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authorGravatar xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e>2013-04-23 09:18:37 +0000
committerGravatar xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e>2013-04-23 09:18:37 +0000
commit4d78351d21f8a52c4b64313354f24dd534205256 (patch)
treef562e1ac1eb953e09a0acfccd275ba706e16521b /runtime/ia32/i64_dtos.S
parent945e1e3c0e601f711ab83f65333f4c2b9e713c99 (diff)
Make ia32/ code more portable across systems.
git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2214 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
Diffstat (limited to 'runtime/ia32/i64_dtos.S')
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diff --git a/runtime/ia32/i64_dtos.S b/runtime/ia32/i64_dtos.S
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+// *****************************************************************
+//
+// The Compcert verified compiler
+//
+// Xavier Leroy, INRIA Paris-Rocquencourt
+//
+// Copyright (c) 2013 Institut National de Recherche en Informatique et
+// en Automatique.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+// notice, this list of conditions and the following disclaimer in the
+// documentation and/or other materials provided with the distribution.
+// * Neither the name of the <organization> nor the
+// names of its contributors may be used to endorse or promote products
+// derived from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT
+// HOLDER> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// *********************************************************************
+
+// Helper functions for 64-bit integer arithmetic. IA32 version.
+
+#include "sysdeps.h"
+
+// Conversion float -> signed long
+
+FUNCTION(__i64_dtos)
+ subl $4, %esp
+ // Change rounding mode to "round towards zero"
+ fnstcw 0(%esp)
+ movw 0(%esp), %ax
+ movb $12, %ah
+ movw %ax, 2(%esp)
+ fldcw 2(%esp)
+ // Convert
+ fldl 8(%esp)
+ fistpll 8(%esp)
+ // Restore rounding mode
+ fldcw 0(%esp)
+ // Load result in edx:eax
+ movl 8(%esp), %eax
+ movl 12(%esp), %edx
+ addl $4, %esp
+ ret
+ENDFUNCTION(__i64_dtos)
+