1 files changed, 137 insertions, 0 deletions
diff --git a/src/Ryujinx.Cpu/LightningJit/Arm32/ImmUtils.cs b/src/Ryujinx.Cpu/LightningJit/Arm32/ImmUtils.cs
new file mode 100644
index 00000000..516845fc
--- /dev/null
+++ b/src/Ryujinx.Cpu/LightningJit/Arm32/ImmUtils.cs
@@ -0,0 +1,137 @@
+using System.Numerics;
+
+namespace Ryujinx.Cpu.LightningJit.Arm32
+{
+    static class ImmUtils
+    {
+        public static uint ExpandImm(uint imm)
+        {
+            return BitOperations.RotateRight((byte)imm, (int)(imm >> 8) * 2);
+        }
+
+        public static bool ExpandedImmRotated(uint imm)
+        {
+            return (imm >> 8) != 0;
+        }
+
+        public static uint ExpandImm(uint imm8, uint imm3, uint i)
+        {
+            uint imm = CombineImmU12(imm8, imm3, i);
+
+            if (imm >> 10 == 0)
+            {
+                return ((imm >> 8) & 3) switch
+                {
+                    0 => (byte)imm,
+                    1 => (byte)imm * 0x00010001u,
+                    2 => (byte)imm * 0x01000100u,
+                    3 => (byte)imm * 0x01010101u,
+                    _ => 0,
+                };
+            }
+            else
+            {
+                return BitOperations.RotateRight(0x80u | (byte)imm, (int)(imm >> 7));
+            }
+        }
+
+        public static bool ExpandedImmRotated(uint imm8, uint imm3, uint i)
+        {
+            uint imm = CombineImmU12(imm8, imm3, i);
+
+            return (imm >> 7) != 0;
+        }
+
+        public static uint CombineImmU5(uint imm2, uint imm3)
+        {
+            return imm2 | (imm3 << 2);
+        }
+
+        public static uint CombineImmU5IImm4(uint i, uint imm4)
+        {
+            return i | (imm4 << 1);
+        }
+
+        public static uint CombineImmU8(uint imm4l, uint imm4h)
+        {
+            return imm4l | (imm4h << 4);
+        }
+
+        public static uint CombineImmU8(uint imm4, uint imm3, uint i)
+        {
+            return imm4 | (imm3 << 4) | (i << 7);
+        }
+
+        public static uint CombineImmU12(uint imm8, uint imm3, uint i)
+        {
+            return imm8 | (imm3 << 8) | (i << 11);
+        }
+
+        public static uint CombineImmU16(uint imm12, uint imm4)
+        {
+            return imm12 | (imm4 << 12);
+        }
+
+        public static uint CombineImmU16(uint imm8, uint imm3, uint i, uint imm4)
+        {
+            return imm8 | (imm3 << 8) | (i << 11) | (imm4 << 12);
+        }
+
+        public static int CombineSImm20Times2(uint imm11, uint imm6, uint j1, uint j2, uint s)
+        {
+            int imm32 = (int)(imm11 | (imm6 << 11) | (j1 << 17) | (j2 << 18) | (s << 19));
+
+            return (imm32 << 13) >> 12;
+        }
+
+        public static int CombineSImm24Times2(uint imm11, uint imm10, uint j1, uint j2, uint s)
+        {
+            uint i1 = j1 ^ s ^ 1;
+            uint i2 = j2 ^ s ^ 1;
+
+            int imm32 = (int)(imm11 | (imm10 << 11) | (i2 << 21) | (i1 << 22) | (s << 23));
+
+            return (imm32 << 8) >> 7;
+        }
+
+        public static int CombineSImm24Times4(uint imm10L, uint imm10H, uint j1, uint j2, uint s)
+        {
+            uint i1 = j1 ^ s ^ 1;
+            uint i2 = j2 ^ s ^ 1;
+
+            int imm32 = (int)(imm10L | (imm10H << 10) | (i2 << 20) | (i1 << 21) | (s << 22));
+
+            return (imm32 << 9) >> 7;
+        }
+
+        public static uint CombineRegisterList(uint registerList, uint m)
+        {
+            return registerList | (m << 14);
+        }
+
+        public static uint CombineRegisterList(uint registerList, uint m, uint p)
+        {
+            return registerList | (m << 14) | (p << 15);
+        }
+
+        public static int ExtractSImm24Times4(uint encoding)
+        {
+            return (int)(encoding << 8) >> 6;
+        }
+
+        public static int ExtractT16UImm5Times2(uint encoding)
+        {
+            return (int)(encoding >> 18) & 0x3e;
+        }
+
+        public static int ExtractT16SImm8Times2(uint encoding)
+        {
+            return (int)(encoding << 24) >> 23;
+        }
+
+        public static int ExtractT16SImm11Times2(uint encoding)
+        {
+            return (int)(encoding << 21) >> 20;
+        }
+    }
+}