diff options
author | Xavier Leroy <xavierleroy@users.noreply.github.com> | 2016-10-27 16:26:08 +0200 |
---|---|---|
committer | GitHub <noreply@github.com> | 2016-10-27 16:26:08 +0200 |
commit | 9922feea537ced718a3822dd50eabc87da060338 (patch) | |
tree | 6f67bb6707ef59e50d6bb81c61b2ed0b3c6097ab /runtime/x86_64/i64_utod.S | |
parent | f2d6637c7d4a11f961ff289e64f70bf4de93d0aa (diff) | |
parent | d50773e537ec6729f9152b545c6f938ab19eb7b8 (diff) | |
download | compcert-9922feea537ced718a3822dd50eabc87da060338.tar.gz compcert-9922feea537ced718a3822dd50eabc87da060338.zip |
Merge pull request #145 from AbsInt/64
Support for 64-bit target processors + support for x86 in 64-bit mode
Diffstat (limited to 'runtime/x86_64/i64_utod.S')
-rw-r--r-- | runtime/x86_64/i64_utod.S | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/runtime/x86_64/i64_utod.S b/runtime/x86_64/i64_utod.S new file mode 100644 index 00000000..96b77a64 --- /dev/null +++ b/runtime/x86_64/i64_utod.S @@ -0,0 +1,56 @@ +// ***************************************************************** +// +// The Compcert verified compiler +// +// Xavier Leroy, INRIA Paris +// +// Copyright (c) 2016 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. x86_64 version. + +#include "sysdeps.h" + +// Conversion unsigned long -> double-precision float + +FUNCTION(__i64_utod) + testq %rdi, %rdi + js 1f + pxor %xmm0, %xmm0 // if < 2^63, + cvtsi2sdq %rdi, %xmm0 // convert as if signed + ret +1: // if >= 2^63, use round-to-odd trick + movq %rdi, %rax + shrq %rax + andq $1, %rdi + orq %rdi, %rax // (arg >> 1) | (arg & 1) + pxor %xmm0, %xmm0 + cvtsi2sdq %rax, %xmm0 // convert as if signed + addsd %xmm0, %xmm0 // multiply result by 2.0 + ret +ENDFUNCTION(__i64_utod) |