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Diffstat (limited to 'runtime/powerpc/i64_smod.s')
| -rw-r--r-- | runtime/powerpc/i64_smod.s | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/runtime/powerpc/i64_smod.s b/runtime/powerpc/i64_smod.s new file mode 100644 index 0000000..4787334 --- /dev/null +++ b/runtime/powerpc/i64_smod.s @@ -0,0 +1,65 @@ +# ***************************************************************** +# +# 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. PowerPC version. + + .text + +## Signed remainder + + .balign 16 + .globl __i64_smod +__i64_smod: + mflr r11 # save return address + srawi r12, r3, 31 # save sign of result in r12 (sign of N) + xor r4, r4, r12 # and take absolute value of N + xor r3, r3, r12 + subfc r4, r12, r4 + subfe r3, r12, r3 + srawi r0, r5, 31 # take absolute value of D + xor r6, r6, r0 + xor r5, r5, r0 + subfc r6, r0, r6 + subfe r5, r0, r5 + bl __i64_umod # do unsigned division + mtlr r11 # restore return address + xor r4, r4, r12 # apply expected sign to remainder + xor r3, r3, r12 # RES = R if r12 == 0, -R if r12 == -1 + subfc r4, r12, r4 + subfe r3, r12, r3 + blr + .type __i64_smod, @function + .size __i64_smod, .-__i64_smod + +
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