arch-vega: Implement V_LSHL_ADD_U32

Change-Id: I986f82e8c6c02b0d62e55fbaed1c3f9e5b2b4a43
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/53865
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/arch/amdgpu/vega/decoder.cc

@@ -6927,8 +6927,7 @@ namespace VegaISA
     GPUStaticInst*
     Decoder::decode_OPU_VOP3__V_LSHL_ADD_U32(MachInst iFmt)
     {
-        fatal("Trying to decode instruction without a class\n");
-        return nullptr;
+        return new Inst_VOP3__V_LSHL_ADD_U32(&iFmt->iFmt_VOP3A);
     }
 
     GPUStaticInst*

src/arch/amdgpu/vega/insts/instructions.cc

@@ -32004,6 +32004,52 @@ namespace VegaISA
         vcc.write();
         vdst.write();
     } // execute
+    // --- Inst_VOP3__V_LSHL_ADD_U32 class methods ---
+
+    Inst_VOP3__V_LSHL_ADD_U32::Inst_VOP3__V_LSHL_ADD_U32(InFmt_VOP3A *iFmt)
+        : Inst_VOP3A(iFmt, "v_lshl_add_u32", false)
+    {
+        setFlag(ALU);
+    } // Inst_VOP3__V_LSHL_ADD_U32
+
+    Inst_VOP3__V_LSHL_ADD_U32::~Inst_VOP3__V_LSHL_ADD_U32()
+    {
+    } // ~Inst_VOP3__V_LSHL_ADD_U32
+
+    // --- description from .arch file ---
+    // D.u = (S0.u << S1.u[4:0]) + S2.u.
+    void
+    Inst_VOP3__V_LSHL_ADD_U32::execute(GPUDynInstPtr gpuDynInst)
+    {
+        Wavefront *wf = gpuDynInst->wavefront();
+        ConstVecOperandU32 src0(gpuDynInst, extData.SRC0);
+        ConstVecOperandU32 src1(gpuDynInst, extData.SRC1);
+        ConstVecOperandU32 src2(gpuDynInst, extData.SRC2);
+        VecOperandU32 vdst(gpuDynInst, instData.VDST);
+
+        src0.readSrc();
+        src1.readSrc();
+        src2.readSrc();
+
+        /**
+         * input modifiers are supported by FP operations only
+         */
+        assert(!(instData.ABS & 0x1));
+        assert(!(instData.ABS & 0x2));
+        assert(!(instData.ABS & 0x4));
+        assert(!(extData.NEG & 0x1));
+        assert(!(extData.NEG & 0x2));
+        assert(!(extData.NEG & 0x4));
+
+        for (int lane = 0; lane < NumVecElemPerVecReg; ++lane) {
+            if (wf->execMask(lane)) {
+                vdst[lane] = (src0[lane] << bits(src1[lane], 4, 0))
+                           + src2[lane];
+            }
+        }
+
+        vdst.write();
+    } // execute
     // --- Inst_VOP3__V_LSHL_OR_B32 class methods ---
 
     Inst_VOP3__V_LSHL_OR_B32::Inst_VOP3__V_LSHL_OR_B32(InFmt_VOP3A *iFmt)

src/arch/amdgpu/vega/insts/instructions.hh

@@ -29496,6 +29496,42 @@ namespace VegaISA
         void execute(GPUDynInstPtr) override;
     }; // Inst_VOP3__V_MAD_I64_I32
 
+    class Inst_VOP3__V_LSHL_ADD_U32 : public Inst_VOP3A
+    {
+      public:
+        Inst_VOP3__V_LSHL_ADD_U32(InFmt_VOP3A*);
+        ~Inst_VOP3__V_LSHL_ADD_U32();
+
+        int
+        getNumOperands() override
+        {
+            return numDstRegOperands() + numSrcRegOperands();
+        } // getNumOperands
+
+        int numDstRegOperands() override { return 1; }
+        int numSrcRegOperands() override { return 3; }
+
+        int
+        getOperandSize(int opIdx) override
+        {
+            switch (opIdx) {
+              case 0: //src_0
+                return 4;
+              case 1: //src_1
+                return 4;
+              case 2: //src_2
+                return 4;
+              case 3: //vdst
+                return 4;
+              default:
+                fatal("op idx %i out of bounds\n", opIdx);
+                return -1;
+            }
+        } // getOperandSize
+
+        void execute(GPUDynInstPtr) override;
+    }; // Inst_VOP3__V_LSHL_ADD_U32
+
     class Inst_VOP3__V_LSHL_OR_B32 : public Inst_VOP3A
     {
       public: