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Diffstat (limited to 'runtime/powerpc/i64_smulh.s')
| -rw-r--r-- | runtime/powerpc/i64_smulh.s | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/runtime/powerpc/i64_smulh.s b/runtime/powerpc/i64_smulh.s deleted file mode 100644 index 73393fce..00000000 --- a/runtime/powerpc/i64_smulh.s +++ /dev/null @@ -1,80 +0,0 @@ -# ***************************************************************** -# -# The Compcert verified compiler -# -# Xavier Leroy, INRIA Paris -# -# Copyright (c) 2016 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 multiply-high - -# Hacker's Delight section 8.3: -# - compute high 64 bits of the unsigned product X * Y (see i64_umulh.S) -# - subtract X if Y < 0 -# - subtract Y if X < 0 - - .balign 16 - .globl __compcert_i64_smulh -__compcert_i64_smulh: -# r7:r8:r9 accumulate bits 127:32 of the full unsigned product - mulhwu r9, r4, r6 # r9 = high half of XL.YL - mullw r0, r4, r5 # r0 = low half of XL.YH - addc r9, r9, r0 - mulhwu r0, r4, r5 # r0 = high half of XL.YH - addze r8, r0 - mullw r0, r3, r6 # r0 = low half of XH.YL - addc r9, r9, r0 - mulhwu r0, r3, r6 # r0 = high half of XH.YL - adde r8, r8, r0 - li r7, 0 - addze r7, r7 - mullw r0, r3, r5 # r0 = low half of XH.YH - addc r8, r8, r0 - mulhwu r0, r3, r5 # r0 = high half of XH.YH - adde r7, r7, r0 -# Here r7:r8 contains the high 64 bits of the unsigned product. -# Now, test signs and subtract if needed - srawi r0, r3, 31 # r0 = -1 if X < 0, r0 = 0 if X >= 0 - srawi r9, r5, 31 # r9 = -1 if Y < 0, r9 = 0 if Y >= 0 - and r3, r3, r9 # set X = 0 if Y >= 0 - and r4, r4, r9 - and r5, r5, r0 # set Y = 0 if X >= 0 - and r6, r6, r0 - subfc r8, r4, r8 # subtract X - subfe r7, r3, r7 - subfc r4, r6, r8 # subtract Y - subfe r3, r5, r7 - blr - .type __compcert_i64_smulh, @function - .size __compcert_i64_smulh, .-__compcert_i64_smulh - |