* config/i386/i386.c (ix86_compute_frame_layout): Do add bottom
alignment for alloca.
* gcc.c-torture/execute/alloca-1.c: New.
From-SVN: r54018
+2002-05-29 Richard Henderson <rth@redhat.com>
+
+ * config/i386/i386.c (ix86_compute_frame_layout): Do add bottom
+ alignment for alloca.
+
2002-05-29 Richard Henderson <rth@redhat.com>
* config/i386/i386.c (output_pic_addr_const): Lowercase rip.
else
frame->outgoing_arguments_size = 0;
- /* Align stack boundary. Only needed if we're calling another function. */
- if (!current_function_is_leaf)
+ /* Align stack boundary. Only needed if we're calling another function
+ or using alloca. */
+ if (!current_function_is_leaf || current_function_calls_alloca)
frame->padding2 = ((offset + preferred_alignment - 1)
& -preferred_alignment) - offset;
else
--- /dev/null
+/* Verify that alloca storage is sufficiently aligned. */
+/* ??? May fail if BIGGEST_ALIGNMENT > STACK_BOUNDARY. Which, I guess
+ can only happen on !STRICT_ALIGNMENT targets. */
+
+typedef __SIZE_TYPE__ size_t;
+
+struct dummy { int x __attribute__((aligned)); };
+#define BIGGEST_ALIGNMENT __alignof__(struct dummy)
+
+_Bool foo(void)
+{
+ char *p = __builtin_alloca(32);
+ return ((size_t)p & (BIGGEST_ALIGNMENT - 1)) == 0;
+}
+
+int main()
+{
+ if (!foo())
+ abort ();
+ return 0;
+}