PR middle-end/43690

	* gimplify.c (gimplify_asm_expr): If a "m" input is a
	{pre,post}{in,de}crement, fail.

	* c-c++-common/pr43690.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@166354 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 749951a..9af445b 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -3,6 +3,10 @@
        * cfgexpand.c (expand_debug_expr): Handle MEM_REF
        with non-zero offset.
 
+       PR middle-end/43690
+       * gimplify.c (gimplify_asm_expr): If a "m" input is a
+       {pre,post}{in,de}crement, fail.
+
        PR debug/46307
        * tree-ssa-operands.c (get_expr_operands): Handle FMA_EXPR.
        * tree-pretty-print.c (dump_generic_node): Likewise.

diff --git a/gcc/gimplify.c b/gcc/gimplify.c
index f490349..128ac02 100644 (file)
--- a/gcc/gimplify.c
+++ b/gcc/gimplify.c
@@ -5066,6 +5066,13 @@ gimplify_asm_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
       /* If the operand is a memory input, it should be an lvalue.  */
       if (!allows_reg && allows_mem)
        {
+         tree inputv = TREE_VALUE (link);
+         STRIP_NOPS (inputv);
+         if (TREE_CODE (inputv) == PREDECREMENT_EXPR
+             || TREE_CODE (inputv) == PREINCREMENT_EXPR
+             || TREE_CODE (inputv) == POSTDECREMENT_EXPR
+             || TREE_CODE (inputv) == POSTINCREMENT_EXPR)
+           TREE_VALUE (link) = error_mark_node;
          tret = gimplify_expr (&TREE_VALUE (link), pre_p, post_p,
                                is_gimple_lvalue, fb_lvalue | fb_mayfail);
          mark_addressable (TREE_VALUE (link));

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 2041a7a..8ac52a0 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2010-11-05  Jakub Jelinek  <jakub@redhat.com>
+
+       PR middle-end/43690
+       * c-c++-common/pr43690.c: New test.
+
 2010-11-05  Iain Sandoe  <iains@gcc.gnu.org>
 
        * objc.dg/torture/forward-1.m: Restore for m32 NeXT.

diff --git a/gcc/testsuite/c-c++-common/pr43690.c b/gcc/testsuite/c-c++-common/pr43690.c
new file mode 100644 (file)
index 0000000..67c6cb0
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/pr43690.c
@@ -0,0 +1,13 @@
+/* PR middle-end/43690 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+void
+foo (char *x)
+{
+  asm ("" : : "m" (x++));      /* { dg-error "is not directly addressable" } */
+  asm ("" : : "m" (++x));      /* { dg-error "is not directly addressable" } */
+  asm ("" : : "m" (x--));      /* { dg-error "is not directly addressable" } */
+  asm ("" : : "m" (--x));      /* { dg-error "is not directly addressable" } */
+  asm ("" : : "m" (x + 1));    /* { dg-error "is not directly addressable" } */
+}