Gcc 3.2.1-prerelease from the FSF anoncvs repo gcc-3_2-branch on 1-Sep-2002 00:00:01 EDT.

1 files changed, 4 insertions, 2 deletions

diff --git a/contrib/gcc/unroll.c b/contrib/gcc/unroll.c
index 6936a71..6be951e 100644
--- a/contrib/gcc/unroll.c
+++ b/contrib/gcc/unroll.c
@@ -3305,7 +3305,8 @@ final_giv_value (loop, v)
 
   /* Try to calculate the final value as a function of the biv it depends
      upon.  The only exit from the loop must be the fall through at the bottom
-     (otherwise it may not have its final value when the loop exits).  */
+     and the insn that sets the giv must be executed on every iteration
+     (otherwise the giv may not have its final value when the loop exits).  */
 
   /* ??? Can calculate the final giv value by subtracting off the
      extra biv increments times the giv's mult_val.  The loop must have
@@ -3313,7 +3314,8 @@ final_giv_value (loop, v)
      to be known.  */
 
   if (n_iterations != 0
-      && ! loop->exit_count)
+      && ! loop->exit_count
+      && v->always_executed)
     {
       /* ?? It is tempting to use the biv's value here since these insns will
 	 be put after the loop, and hence the biv will have its final value