[Bug rtl-optimization/27616] [4.1/4.2 Regression] Infinite loop at -O1 and above in RTL CSE

["ebotcazou at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #15 from ebotcazou at gcc dot gnu dot org  2006-09-04 19:35 -------
Subject: Bug 27616

Author: ebotcazou
Date: Mon Sep  4 19:35:09 2006
New Revision: 116684

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=116684
Log:
        PR rtl-optimization/27616
        * cse.c (table_size): New static variable.
        (new_basic_block): Initialize it to 0.
        (remove_from_table): Decrement it.
        (insert): Increment it.
        (fold_rtx_mem_1): New function, renamed from fold_rtx_mem.
        (fold_rtx_mem): Enforce a cap on the recursion depth.  Call
        fold_rtx_mem_1 if under the cap.
        (fold_rtx) <RTX_COMM_ARITH>: In the associative case, delay a little
        the lookup of the equivalent expression and test for equality of the
        first operand of the equivalent expression before in turn looking up
        an equivalent constant for the second operand.


Added:
    branches/gcc-4_1-branch/gcc/testsuite/gcc.c-torture/compile/20060904-1.c
Modified:
    branches/gcc-4_1-branch/gcc/ChangeLog
    branches/gcc-4_1-branch/gcc/cse.c
    branches/gcc-4_1-branch/gcc/testsuite/ChangeLog


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27616