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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,182 @@ | ||
| /******************************************************************************\ | ||
| ** | ||
| ** This file is part of the Hades GBA Emulator, and is made available under | ||
| ** the terms of the GNU General Public License version 2. | ||
| ** | ||
| ** Copyright (C) 2021-2023 - The Hades Authors | ||
| ** | ||
| \******************************************************************************/ | ||
|
|
||
| #pragma once | ||
|
|
||
| #include "hades.h" | ||
|
|
||
| /* | ||
| ** Sign-extend a 8-bits value to a signed 32-bit value. | ||
| */ | ||
| static inline | ||
| int32_t | ||
| sign_extend8( | ||
| uint32_t value | ||
| ) { | ||
| if ((value & 0x80) != 0) { | ||
| return ((int32_t)(value | 0xFFFFFF00)); | ||
| } else { | ||
| return ((int32_t)value); | ||
| } | ||
| } | ||
|
|
||
| /* | ||
| ** Sign-extend a 9-bits value to a signed 32-bit value. | ||
| */ | ||
| static inline | ||
| int32_t | ||
| sign_extend9( | ||
| uint32_t value | ||
| ) { | ||
| if ((value & 0x100) != 0) { | ||
| return ((int32_t)(value | 0xFFFFFF00)); | ||
| } else { | ||
| return ((int32_t)value); | ||
| } | ||
| } | ||
|
|
||
| /* | ||
| ** Sign-extend a 11-bits value to a signed 32-bit value. | ||
| */ | ||
| static inline | ||
| int32_t | ||
| sign_extend11( | ||
| uint32_t value | ||
| ) { | ||
| if ((value & 0x400) != 0) { | ||
| return ((int32_t)(value | 0xFFFFF800)); | ||
| } else { | ||
| return ((int32_t)value); | ||
| } | ||
| } | ||
|
|
||
| /* | ||
| ** Sign-extend a 12-bits value to a signed 32-bit value. | ||
| */ | ||
| static inline | ||
| int32_t | ||
| sign_extend12( | ||
| uint32_t value | ||
| ) { | ||
| if ((value & 0x800) != 0) { | ||
| return ((int32_t)(value | 0xFFFFF000)); | ||
| } else { | ||
| return ((int32_t)value); | ||
| } | ||
| } | ||
|
|
||
| /* | ||
| ** Sign-extend a 24-bits value to a signed 32-bit value. | ||
| */ | ||
| static inline | ||
| int32_t | ||
| sign_extend24( | ||
| uint32_t value | ||
| ) { | ||
| if ((value & 0x800000) != 0) { | ||
| return ((int32_t)(value | 0xFF000000)); | ||
| } else { | ||
| return ((int32_t)value); | ||
| } | ||
| } | ||
|
|
||
| /* | ||
| ** Sign-extend a 28-bits value to a signed 32-bit value. | ||
| */ | ||
| static inline | ||
| int32_t | ||
| sign_extend28( | ||
| uint32_t value | ||
| ) { | ||
| if ((value & 0x08000000) != 0) { | ||
| return ((int32_t)(value | 0xF0000000)); | ||
| } else { | ||
| return ((int32_t)value); | ||
| } | ||
| } | ||
|
|
||
| /* | ||
| ** Return the value of the carry bit when performing `a + b + c`. | ||
| */ | ||
| static inline | ||
| bool | ||
| uadd32( | ||
| uint32_t a, | ||
| uint32_t b, | ||
| uint32_t c | ||
| ) { | ||
| uint64_t r; | ||
|
|
||
| r = (uint64_t)a + (uint64_t)b + (uint64_t)c; | ||
| return (r > UINT32_MAX); | ||
| } | ||
|
|
||
| /* | ||
| ** Return the value of the overflow bit when performing `a + b + c`. | ||
| */ | ||
| static inline | ||
| bool | ||
| iadd32( | ||
| int32_t a, | ||
| int32_t b, | ||
| int32_t c | ||
| ) { | ||
| int64_t r; | ||
|
|
||
| r = (int64_t)a + (int64_t)b + (int64_t)c; | ||
| return ((r < INT32_MIN) | (r > INT32_MAX)); | ||
| } | ||
|
|
||
| /* | ||
| ** Return the value of the borrow bit when performing `a - b - c`. | ||
| */ | ||
| static inline | ||
| bool | ||
| usub32( | ||
| uint32_t a, | ||
| uint32_t b, | ||
| uint32_t c | ||
| ) { | ||
| uint64_t r; | ||
|
|
||
| r = (uint64_t)a - (uint64_t)b -(uint64_t)c; | ||
| return (r <= UINT32_MAX); | ||
| } | ||
|
|
||
| /* | ||
| ** Return the value of the overflow bit when performing `a - b - c`. | ||
| */ | ||
| static inline | ||
| bool | ||
| isub32( | ||
| int32_t a, | ||
| int32_t b, | ||
| int32_t c | ||
| ) { | ||
| int64_t r; | ||
|
|
||
| r = (int64_t)a - (int64_t)b - (int64_t)c; | ||
| return ((r < INT32_MIN) | (r > INT32_MAX)); | ||
| } | ||
|
|
||
| /* | ||
| ** Return the value of value after being wrapped by `shift` amount. | ||
| */ | ||
| static inline | ||
| uint32_t | ||
| ror32( | ||
| uint32_t value, | ||
| uint32_t shift | ||
| ) { | ||
| if (shift) { | ||
| return ((value >> shift) | (value << (32 - shift))); | ||
| } else { | ||
| return (value); | ||
| } | ||
| } |
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