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tree-optimization/99863 - clear vector CTOR TREE_SIDE_EFFECTS

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When we gimplify a vector CTOR the original CONSTRUCTOR tree remains
but we fail to recompute flags such as TREE_SIDE_EFFECTS.  This causes
later GENERIC folding of them in vector lowering to give up since
the match.pd machinery is careful about TREE_SIDE_EFFECTS.

Fixing this makes vector lowering produce much less garbage and
thus following the IL for PR99793 easier.

2021-04-01  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/99863
	* gimplify.c (gimplify_init_constructor): Recompute vector
	constructor flags.
This commit is contained in:
Richard Biener 2021-04-01 11:51:33 +02:00
parent 3064fc21aa
commit 512429a885
1 changed files with 1 additions and 0 deletions
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gcc/gimplify.c
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@ -5231,6 +5231,7 @@ gimplify_init_constructor (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p,
TREE_TYPE (ce->value)))
TREE_STATIC (ctor) = 0;
}
recompute_constructor_flags (ctor);
if (!is_gimple_reg (TREE_OPERAND (*expr_p, 0)))
TREE_OPERAND (*expr_p, 1) = get_formal_tmp_var (ctor, pre_p);
}