* loop.c (strength_reduce): Don't do biv->giv conversion on constants.

From-SVN: r27194

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2ea55b83aa6fb2ba708c5f03a64e092c9bea2b6d..f6c768aa097b44e029a98aaa933ee5fabd732c21 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+Thu May 27 02:40:48 1999  J"orn Rennecke <amylaar@cygnus.co.uk>
+
+       * loop.c (strength_reduce): Don't do biv->giv conversion on constants.
+
 Thu May 27 02:09:27 1999  Jeffrey A Law  (law@cygnus.com)
 
        * reload.c (push_reload): Do not call remove_address_replacements

diff --git a/gcc/loop.c b/gcc/loop.c
index 7ee653218ca2b5b5de9c3194eaf0d982a2b0bbec..c7047f286f01d7abcd3f39f521d3569d85a7d769 100644 (file)
--- a/gcc/loop.c
+++ b/gcc/loop.c
@@ -4193,6 +4193,8 @@ strength_reduce (scan_start, end, loop_top, insn_count,
                  || ! next->always_executed
                  || next->maybe_multiple
                  || ! CONSTANT_P (next->add_val)
+                 || v->mult_val != const1_rtx
+                 || next->mult_val != const1_rtx
                  || ! (biv_dead_after_loop
                        || no_jumps_between_p (v->insn, next->insn)))
                {