As Jakub says in the PR, the fix for PR 46309 indirectly depends on
BRANCH_COST, and the PR is still open because of that. For the time
being, it seems better to avoid the failure for MIPS targets by
tuning for a processor with a high branch cost.
Tested on mips64-linux-gnu and applied.
Richard
gcc/testsuite/
* gcc.dg/pr46309.c: Add -mtune=octeon2 for MIPS.
Index: gcc/testsuite/gcc.dg/pr46309.c
===================================================================
--- gcc/testsuite/gcc.dg/pr46309.c 2011-12-31 11:12:38.000000000 +0000
+++ gcc/testsuite/gcc.dg/pr46309.c 2011-12-31 11:14:19.000000000 +0000
@@ -1,6 +1,9 @@
/* PR tree-optimization/46309 */
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-reassoc-details" } */
+/* The transformation depends on BRANCH_COST being greater than 1
+ (see the notes in the PR), so try to force that. */
+/* { dg-additional-options "-mtune=octeon2" { target mips*-*-* } } */
int
f1 (int a)
