diff options
Diffstat (limited to 'runtime/powerpc/i64_utod.s')
| -rw-r--r-- | runtime/powerpc/i64_utod.s | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/runtime/powerpc/i64_utod.s b/runtime/powerpc/i64_utod.s new file mode 100644 index 0000000..e40eb5c --- /dev/null +++ b/runtime/powerpc/i64_utod.s @@ -0,0 +1,66 @@ +# ***************************************************************** +# +# 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 + +### Conversion from unsigned long to double float + + .balign 16 + .globl __i64_utod +__i64_utod: + addi r1, r1, -16 + lis r5, 0x4330 + li r6, 0 + stw r5, 0(r1) + stw r4, 4(r1) # 0(r1) = 2^52 + (double) XL + stw r5, 8(r1) + stw r6, 12(r1) # 8(r1) = 2^52 + lfd f1, 0(r1) + lfd f2, 8(r1) + fsub f1, f1, f2 # f1 is (double) XL + lis r5, 0x4530 + stw r5, 0(r1) # 0(r1) = 2^84 + (double) XL * 2^32 + stw r3, 4(r1) + stw r5, 8(r1) # 1(r1) = 2^84 + lfd f2, 0(r1) + lfd f3, 8(r1) + fsub f2, f2, f3 # f2 is XH * 2^32 as a double + fadd f1, f1, f2 # add both to get result + addi r1, r1, 16 + blr + .type __i64_utod, @function + .size __i64_utod, .-__i64_utod + |