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Diffstat (limited to 'runtime/ia32/i64_sdiv.S')
| -rw-r--r-- | runtime/ia32/i64_sdiv.S | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/runtime/ia32/i64_sdiv.S b/runtime/ia32/i64_sdiv.S new file mode 100644 index 0000000..f6551c7 --- /dev/null +++ b/runtime/ia32/i64_sdiv.S @@ -0,0 +1,74 @@ +// ***************************************************************** +// +// 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" + +// Signed division + +FUNCTION(__i64_sdiv) + pushl %ebp + pushl %esi + pushl %edi + movl 20(%esp), %esi // esi = NH + movl %esi, %ebp // save sign of N in ebp + testl %esi, %esi + jge 1f // if N < 0, + negl 16(%esp) // N = -N + adcl $0, %esi + negl %esi + movl %esi, 20(%esp) +1: movl 28(%esp), %esi // esi = DH + xorl %esi, %ebp // sign of result in ebp + testl %esi, %esi + jge 2f // if D < 0, + negl 24(%esp) // D = -D + adcl $0, %esi + negl %esi + movl %esi, 28(%esp) +2: call GLOB(__i64_udivmod) + testl %ebp, %ebp // apply sign to result + jge 3f + negl %esi + adcl $0, %edi + negl %edi +3: movl %esi, %eax + movl %edi, %edx + popl %edi + popl %esi + popl %ebp + ret +ENDFUNCTION(__i64_sdiv) + |