Merge remote-tracking branch 'upstream/mob'

Author: TheTechsTech

arm64-gen.c

@@ -1101,6 +1101,9 @@ ST_FUNC void gfunc_call(int nb_args)
             // value in floating-point registers
             if ((vtop->type.t & VT_BTYPE) == VT_STRUCT) {
                 uint32_t j, sz, n = arm64_hfa(&vtop->type, &sz);
+                // save regs because struct may overwrite previous func call result
+                save_regs(0);
+
                 vtop->type.t = VT_PTR;
                 gaddrof();
                 gv(RC_R30);

tests/tests2/137_funcall_struct_args.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+
+// arm64-gen.c: gfunc_call() Second pass when struct args may overwrite previous func call result
+struct vec {
+        float x;
+        float y;
+};
+
+void bug(float x, float y) {
+    printf("x=%f\ny=%f\n", x, y);
+}
+
+float dot(struct vec v) {
+    return 999.5;
+}
+
+void main(void) {
+        struct vec a;
+        a.x = 33.0f;
+        a.y = 77.0f;
+        bug(dot(a), dot(a));
+}
+

tests/tests2/137_funcall_struct_args.expect

@@ -0,0 +1,2 @@
+x=999.500000
+y=999.500000