glasm: Implement int64 add and subtract

src/shader_recompiler/backend/glasm/emit_glasm_instructions.h

@@ -299,9 +299,9 @@ void EmitFPIsNan16(EmitContext& ctx, Register value);
 void EmitFPIsNan32(EmitContext& ctx, IR::Inst& inst, ScalarF32 value);
 void EmitFPIsNan64(EmitContext& ctx, IR::Inst& inst, ScalarF64 value);
 void EmitIAdd32(EmitContext& ctx, IR::Inst& inst, ScalarS32 a, ScalarS32 b);
-void EmitIAdd64(EmitContext& ctx, Register a, Register b);
+void EmitIAdd64(EmitContext& ctx, IR::Inst& inst, Register a, Register b);
 void EmitISub32(EmitContext& ctx, IR::Inst& inst, ScalarS32 a, ScalarS32 b);
-void EmitISub64(EmitContext& ctx, Register a, Register b);
+void EmitISub64(EmitContext& ctx, IR::Inst& inst, Register a, Register b);
 void EmitIMul32(EmitContext& ctx, IR::Inst& inst, ScalarS32 a, ScalarS32 b);
 void EmitINeg32(EmitContext& ctx, IR::Inst& inst, ScalarS32 value);
 void EmitINeg64(EmitContext& ctx, IR::Inst& inst, Register value);

src/shader_recompiler/backend/glasm/emit_glasm_integer.cpp

@@ -37,18 +37,16 @@ void EmitIAdd32(EmitContext& ctx, IR::Inst& inst, ScalarS32 a, ScalarS32 b) {
     }
 }
 
-void EmitIAdd64([[maybe_unused]] EmitContext& ctx, [[maybe_unused]] Register a,
-                [[maybe_unused]] Register b) {
-    throw NotImplementedException("GLASM instruction");
+void EmitIAdd64(EmitContext& ctx, IR::Inst& inst, Register a, Register b) {
+    ctx.LongAdd("ADD.S64 {}.x,{}.x,{}.x;", inst, a, b);
 }
 
 void EmitISub32(EmitContext& ctx, IR::Inst& inst, ScalarS32 a, ScalarS32 b) {
     ctx.Add("SUB.S {}.x,{},{};", inst, a, b);
 }
 
-void EmitISub64([[maybe_unused]] EmitContext& ctx, [[maybe_unused]] Register a,
-                [[maybe_unused]] Register b) {
-    throw NotImplementedException("GLASM instruction");
+void EmitISub64(EmitContext& ctx, IR::Inst& inst, Register a, Register b) {
+    ctx.LongAdd("SUB.S64 {}.x,{}.x,{}.x;", inst, a, b);
 }
 
 void EmitIMul32(EmitContext& ctx, IR::Inst& inst, ScalarS32 a, ScalarS32 b) {