@@ -2377,6 +2377,18 @@ expand_call (tree exp, rtx target, int ignore)
preferred_unit_stack_boundary = preferred_stack_boundary / BITS_PER_UNIT;
+ if (SUPPORTS_STACK_ALIGNMENT)
+ {
+ /* All variable sized adjustments must be multiple of preferred
+ stack boundary. Stack alignment may change preferred stack
+ boundary after variable sized adjustments have been made. We
+ need to compensate it here. */
+ unsigned HOST_WIDE_INT delta
+ = (stack_pointer_delta % preferred_unit_stack_boundary);
+ if (delta)
+ anti_adjust_stack (GEN_INT (preferred_unit_stack_boundary - delta));
+ }
+
/* We want to make two insn chains; one for a sibling call, the other
for a normal call. We will select one of the two chains after
initial RTL generation is complete. */
@@ -0,0 +1,32 @@
+/* PR middle-end/45234 */
+/* { dg-do run { target { { i?86-*-* x86_64-*-* } && ilp32 } } } */
+/* { dg-options "-m32 -mincoming-stack-boundary=2 -mpreferred-stack-boundary=2" } */
+
+#include "check.h"
+
+void
+__attribute__ ((noinline))
+bar (__float128 f)
+{
+ check (&f, __alignof__(f));
+}
+
+int
+main (void)
+{
+ char *p = __builtin_alloca (6);
+
+ bar (0);
+
+ __builtin_strncpy (p, "good", 5);
+ if (__builtin_strncmp (p, "good", 5) != 0)
+ {
+#ifdef DEBUG
+ p[size] = '\0';
+ printf ("Failed: %s != good\n", p);
+#endif
+ abort ();
+ }
+
+ return 0;
+}