* g++.dg/warn/miss-format-1.C: XFAIL vscanf test on Solaris 2.5.1 to 8.

[pf3gnuchains/gcc-fork.git] / gcc / regrename.c

diff --git a/gcc/regrename.c b/gcc/regrename.c
index 0cfe552..cd448c4 100644 (file)
--- a/gcc/regrename.c
+++ b/gcc/regrename.c
@@ -36,6 +36,8 @@
 #include "flags.h"
 #include "toplev.h"
 #include "obstack.h"
+#include "timevar.h"
+#include "tree-pass.h"
 
 struct du_chain
 {
@@ -1225,6 +1227,12 @@ copy_value (rtx dest, rtx src, struct value_data *vd)
   if (frame_pointer_needed && dr == HARD_FRAME_POINTER_REGNUM)
     return;
 
+  /* Do not propagate copies to fixed or global registers, patterns
+     can be relying to see particular fixed register or users can
+     expect the chosen global register in asm.  */
+  if (fixed_regs[dr] || global_regs[dr])
+    return;
+
   /* If SRC and DEST overlap, don't record anything.  */
   dn = hard_regno_nregs[dr][GET_MODE (dest)];
   sn = hard_regno_nregs[sr][GET_MODE (dest)];
@@ -1901,3 +1909,38 @@ validate_value_data (struct value_data *vd)
                      vd->e[i].next_regno);
 }
 #endif
+\f
+static bool
+gate_handle_regrename (void)
+{
+  return (optimize > 0 && (flag_rename_registers || flag_cprop_registers));
+}
+
+
+/* Run the regrename and cprop passes.  */
+static void
+rest_of_handle_regrename (void)
+{
+  if (flag_rename_registers)
+    regrename_optimize ();
+  if (flag_cprop_registers)
+    copyprop_hardreg_forward ();
+}
+
+struct tree_opt_pass pass_regrename =
+{
+  "rnreg",                              /* name */
+  gate_handle_regrename,                /* gate */
+  rest_of_handle_regrename,             /* execute */
+  NULL,                                 /* sub */
+  NULL,                                 /* next */
+  0,                                    /* static_pass_number */
+  TV_RENAME_REGISTERS,                  /* tv_id */
+  0,                                    /* properties_required */
+  0,                                    /* properties_provided */
+  0,                                    /* properties_destroyed */
+  0,                                    /* todo_flags_start */
+  TODO_dump_func,                       /* todo_flags_finish */
+  'n'                                   /* letter */
+};
+