new vararg test

llvm-svn: 22252

llvm/test/Feature/varargs_new.ll

@@ -0,0 +1,33 @@
+; RUN: llvm-as %s -o - | llvm-dis > %t1.ll
+; RUN: llvm-as %t1.ll -o - | llvm-dis > %t2.ll
+; RUN: diff %t1.ll %t2.ll
+
+; Demonstrate all of the variable argument handling intrinsic functions plus 
+; the va_arg instruction.
+
+implementation   ; Functions:
+declare void %llvm.va_start(sbyte**)
+declare void %llvm.va_copy(sbyte**, sbyte*)
+declare void %llvm.va_end(sbyte**)
+
+int %test(int %X, ...) {
+        ; Allocate two va_list items.  On this target, va_list is of type sbyte*
+        %ap = alloca sbyte*             ; <sbyte**> [#uses=4]
+        %aq = alloca sbyte*             ; <sbyte**> [#uses=2]
+
+        ; Initialize variable argument processing
+        call void %llvm.va_start(sbyte** %ap)
+
+        ; Read a single integer argument
+        %tmp = vaarg sbyte** %ap, int           ; <int> [#uses=1]
+
+        ; Demonstrate usage of llvm.va_copy and llvm_va_end
+        %apv = load sbyte** %ap         ; <sbyte*> [#uses=1]
+        call void %llvm.va_copy(sbyte** %aq, sbyte* %apv)
+        call void %llvm.va_end(sbyte** %aq)
+
+        ; Stop processing of arguments.
+        call void %llvm.va_end(sbyte** %ap)
+        ret int %tmp
+
+}