diff options
Diffstat (limited to 'runtime/powerpc/i64_sdiv.s')
-rw-r--r-- | runtime/powerpc/i64_sdiv.s | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/runtime/powerpc/i64_sdiv.s b/runtime/powerpc/i64_sdiv.s new file mode 100644 index 00000000..6f2547f2 --- /dev/null +++ b/runtime/powerpc/i64_sdiv.s @@ -0,0 +1,67 @@ +# ***************************************************************** +# +# 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 division + + .balign 16 + .globl __i64_sdiv +__i64_sdiv: + mflr r11 # save return address + xor r12, r3, r5 # save sign of result in r12 (top bit) + srawi r0, r3, 31 # take absolute value of N + xor r4, r4, r0 # (i.e. N = N ^ r0 - r0, + xor r3, r3, r0 # where r0 = 0 if N >= 0 and r0 = -1 if N < 0) + subfc r4, r0, r4 + subfe r3, r0, r3 + srawi r0, r5, 31 # take absolute value of D + xor r6, r6, r0 # (same trick) + xor r5, r5, r0 + subfc r6, r0, r6 + subfe r5, r0, r5 + bl __i64_umod # do unsigned division + mtlr r11 # restore return address + srawi r0, r12, 31 # apply expected sign to quotient + xor r8, r8, r0 # RES = Q if r12 >= 0, -Q if r12 < 0 + xor r7, r7, r0 + subfc r4, r0, r8 + subfe r3, r0, r7 + blr + .type __i64_sdiv, @function + .size __i64_sdiv, .-__i64_sdiv + +
\ No newline at end of file |