mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-04-30 16:53:41 +02:00
2adcae0cd8
* fixed fixref() which did not always treat addresses as 64 bit sizes, resulting in problems using above optimization * cleanup * removed assembly fpc_int_real again, has problems with border cases git-svn-id: trunk@3795 -
111 lines
3.4 KiB
PHP
111 lines
3.4 KiB
PHP
{
|
|
This file is part of the Free Pascal run time library.
|
|
Copyright (c) 2000 by Jonas Maebe and other members of the
|
|
Free Pascal development team
|
|
|
|
Implementation of mathematical Routines (only for real)
|
|
|
|
See the file COPYING.FPC, included in this distribution,
|
|
for details about the copyright.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
|
|
**********************************************************************}
|
|
|
|
{****************************************************************************
|
|
EXTENDED data type routines
|
|
****************************************************************************}
|
|
|
|
{$define FPC_SYSTEM_HAS_PI}
|
|
function fpc_pi_real : valreal;compilerproc;
|
|
begin
|
|
{ Function is handled internal in the compiler }
|
|
runerror(207);
|
|
result:=0;
|
|
end;
|
|
|
|
{$define FPC_SYSTEM_HAS_ABS}
|
|
function fpc_abs_real(d : valreal) : valreal;compilerproc;
|
|
begin
|
|
{ Function is handled internal in the compiler }
|
|
runerror(207);
|
|
result:=0;
|
|
end;
|
|
|
|
{$define FPC_SYSTEM_HAS_SQR}
|
|
function fpc_sqr_real(d : valreal) : valreal;compilerproc;
|
|
begin
|
|
{ Function is handled internal in the compiler }
|
|
runerror(207);
|
|
result:=0;
|
|
end;
|
|
|
|
{$define FPC_SYSTEM_HAS_TRUNC}
|
|
function fpc_trunc_real(d : valreal) : int64;compilerproc; assembler; nostackframe;
|
|
{ input: d in fr1 }
|
|
{ output: result in r3 }
|
|
asm
|
|
fctidz f1, f1
|
|
stfd f1, -8(r1)
|
|
ld r3, -8(r1)
|
|
end;
|
|
|
|
{$define FPC_SYSTEM_HAS_ROUND}
|
|
function fpc_round_real(d : valreal) : int64; compilerproc;assembler; nostackframe;
|
|
{ exactly the same as trunc, except that one fctiwz has become fctiw }
|
|
{ input: d in fr1 }
|
|
{ output: result in r3 }
|
|
asm
|
|
fctid f1, f1
|
|
stfd f1, -8(r1)
|
|
ld r3, -8(r1)
|
|
end;
|
|
|
|
{****************************************************************************
|
|
Int to real helpers
|
|
****************************************************************************}
|
|
|
|
{$define FPC_SYSTEM_HAS_INT64_TO_DOUBLE}
|
|
function fpc_int64_to_double(i: int64): double; compilerproc;assembler;
|
|
{ input: i in r3 }
|
|
{ output: double(i) in f0 }
|
|
{from "PowerPC Microprocessor Family: Programming Environments Manual for 64 and 32-Bit Microprocessors", v2.0, pg. 698 }
|
|
var temp : int64;
|
|
asm
|
|
std r3,temp // store dword
|
|
lfd f0,temp // load float
|
|
fcfid f0,f0 // convert to fpu int
|
|
end;
|
|
|
|
{$define FPC_SYSTEM_HAS_QWORD_TO_DOUBLE}
|
|
function fpc_qword_to_double(q: qword): double; compilerproc;assembler;
|
|
const
|
|
longint_to_real_helper: qword = $80000000;
|
|
{from "PowerPC Microprocessor Family: Programming Environments Manual for
|
|
64 and 32-Bit Microprocessors", v2.0, pg. 698, *exact version* }
|
|
{ input: q in r3 }
|
|
{ output: double(q) in f0 }
|
|
var
|
|
temp1, temp2: qword;
|
|
asm
|
|
// load 2^32 into f4
|
|
lis r4, longint_to_real_helper@highesta
|
|
ori r4, r4, longint_to_real_helper@highera
|
|
sldi r4, r4, 32
|
|
oris r4, r4, longint_to_real_helper@ha
|
|
lfd f4, longint_to_real_helper@l(r4)
|
|
|
|
rldicl r4,r3,32,32 // isolate high half
|
|
rldicl r0,r3,0,32 // isolate low half
|
|
std r4,temp1 // store dword both
|
|
std r0,temp2
|
|
lfd f2,temp1 // load float both
|
|
lfd f0,temp2 // load float both
|
|
fcfid f2,f2 // convert each half to
|
|
fcfid f0,f0 // fpu int (no rnd)
|
|
fmadd f0,f4,f2,f0 // (2**32)*high+low (only add can rnd)
|
|
end;
|
|
|