-
Notifications
You must be signed in to change notification settings - Fork 20
/
functions_neg_and_abs.go
36 lines (33 loc) · 1.1 KB
/
functions_neg_and_abs.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
// This file is part of Gopher2600.
//
// Gopher2600 is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Gopher2600 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. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Gopher2600. If not, see <https://www.gnu.org/licenses/>.
package fpu
func (fpu *FPU) FPNeg(value uint64, N int) uint64 {
switch N {
case 32:
return value ^ 0xffffffff80000000
case 64:
return value ^ 0x8000000000000000
}
panic("unsupported number of bits for FPNeg() function")
}
func (fpu *FPU) FPAbs(value uint64, N int) uint64 {
switch N {
case 32:
return value & 0x7fffffff
case 64:
return value & 0x7fffffffffffffff
}
panic("unsupported number of bits for FPAbs() function")
}