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re PR tree-optimization/90273 (GCC runs out of memory building Firefox)

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2019-05-02  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/90273
	* tree-ssa-dce.c (eliminate_unnecessary_stmts): Eliminate
	useless debug stmts.

From-SVN: r270791
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Richard Biener 2019-05-02 11:17:00 +00:00 committed by Richard Biener
parent 9feeafd7f9
commit c27998546a
2 changed files with 24 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2019-05-02 Richard Biener <rguenther@suse.de>
PR tree-optimization/90273
* tree-ssa-dce.c (eliminate_unnecessary_stmts): Eliminate
useless debug stmts.
2019-05-02 Alejandro Martinez <alejandro.martinezvicente@arm.com>
* config/aarch64/aarch64-sve.md (<sur>dot_prod<vsi2qi>): Taken from SVE

19
gcc/tree-ssa-dce.c
View File

@ -1237,6 +1237,7 @@ eliminate_unnecessary_stmts (void)
bb = h.pop ();
/* Remove dead statements. */
auto_bitmap debug_seen;
for (gsi = gsi_last_bb (bb); !gsi_end_p (gsi); gsi = psi)
{
stmt = gsi_stmt (gsi);
@ -1282,11 +1283,15 @@ eliminate_unnecessary_stmts (void)
}
}
if (!dead)
continue;
{
bitmap_clear (debug_seen);
continue;
}
}
if (!is_gimple_debug (stmt))
something_changed = true;
remove_dead_stmt (&gsi, bb, to_remove_edges);
continue;
}
else if (is_gimple_call (stmt))
{
@ -1352,6 +1357,18 @@ eliminate_unnecessary_stmts (void)
break;
}
}
else if (gimple_debug_bind_p (stmt))
{
/* We are only keeping the last debug-bind of a
non-DEBUG_EXPR_DECL variable in a series of
debug-bind stmts. */
tree var = gimple_debug_bind_get_var (stmt);
if (TREE_CODE (var) != DEBUG_EXPR_DECL
&& !bitmap_set_bit (debug_seen, DECL_UID (var)))
remove_dead_stmt (&gsi, bb, to_remove_edges);
continue;
}
bitmap_clear (debug_seen);
}
/* Remove dead PHI nodes. */