condcodes.hh (4683:3b49d35562ed) condcodes.hh (4715:2c37daa0ff2e)
1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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27 *
28 * Authors: Gabe Black
29 */
30
31#ifndef __BASE_CONDCODE_HH__
32#define __BASE_CONDCODE_HH__
33
34#include "base/bitfield.hh"
1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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27 *
28 * Authors: Gabe Black
29 */
30
31#ifndef __BASE_CONDCODE_HH__
32#define __BASE_CONDCODE_HH__
33
34#include "base/bitfield.hh"
35#include "base/trace.hh"
35
36/**
37 * Calculate the carry flag from an addition. This should work even when
38 * a carry value is also added in.
39 */
40inline
41bool
42findCarry(int width, uint64_t dest, uint64_t src1, uint64_t src2) {
43 int shift = width - 1;
36
37/**
38 * Calculate the carry flag from an addition. This should work even when
39 * a carry value is also added in.
40 */
41inline
42bool
43findCarry(int width, uint64_t dest, uint64_t src1, uint64_t src2) {
44 int shift = width - 1;
44 return (~(dest >> shift) + (src1 >> shift) + (src2 >> shift)) & 0x2;
45 return ((~(dest >> shift) & 1) +
46 ((src1 >> shift) & 1) +
47 ((src2 >> shift) & 1)) & 0x2;
45}
46
47/**
48 * Calculate the overflow flag from an addition.
49 */
50inline
51bool
52findOverflow(int width, uint64_t dest, uint64_t src1, uint64_t src2) {

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49
50/**
51 * Calculate the overflow flag from an addition.
52 */
53inline
54bool
55findOverflow(int width, uint64_t dest, uint64_t src1, uint64_t src2) {

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