/*
* Copyright 2014 Martin Peres <[email protected]>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the folloing conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: Martin Peres
*/
/******************************************************************************
* arith data segment
*****************************************************************************/
#ifdef INCLUDE_PROC
#endif
#ifdef INCLUDE_DATA
#endif
/******************************************************************************
* arith code segment
*****************************************************************************/
#ifdef INCLUDE_CODE
// does a 32x32 -> 64 multiplication
//
// A * B = A_lo * B_lo
// + ( A_hi * B_lo ) << 16
// + ( A_lo * B_hi ) << 16
// + ( A_hi * B_hi ) << 32
//
// $r15 - current
// $r14 - A
// $r13 - B
// $r12 - mul_lo (return)
// $r11 - mul_hi (return)
// $r0 - zero
mulu32_32_64:
push $r1 // A_hi
push $r2 // B_hi
push $r3 // tmp0
push $r4 // tmp1
shr b32 $r1 $r14 16
shr b32 $r2 $r13 16
clear b32 $r12
clear b32 $r11
// A_lo * B_lo
mulu $r12 $r14 $r13
// ( A_hi * B_lo ) << 16
mulu $r3 $r1 $r13 // tmp0 = A_hi * B_lo
mov b32 $r4 $r3
and $r3 0xffff // tmp0 = tmp0_lo
shl b32 $r3 16
shr b32 $r4 16 // tmp1 = tmp0_hi
add b32 $r12 $r3
adc b32 $r11 $r4
// ( A_lo * B_hi ) << 16
mulu $r3 $r14 $r2 // tmp0 = A_lo * B_hi
mov b32 $r4 $r3
and $r3 0xffff // tmp0 = tmp0_lo
shl b32 $r3 16
shr b32 $r4 16 // tmp1 = tmp0_hi
add b32 $r12 $r3
adc b32 $r11 $r4
// ( A_hi * B_hi ) << 32
mulu $r3 $r1 $r2 // tmp0 = A_hi * B_hi
add b32 $r11 $r3
pop $r4
pop $r3
pop $r2
pop $r1
ret
#endif
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