From fa72c754c513e1a681e3df59c87573af59656afd Mon Sep 17 00:00:00 2001
From: Zoltan Varga <vargaz@gmail.com>
Date: Mon, 27 Jul 2020 20:20:28 -0400
Subject: [PATCH] [jit] Add a intrinsic for
 ThrowForUnsupportedVectorBaseType<T>. (#39965)

Part of https://github.com/dotnet/runtime/issues/38718.
---
 src/mono/mono/mini/intrinsics.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/src/mono/mono/mini/intrinsics.c b/src/mono/mono/mini/intrinsics.c
index 6f6d93b..cf8bcc9 100644
--- 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);
-- 
2.7.4