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Diffstat (limited to '')
| -rw-r--r-- | src/core/arm/skyeye_common/armsupp.cpp | 189 |
1 files changed, 0 insertions, 189 deletions
diff --git a/src/core/arm/skyeye_common/armsupp.cpp b/src/core/arm/skyeye_common/armsupp.cpp deleted file mode 100644 index 06aa1b075..000000000 --- a/src/core/arm/skyeye_common/armsupp.cpp +++ /dev/null @@ -1,189 +0,0 @@ -/* armsupp.c -- ARMulator support code: ARM6 Instruction Emulator. - Copyright (C) 1994 Advanced RISC Machines Ltd. - - This program 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 2 of the License, or - (at your option) any later version. - - 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. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#include "common/logging/log.h" -#include "core/arm/skyeye_common/arm_regformat.h" -#include "core/arm/skyeye_common/armstate.h" -#include "core/arm/skyeye_common/armsupp.h" - -// Unsigned sum of absolute difference -u8 ARMul_UnsignedAbsoluteDifference(u8 left, u8 right) { - if (left > right) - return left - right; - - return right - left; -} - -// Add with carry, indicates if a carry-out or signed overflow occurred. -u32 AddWithCarry(u32 left, u32 right, u32 carry_in, bool* carry_out_occurred, - bool* overflow_occurred) { - u64 unsigned_sum = (u64)left + (u64)right + (u64)carry_in; - s64 signed_sum = (s64)(s32)left + (s64)(s32)right + (s64)carry_in; - u64 result = (unsigned_sum & 0xFFFFFFFF); - - if (carry_out_occurred) - *carry_out_occurred = (result != unsigned_sum); - - if (overflow_occurred) - *overflow_occurred = ((s64)(s32)result != signed_sum); - - return (u32)result; -} - -// Compute whether an addition of A and B, giving RESULT, overflowed. -bool AddOverflow(u32 a, u32 b, u32 result) { - return ((NEG(a) && NEG(b) && POS(result)) || (POS(a) && POS(b) && NEG(result))); -} - -// Compute whether a subtraction of A and B, giving RESULT, overflowed. -bool SubOverflow(u32 a, u32 b, u32 result) { - return ((NEG(a) && POS(b) && POS(result)) || (POS(a) && NEG(b) && NEG(result))); -} - -// Returns true if the Q flag should be set as a result of overflow. -bool ARMul_AddOverflowQ(u32 a, u32 b) { - u32 result = a + b; - if (((result ^ a) & (u32)0x80000000) && ((a ^ b) & (u32)0x80000000) == 0) - return true; - - return false; -} - -// 8-bit signed saturated addition -u8 ARMul_SignedSaturatedAdd8(u8 left, u8 right) { - u8 result = left + right; - - if (((result ^ left) & 0x80) && ((left ^ right) & 0x80) == 0) { - if (left & 0x80) - result = 0x80; - else - result = 0x7F; - } - - return result; -} - -// 8-bit signed saturated subtraction -u8 ARMul_SignedSaturatedSub8(u8 left, u8 right) { - u8 result = left - right; - - if (((result ^ left) & 0x80) && ((left ^ right) & 0x80) != 0) { - if (left & 0x80) - result = 0x80; - else - result = 0x7F; - } - - return result; -} - -// 16-bit signed saturated addition -u16 ARMul_SignedSaturatedAdd16(u16 left, u16 right) { - u16 result = left + right; - - if (((result ^ left) & 0x8000) && ((left ^ right) & 0x8000) == 0) { - if (left & 0x8000) - result = 0x8000; - else - result = 0x7FFF; - } - - return result; -} - -// 16-bit signed saturated subtraction -u16 ARMul_SignedSaturatedSub16(u16 left, u16 right) { - u16 result = left - right; - - if (((result ^ left) & 0x8000) && ((left ^ right) & 0x8000) != 0) { - if (left & 0x8000) - result = 0x8000; - else - result = 0x7FFF; - } - - return result; -} - -// 8-bit unsigned saturated addition -u8 ARMul_UnsignedSaturatedAdd8(u8 left, u8 right) { - u8 result = left + right; - - if (result < left) - result = 0xFF; - - return result; -} - -// 16-bit unsigned saturated addition -u16 ARMul_UnsignedSaturatedAdd16(u16 left, u16 right) { - u16 result = left + right; - - if (result < left) - result = 0xFFFF; - - return result; -} - -// 8-bit unsigned saturated subtraction -u8 ARMul_UnsignedSaturatedSub8(u8 left, u8 right) { - if (left <= right) - return 0; - - return left - right; -} - -// 16-bit unsigned saturated subtraction -u16 ARMul_UnsignedSaturatedSub16(u16 left, u16 right) { - if (left <= right) - return 0; - - return left - right; -} - -// Signed saturation. -u32 ARMul_SignedSatQ(s32 value, u8 shift, bool* saturation_occurred) { - const u32 max = (1 << shift) - 1; - const s32 top = (value >> shift); - - if (top > 0) { - *saturation_occurred = true; - return max; - } else if (top < -1) { - *saturation_occurred = true; - return ~max; - } - - *saturation_occurred = false; - return (u32)value; -} - -// Unsigned saturation -u32 ARMul_UnsignedSatQ(s32 value, u8 shift, bool* saturation_occurred) { - const u32 max = (1 << shift) - 1; - - if (value < 0) { - *saturation_occurred = true; - return 0; - } else if ((u32)value > max) { - *saturation_occurred = true; - return max; - } - - *saturation_occurred = false; - return (u32)value; -} |