Fix v850 PlumHall testsuite failure.

	* alias.c (record_set): Handle multi-reg hard registers.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@60474 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 388076d..e23c31a 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2002-12-24  Jim Wilson  <wilson@redhat.com>
+
+       * alias.c (record_set): Handle multi-reg hard registers.
+
 2002-12-24  Kazu Hirata  <kazu@cs.umass.edu>
 
        * regmove.c: Fix comment typos.

diff --git a/gcc/alias.c b/gcc/alias.c
index 12029f0..fee64b1 100644 (file)
--- a/gcc/alias.c
+++ b/gcc/alias.c
@@ -932,6 +932,7 @@ record_set (dest, set, data)
 {
   unsigned regno;
   rtx src;
+  int n;
 
   if (GET_CODE (dest) != REG)
     return;
@@ -941,6 +942,22 @@ record_set (dest, set, data)
   if (regno >= reg_base_value_size)
     abort ();
 
+  /* If this spans multiple hard registers, then we must indicate that every
+     register has an unusable value.  */
+  if (regno < FIRST_PSEUDO_REGISTER)
+    n = HARD_REGNO_NREGS (regno, GET_MODE (dest));
+  else
+    n = 1;
+  if (n != 1)
+    {
+      while (--n >= 0)
+       {
+         reg_seen[regno + n] = 1;
+         new_reg_base_value[regno + n] = 0;
+       }
+      return;
+    }
+
   if (set)
     {
       /* A CLOBBER wipes out any old value but does not prevent a previously