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author | bunnei <bunneidev@gmail.com> | 2014-12-27 21:15:13 -0500 |
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committer | bunnei <bunneidev@gmail.com> | 2014-12-27 21:15:13 -0500 |
commit | 3422d81f053578e2a6806dc9ffa33c50f2c0b66d (patch) | |
tree | 16621bd2dabe32e4a17f0014392c6c8f597e9a56 /src/core/arm/interpreter/armsupp.cpp | |
parent | 28e64806cd276b3b763e57a5dc026ba153689c88 (diff) | |
parent | af69b0840b67328f23a8123e4a6dec9c11eada96 (diff) |
Merge pull request #350 from lioncash/qops
Implement the rest of the UQ* ops.
Diffstat (limited to 'src/core/arm/interpreter/armsupp.cpp')
-rw-r--r-- | src/core/arm/interpreter/armsupp.cpp | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/core/arm/interpreter/armsupp.cpp b/src/core/arm/interpreter/armsupp.cpp index 6774f8a7..186b1bd7 100644 --- a/src/core/arm/interpreter/armsupp.cpp +++ b/src/core/arm/interpreter/armsupp.cpp @@ -469,6 +469,47 @@ ARMul_SubOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result) ASSIGNV (SubOverflow (a, b, 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; +} + + /* This function does the work of generating the addresses used in an LDC instruction. The code here is always post-indexed, it's up to the caller to get the input address correct and to handle base register |