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vr-values.c (vr_values::extract_range_from_ssa_name): Do not put equivalences on UNDEFINED ranges.

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2019-06-06  Richard Biener  <rguenther@suse.de>

	* vr-values.c (vr_values::extract_range_from_ssa_name): Do not
	put equivalences on UNDEFINED ranges.
	* gimple-ssa-evrp.c (evrp_dom_walker::before_dom_children):
	Make sure to drop defs of stmts added during simplification
	to VARYING.

From-SVN: r271990
This commit is contained in:
Richard Biener 2019-06-06 07:32:44 +00:00 committed by Richard Biener
parent ed315c041f
commit 8ce6fb5fec
3 changed files with 27 additions and 1 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2019-06-06 Richard Biener <rguenther@suse.de>
* vr-values.c (vr_values::extract_range_from_ssa_name): Do not
put equivalences on UNDEFINED ranges.
* gimple-ssa-evrp.c (evrp_dom_walker::before_dom_children):
Make sure to drop defs of stmts added during simplification
to VARYING.
2019-06-06 Richard Biener <rguenther@suse.de>
* tree-ssa-structalias.c: Include tree-cfg.h.

17
gcc/gimple-ssa-evrp.c
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@ -175,6 +175,8 @@ evrp_dom_walker::before_dom_children (basic_block bb)
/* Try folding stmts with the VR discovered. */
bool did_replace = evrp_folder.replace_uses_in (stmt);
gimple_stmt_iterator prev_gsi = gsi;
gsi_prev (&prev_gsi);
if (fold_stmt (&gsi, follow_single_use_edges)
|| did_replace)
{
@ -191,6 +193,21 @@ evrp_dom_walker::before_dom_children (basic_block bb)
if (did_replace)
{
/* If we wound up generating new stmts during folding
drop all their defs to VARYING. We can't easily
process them because we've already instantiated
ranges on uses on STMT that only hold after it. */
if (gsi_end_p (prev_gsi))
prev_gsi = gsi_start_bb (bb);
else
gsi_next (&prev_gsi);
while (gsi_stmt (prev_gsi) != gsi_stmt (gsi))
{
evrp_range_analyzer.get_vr_values ()
->set_defs_to_varying (gsi_stmt (prev_gsi));
gsi_next (&prev_gsi);
}
/* If we cleaned up EH information from the statement,
remove EH edges. */
if (maybe_clean_or_replace_eh_stmt (old_stmt, stmt))

3
gcc/vr-values.c
View File

@ -719,7 +719,8 @@ vr_values::extract_range_from_ssa_name (value_range *vr, tree var)
else
vr->set (var);
vr->equiv_add (var, get_value_range (var), &vrp_equiv_obstack);
if (!vr->undefined_p ())
vr->equiv_add (var, get_value_range (var), &vrp_equiv_obstack);
}
/* Extract range information from a binary expression OP0 CODE OP1 based on