[llvm] When storing valuetypes received in registers to the stack, st…

…ore only the value parts of the register, the upper bits might container garbage.

mono/mini/mini-llvm.c

@@ -2113,7 +2113,7 @@ emit_args_to_vtype (EmitContext *ctx, LLVMBuilderRef builder, MonoType *t, LLVMV
 {
 	int j, size, nslots;
 
-	size = get_vtype_size (t);
+	size = mono_class_value_size (mono_class_from_mono_type (t), NULL);
 
 	if (MONO_CLASS_IS_SIMD (ctx->cfg, mono_class_from_mono_type (t))) {
 		address = LLVMBuildBitCast (ctx->builder, address, LLVMPointerType (LLVMInt8Type (), 0), "");
@@ -2129,6 +2129,9 @@ emit_args_to_vtype (EmitContext *ctx, LLVMBuilderRef builder, MonoType *t, LLVMV
 		int part_size = size > sizeof (gpointer) ? sizeof (gpointer) : size;
 		LLVMTypeRef part_type;
 
+		while (part_size != 1 && part_size != 2 && part_size != 4 && part_size < 8)
+			part_size ++;
+
 		if (ainfo->pair_storage [j] == LLVMArgNone)
 			continue;
 
@@ -4171,9 +4174,6 @@ process_bb (EmitContext *ctx, MonoBasicBlock *bb)
 			case LLVMArgVtypeAsScalar: {
 				LLVMTypeRef ret_type = LLVMGetReturnType (LLVMGetElementType (LLVMTypeOf (method)));
 				LLVMValueRef retval;
-				int size;
-
-				size = get_vtype_size (sig->ret);
 
 				g_assert (addresses [ins->sreg1]);
 

mono/mini/mini.h

@@ -761,6 +761,7 @@ typedef enum {
 	LLVMArgInIReg,
 	/* Only in ainfo->pair_storage */
 	LLVMArgInFPReg,
+	/* Valuetype passed in 1-2 consecutive register */
 	LLVMArgVtypeInReg,
 	LLVMArgVtypeByVal,
 	LLVMArgVtypeRetAddr, /* On on cinfo->ret */