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| author | gdkchan <gab.dark.100@gmail.com> | 2024-01-20 11:11:28 -0300 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-01-20 11:11:28 -0300 |
| commit | 427b7d06b5ab6d2b06784a9d283eaf836a04c27e (patch) | |
| tree | b69b500432626c89f6a4b7171a948b46c46b3723 /src/Ryujinx.Cpu/LightningJit/CodeGen/Arm64/CodeGenCommon.cs | |
| parent | 331c07807fd0db5d4452d6ef02962a6d19a56d7f (diff) | |
Implement a new JIT for Arm devices (#6057)1.1.1117
* Implement a new JIT for Arm devices
* Auto-format
* Make a lot of Assembler members read-only
* More read-only
* Fix more warnings
* ObjectDisposedException.ThrowIf
* New JIT cache for platforms that enforce W^X, currently unused
* Remove unused using
* Fix assert
* Pass memory manager type around
* Safe memory manager mode support + other improvements
* Actual safe memory manager mode masking support
* PR feedback
Diffstat (limited to 'src/Ryujinx.Cpu/LightningJit/CodeGen/Arm64/CodeGenCommon.cs')
| -rw-r--r-- | src/Ryujinx.Cpu/LightningJit/CodeGen/Arm64/CodeGenCommon.cs | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/Ryujinx.Cpu/LightningJit/CodeGen/Arm64/CodeGenCommon.cs b/src/Ryujinx.Cpu/LightningJit/CodeGen/Arm64/CodeGenCommon.cs new file mode 100644 index 00000000..db6a7159 --- /dev/null +++ b/src/Ryujinx.Cpu/LightningJit/CodeGen/Arm64/CodeGenCommon.cs @@ -0,0 +1,67 @@ +using System.Numerics; + +namespace Ryujinx.Cpu.LightningJit.CodeGen.Arm64 +{ + static class CodeGenCommon + { + public static bool TryEncodeBitMask(Operand operand, out int immN, out int immS, out int immR) + { + return TryEncodeBitMask(operand.Type, operand.Value, out immN, out immS, out immR); + } + + public static bool TryEncodeBitMask(OperandType type, ulong value, out int immN, out int immS, out int immR) + { + if (type == OperandType.I32) + { + value &= uint.MaxValue; + value |= value << 32; + } + + return TryEncodeBitMask(value, out immN, out immS, out immR); + } + + public static bool TryEncodeBitMask(ulong value, out int immN, out int immS, out int immR) + { + // Some special values also can't be encoded: + // 0 can't be encoded because we need to subtract 1 from onesCount (which would became negative if 0). + // A value with all bits set can't be encoded because it is reserved according to the spec, because: + // Any value AND all ones will be equal itself, so it's effectively a no-op. + // Any value OR all ones will be equal all ones, so one can just use MOV. + // Any value XOR all ones will be equal its inverse, so one can just use MVN. + if (value == 0 || value == ulong.MaxValue) + { + immN = 0; + immS = 0; + immR = 0; + + return false; + } + + // Normalize value, rotating it such that the LSB is 1: Ensures we get a complete element that has not + // been cut-in-half across the word boundary. + int rotation = BitOperations.TrailingZeroCount(value & (value + 1)); + ulong rotatedValue = ulong.RotateRight(value, rotation); + + // Now that we have a complete element in the LSB with the LSB = 1, determine size and number of ones + // in element. + int elementSize = BitOperations.TrailingZeroCount(rotatedValue & (rotatedValue + 1)); + int onesInElement = BitOperations.TrailingZeroCount(~rotatedValue); + + // Check the value is repeating; also ensures element size is a power of two. + if (ulong.RotateRight(value, elementSize) != value) + { + immN = 0; + immS = 0; + immR = 0; + + return false; + } + + immN = (elementSize >> 6) & 1; + immS = (((~elementSize + 1) << 1) | (onesInElement - 1)) & 0x3f; + immR = (elementSize - rotation) & (elementSize - 1); + + return true; + } + } +} |