From a0c394bdd0f0c554f504ee8119e8304551653562 Mon Sep 17 00:00:00 2001
From: Michael Forney <mforney@mforney.org>
Date: Wed, 13 Feb 2019 15:28:40 -0800
Subject: Implement __builtin_va_arg

---
 tests/varargs.c   | 12 ++++++++++++
 tests/varargs.qbe | 22 ++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 tests/varargs.c
 create mode 100644 tests/varargs.qbe

(limited to 'tests')

diff --git a/tests/varargs.c b/tests/varargs.c
new file mode 100644
index 0000000..0b5a73d
--- /dev/null
+++ b/tests/varargs.c
@@ -0,0 +1,12 @@
+void f(int n, ...) {
+	__builtin_va_list ap;
+
+	__builtin_va_start(ap, n);
+	while (n) {
+		__builtin_va_arg(ap, int);
+		__builtin_va_arg(ap, float);
+		__builtin_va_arg(ap, char *);
+		--n;
+	}
+	__builtin_va_end(ap);
+}
diff --git a/tests/varargs.qbe b/tests/varargs.qbe
new file mode 100644
index 0000000..16db877
--- /dev/null
+++ b/tests/varargs.qbe
@@ -0,0 +1,22 @@
+export
+function $f(w %.1, ...) {
+@start.1
+	%.2 =l alloc4 4
+	storew %.1, %.2
+	%.3 =l alloc8 24
+@body.2
+	vastart %.3
+@while_cond.3
+	%.4 =w loadsw %.2
+	jnz %.4, @while_body.4, @while_join.5
+@while_body.4
+	%.5 =w vaarg %.3
+	%.6 =s vaarg %.3
+	%.7 =l vaarg %.3
+	%.8 =w loadsw %.2
+	%.9 =w sub %.8, 1
+	storew %.9, %.2
+	jmp @while_cond.3
+@while_join.5
+	ret
+}
-- 
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