Add SSAT, SSAT16, USAT and USAT16 ARM32 instructions (#954)

* Implement SMULWB, SMULWT, SMLAWB, SMLAWT, and add tests for some multiply instructions

* Improve test descriptions

* Rename SMULH to SMUL__

* Add SSAT, SSAT16, USAT and USAT16 ARM32 instructions

* Fix new tests

* Replace AND 0xFFFF with 16-bits zero extension (more efficient)

1 files changed, 55 insertions, 0 deletions

diff --git a/Ryujinx.Tests/Cpu/CpuTestAlu32.cs b/Ryujinx.Tests/Cpu/CpuTestAlu32.cs
index 145417ae..c21bbe10 100644
--- a/Ryujinx.Tests/Cpu/CpuTestAlu32.cs
+++ b/Ryujinx.Tests/Cpu/CpuTestAlu32.cs
@@ -11,6 +11,26 @@ namespace Ryujinx.Tests.Cpu
 #if Alu32
 
 #region "ValueSource (Opcodes)"
+        private static uint[] _Ssat_Usat_()
+        {
+            return new uint[]
+            {
+                0xe6a00010u, // SSAT R0, #1, R0, LSL #0
+                0xe6a00050u, // SSAT R0, #1, R0, ASR #32
+                0xe6e00010u, // USAT R0, #0, R0, LSL #0
+                0xe6e00050u  // USAT R0, #0, R0, ASR #32
+            };
+        }
+
+        private static uint[] _Ssat16_Usat16_()
+        {
+            return new uint[]
+            {
+                0xe6a00f30u, // SSAT16 R0, #1, R0
+                0xe6e00f30u, // USAT16 R0, #0, R0
+            };
+        }
+
         private static uint[] _Lsr_Lsl_Asr_Ror_()
         {
             return new uint[]
@@ -56,6 +76,41 @@ namespace Ryujinx.Tests.Cpu
 
             CompareAgainstUnicorn();
         }
+
+        [Test, Pairwise]
+        public void Ssat_Usat([ValueSource("_Ssat_Usat_")] uint opcode,
+                              [Values(0u, 0xdu)] uint rd,
+                              [Values(1u, 0xdu)] uint rn,
+                              [Values(0u, 7u, 8u, 0xfu, 0x10u, 0x1fu)] uint sat,
+                              [Values(0u, 7u, 8u, 0xfu, 0x10u, 0x1fu)] uint shift,
+                              [Values(0x00000000u, 0x7FFFFFFFu,
+                                      0x80000000u, 0xFFFFFFFFu)] [Random(RndCnt)] uint wn)
+        {
+            opcode |= ((rn & 15) << 0) | ((shift & 31) << 7) | ((rd & 15) << 12) | ((sat & 31) << 16);
+
+            uint w31 = TestContext.CurrentContext.Random.NextUInt();
+
+            SingleOpcode(opcode, r1: wn, sp: w31);
+
+            CompareAgainstUnicorn();
+        }
+
+        [Test, Pairwise]
+        public void Ssat16_Usat16([ValueSource("_Ssat16_Usat16_")] uint opcode,
+                                  [Values(0u, 0xdu)] uint rd,
+                                  [Values(1u, 0xdu)] uint rn,
+                                  [Values(0u, 7u, 8u, 0xfu)] uint sat,
+                                  [Values(0x00000000u, 0x7FFFFFFFu,
+                                          0x80000000u, 0xFFFFFFFFu)] [Random(RndCnt)] uint wn)
+        {
+            opcode |= ((rn & 15) << 0) | ((rd & 15) << 12) | ((sat & 15) << 16);
+
+            uint w31 = TestContext.CurrentContext.Random.NextUInt();
+
+            SingleOpcode(opcode, r1: wn, sp: w31);
+
+            CompareAgainstUnicorn();
+        }
 #endif
     }
 }