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Diffstat (limited to 'runtime/ia32/i64_smod.s')
| -rw-r--r-- | runtime/ia32/i64_smod.s | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/runtime/ia32/i64_smod.s b/runtime/ia32/i64_smod.s new file mode 100644 index 0000000..66503cc --- /dev/null +++ b/runtime/ia32/i64_smod.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. + + .text + +# Signed remainder + + .globl __i64_smod + .balign 16 +__i64_smod: + pushl %ebp + pushl %esi + pushl %edi + movl 20(%esp), %esi # esi = NH + movl %esi, %ebp # save sign of result 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 + testl %esi, %esi + jge 2f # if D < 0, + negl 24(%esp) # D = -D + adcl $0, %esi + negl %esi + movl %esi, 28(%esp) +2: call __i64_udivmod + testl %ebp, %ebp # apply sign to result + jge 3f + negl %eax + adcl $0, %edx + negl %edx +3: popl %edi + popl %esi + popl %ebp + ret + .type __i64_smod, @function + .size __i64_smod, . - __i64_smod + |