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[Bug tree-optimization/20543] New: [4.1 Regression] Bootstrap failure at -Os
- From: "rearnsha at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 18 Mar 2005 21:22:48 -0000
- Subject: [Bug tree-optimization/20543] New: [4.1 Regression] Bootstrap failure at -Os
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
Bootstrapping with BOOT_CFLAGS="-Os -g" fails when the stage2 cc1 is used to
build crtstuff.o. The segmentation fault occurs in find_uses_to_rename_use but
the error really seems to be in its caller find_uses_to_rename_bb
(tree-ssa-loop-manip.c). Looking at the tree dumps we have in t49.loopinit
<L8>:;
stmt_35 = bsi_stmt (bsi);
get_stmt_operands (stmt_35);
var_38 = op_iter_init_tree (&iter, stmt_35, 13);
goto <bb 9> (<L10>);
<L9>:;
var_45 = op_iter_next_tree (&iter);
<L10>:;
D.17355_41 = iter.done;
D.17353_42 = (int) D.17355_41;
D.17347_44 = (unsigned char) D.17353_42;
if (D.17347_44 == 0) goto <L9>; else goto <L12>;
but in t50.lim we have:
<L8>:;
stmt_35 = bsi_stmt (bsi);
get_stmt_operands (stmt_35);
var_38 = op_iter_init_tree (&iter, stmt_35, 13);
lsm_tmp.500_356 = iter.done;
goto <bb 9> (<L10>);
<L9>:;
var_45 = op_iter_next_tree (&iter);
<L10>:;
D.17355_41 = lsm_tmp.500_356;
D.17353_42 = (int) D.17355_41;
D.17347_44 = (unsigned char) D.17353_42;
if (D.17347_44 == 0) goto <L9>; else goto <L18>;
<L18>:;
iter.done = lsm_tmp.500_356;
note that the use of iter.done has been hoisted out of the loop even though the
call of op_iter_next_tree passes the address of iter.
--
Summary: [4.1 Regression] Bootstrap failure at -Os
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rearnsha at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC host triplet: i386-unknown-netbsdelf arm-unknown-netbsdelf
GCC target triplet: i386-unknown-netbsdelf arm-unknown-netbsdelf
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20543