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re PR tree-optimization/20612 (ICE in verify_ssa for -ftree-loop-linear) 

2005-04-11  Daniel Berlin  <dberlin@dberlin.org>

	Fix PR tree-optimization/20612
	* lambda-code.c (lambda_loopnest_to_gcc_loopnest): Fix increment
	handling
	(perfect_nestify): preheaderbb is *not* part of loop of the
	old destination.

From-SVN: r97979
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Daniel Berlin 2005-04-11 18:55:47 +00:00 committed by Daniel Berlin
parent d3010d7286
commit e5e656a499
2 changed files with 23 additions and 2 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2005-04-11 Daniel Berlin <dberlin@dberlin.org>
Fix PR tree-optimization/20612
* lambda-code.c (lambda_loopnest_to_gcc_loopnest): Fix increment
handling
(perfect_nestify): preheaderbb is *not* part of loop of the
old destination.
2005-04-11 Andrew Pinski <pinskia@physics.uc.edu>
* tree-ssa-alias.c (may_alias_p): If the variable

17
gcc/lambda-code.c
View File

@ -1874,6 +1874,7 @@ lambda_loopnest_to_gcc_loopnest (struct loop *old_loopnest,
lambda_linear_expression offset;
tree type;
bool insert_after;
tree inc_stmt;
oldiv = VEC_index (tree, old_ivs, i);
type = TREE_TYPE (oldiv);
@ -1922,7 +1923,20 @@ lambda_loopnest_to_gcc_loopnest (struct loop *old_loopnest,
create_iv (newlowerbound,
build_int_cst (type, LL_STEP (newloop)),
ivvar, temp, &bsi, insert_after, &ivvar,
&ivvarinced);
NULL);
/* Unfortunately, the incremented ivvar that create_iv inserted may not
dominate the block containing the exit condition.
So we simply create our own incremented iv to use in the new exit
test, and let redundancy elimination sort it out. */
inc_stmt = build (PLUS_EXPR, type,
ivvar, build_int_cst (type, LL_STEP (newloop)));
inc_stmt = build (MODIFY_EXPR, void_type_node, SSA_NAME_VAR (ivvar),
inc_stmt);
ivvarinced = make_ssa_name (SSA_NAME_VAR (ivvar), inc_stmt);
TREE_OPERAND (inc_stmt, 0) = ivvarinced;
bsi = bsi_for_stmt (exitcond);
bsi_insert_before (&bsi, inc_stmt, BSI_SAME_STMT);
/* Replace the exit condition with the new upper bound
comparison. */
@ -2375,7 +2389,6 @@ perfect_nestify (struct loops *loops,
add_bb_to_loop (latchbb, newloop);
add_bb_to_loop (bodybb, newloop);
add_bb_to_loop (headerbb, newloop);
add_bb_to_loop (preheaderbb, olddest->loop_father);
set_immediate_dominator (CDI_DOMINATORS, bodybb, headerbb);
set_immediate_dominator (CDI_DOMINATORS, headerbb, preheaderbb);
set_immediate_dominator (CDI_DOMINATORS, preheaderbb,