foundation, Inc.
+ *
+ * This file is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 3, or (at your option) any
+ * later version.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * Under Section 7 of GPL version 3, you are granted additional
+ * permissions described in the GCC Runtime Library Exception, version
+ * 3.1, as published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License and
+ * a copy of the GCC Runtime Library Exception along with this program;
+ * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#define _FPU_FPCR_FZ 0x1000000
+
+#define _FPU_SETCW(fpcr)				   \
+  {							   \
+    __asm__ __volatile__ ("msr	fpcr, %0" : : "r" (fpcr)); \
+  }
+
+static void __attribute__((constructor))
+set_fast_math (void)
+{
+  /* Flush to zero, round to nearest, IEEE exceptions disabled.  */
+  _FPU_SETCW (_FPU_FPCR_FZ);
+}