From: spop <spop@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Thu, 11 Nov 2004 19:25:58 +0000 (+0000)
Subject: 	* tree-scalar-evolution.c (follow_ssa_edge_in_condition_phi):
X-Git-Url: http://git.sourceforge.jp/view?p=pf3gnuchains%2Fgcc-fork.git;a=commitdiff_plain;h=c44857915cabf9415facd521236faf982c9c0786;hp=8495accb79374dfe513abfef0d3e79b117fb611d

	* tree-scalar-evolution.c (follow_ssa_edge_in_condition_phi):
	Give up as soon as the evolution is known not computable.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@90491 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 21599f4ac20..620cefa952f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2004-11-11  Sebastian Pop  <pop@cri.ensmp.fr>
+
+	* tree-scalar-evolution.c (follow_ssa_edge_in_condition_phi): 
+	Give up as soon as the evolution is known not computable.
+
 2004-11-11  Nathan Sidwell  <nathan@codesourcery.com>
 
 	PR target/16457
diff --git a/gcc/tree-scalar-evolution.c b/gcc/tree-scalar-evolution.c
index 7d97d92dce2..e26f1da48db 100644
--- a/gcc/tree-scalar-evolution.c
+++ b/gcc/tree-scalar-evolution.c
@@ -1398,6 +1398,11 @@ follow_ssa_edge_in_condition_phi (struct loop *loop,
 
   for (i = 1; i < PHI_NUM_ARGS (condition_phi); i++)
     {
+      /* Quickly give up when the evolution of one of the branches is
+	 not known.  */
+      if (*evolution_of_loop == chrec_dont_know)
+	return true;
+
       if (!follow_ssa_edge_in_condition_phi_branch (i, loop, condition_phi,
 						    halting_phi,
 						    &evolution_of_branch,