re PR c/83844 (ICE with warn_if_not_aligned attribute)

	PR c/83844
	* stor-layout.c (handle_warn_if_not_align): Use byte_position and
	multiple_of_p instead of unchecked tree_to_uhwi and UHWI check.
	If off is not INTEGER_CST, issue a may not be aligned warning
	rather than isn't aligned.  Use isn%'t rather than isn't.
	* fold-const.c (multiple_of_p) <case BIT_AND_EXPR>: Don't fall through
	into MULT_EXPR.
	<case MULT_EXPR>: Improve the case when bottom and one of the
	MULT_EXPR operands are INTEGER_CSTs and bottom is multiple of that
	operand, in that case check if the other operand is multiple of
	bottom divided by the INTEGER_CST operand.

	* gcc.dg/pr83844.c: New test.

From-SVN: r256745

1 files changed, 36 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/pr83844.c b/gcc/testsuite/gcc.dg/pr83844.c
new file mode 100644
index 0000000..c6db68a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr83844.c
@@ -0,0 +1,36 @@
+/* PR c/83844 */
+/* { dg-do compile } */
+/* { dg-options "-O0 -Wall" } */
+
+typedef unsigned long long __u64 __attribute__((aligned(4),warn_if_not_aligned(8)));
+void bar (void *, void *, void *);
+
+void
+foo (int n)
+{
+  struct A
+  {
+    int i1;
+    int i2;
+    int i3[n];
+    __u64 x;	/* { dg-warning "in 'struct A' may not be aligned to 8" } */
+  } __attribute__((aligned (8)));
+  struct B
+  {
+    int i1;
+    int i2;
+    long long i3[n];
+    __u64 x;
+  } __attribute__((aligned (8)));
+  struct C
+  {
+    int i1;
+    int i2;
+    int i3[2 * n];
+    __u64 x;
+  } __attribute__((aligned (8)));
+  struct A a;
+  struct B b;
+  struct C c;
+  bar (&a, &b, &c);
+}