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tree-optimization/100414 - compute dominance info in phiopt

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phiopt now has dominator queries but fails to compute dominance
info.

2021-05-04  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/100414
	* tree-ssa-phiopt.c (get_non_trapping): Do not compute dominance
	info here.
	(tree_ssa_phiopt_worker): But unconditionally here.

	* gcc.dg/pr100414.c: New testcase.
This commit is contained in:
Richard Biener 2021-05-04 13:39:14 +02:00
parent 1580fc7644
commit 7a38976611
2 changed files with 11 additions and 3 deletions
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9
gcc/testsuite/gcc.dg/pr100414.c Normal file
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@ -0,0 +1,9 @@
/* { dg-do compile } */
/* { dg-options "-O -fno-tree-dce -fno-tree-dse -fchecking" } */
int i;
void
foo (void)
{
i &= i && __builtin_bswap16 (i);
}

5
gcc/tree-ssa-phiopt.c
View file

@ -174,6 +174,8 @@ tree_ssa_phiopt_worker (bool do_store_elim, bool do_hoist_loads, bool early_p)
bool cfgchanged = false;
hash_set<tree> *nontrap = 0;
calculate_dominance_info (CDI_DOMINATORS);
if (do_store_elim)
/* Calculate the set of non-trapping memory accesses. */
nontrap = get_non_trapping ();
@ -2438,9 +2440,6 @@ get_non_trapping (void)
{
nt_call_phase = 0;
hash_set<tree> *nontrap = new hash_set<tree>;
/* We're going to do a dominator walk, so ensure that we have
dominance information. */
calculate_dominance_info (CDI_DOMINATORS);
nontrapping_dom_walker (CDI_DOMINATORS, nontrap)
.walk (cfun->cfg->x_entry_block_ptr);