[jit] Add a intrinsic for ThrowForUnsupportedVectorBaseType<T>. (#39965)

Part of https://github.com/dotnet/runtime/issues/38718.

diff --git a/src/mono/mono/mini/intrinsics.c b/src/mono/mono/mini/intrinsics.c
index 6f6d93b..cf8bcc9 100644 (file)
--- a/src/mono/mono/mini/intrinsics.c
+++ b/src/mono/mono/mini/intrinsics.c
@@ -1948,6 +1948,34 @@ mini_emit_inst_for_method (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSign
                }
        }
 
+       if (in_corlib &&
+               !strcmp ("System", cmethod_klass_name_space) &&
+               !strcmp ("ThrowHelper", cmethod_klass_name) &&
+               !strcmp ("ThrowForUnsupportedVectorBaseType", cmethod->name)) {
+               /* The mono JIT can't optimize the body of this method away */
+               MonoGenericContext *ctx = mono_method_get_context (cmethod);
+               g_assert (ctx);
+               g_assert (ctx->method_inst);
+
+               MonoType *t = ctx->method_inst->type_argv [0];
+               switch (t->type) {
+               case MONO_TYPE_I1:
+               case MONO_TYPE_U1:
+               case MONO_TYPE_I2:
+               case MONO_TYPE_U2:
+               case MONO_TYPE_I4:
+               case MONO_TYPE_U4:
+               case MONO_TYPE_I8:
+               case MONO_TYPE_U8:
+               case MONO_TYPE_R4:
+               case MONO_TYPE_R8:
+                       MONO_INST_NEW (cfg, ins, OP_NOP);
+                       MONO_ADD_INS (cfg->cbb, ins);
+                       return ins;
+               default:
+                       break;
+               }
+       }
 #endif
 
        ins = mono_emit_native_types_intrinsics (cfg, cmethod, fsig, args);