qbe: Handle K&R function definition argument promotion

Parameters for K&R function definitions that are affected by default
argument promotion are passed as their promoted type, so need to be
converted back before storing into memory allocated for the parameter.

1 files changed, 18 insertions, 0 deletions

diff --git a/test/kr-function-argument-promotion.qbe b/test/kr-function-argument-promotion.qbe
new file mode 100644
index 0000000..6d2f2b8
--- /dev/null
+++ b/test/kr-function-argument-promotion.qbe
@@ -0,0 +1,18 @@
+export
+function w $f(w %.1) {
+@start.1
+	%.2 =w extub %.1
+	%.3 =l alloc4 1
+	storeb %.2, %.3
+@body.2
+	%.4 =w loadub %.3
+	%.5 =w extub %.4
+	ret %.5
+}
+export
+function w $main() {
+@start.3
+@body.4
+	%.1 =w call $f(w 256)
+	ret %.1
+}