PATCH: PR target/59363: [4.9 Regression] r203886 miscompiles git

[H.J. Lu]

Hi,

emit_memset fails to adjust destination address after gen_strset, which
leads to the wrong address in aliasing info.  This patch fixes it.
Tested on Linux/x86-64.  OK to install?

Thanks.

H.J.
---
gcc/

2013-12-03   H.J. Lu  <hongjiu...@intel.com>

        PR target/59363
        * config/i386/i386.c (emit_memset): Adjust destination address
        after gen_strset.

gcc/testsuite/

2013-12-03   H.J. Lu  <hongjiu...@intel.com>

        PR target/59363
        * gcc.target/i386/pr59363.c: New file.

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index aa221df..d395a99 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -22806,6 +22806,8 @@ emit_memset (rtx destmem, rtx destptr, rtx promoted_val,
       if (piece_size <= GET_MODE_SIZE (word_mode))
        {
          emit_insn (gen_strset (destptr, dst, promoted_val));
+         dst = adjust_automodify_address_nv (dst, move_mode, destptr,
+                                             piece_size);
          continue;
        }
 
diff --git a/gcc/testsuite/gcc.target/i386/pr59363.c 
b/gcc/testsuite/gcc.target/i386/pr59363.c
new file mode 100644
index 0000000..a4e1240
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr59363.c
@@ -0,0 +1,24 @@
+/* PR target/59363 */
+/* { dg-do run } */
+/* { dg-options "-O2 -mtune=amdfam10" } */
+
+typedef struct {
+  int ctxlen;
+  long interhunkctxlen;
+  int flags;
+  long find_func;
+  void *find_func_priv;
+  int hunk_func;
+} xdemitconf_t;
+
+__attribute__((noinline))
+int xdi_diff(xdemitconf_t *xecfg) {
+  if (xecfg->hunk_func == 0)
+    __builtin_abort();
+  return 0;
+}
+int main() {
+  xdemitconf_t xecfg = {0};
+  xecfg.hunk_func = 1;
+  return xdi_diff(&xecfg);
+}