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middle-end: Fix phi-ssa assertion triggers. [PR106519] 

For the diamond PHI form in tree_ssa_phiopt_worker we need to
extract edge e2 sooner.  This changes it so we extract it at the
same time we determine we have a diamond shape.

gcc/ChangeLog:

	PR middle-end/106519
	* tree-ssa-phiopt.cc (tree_ssa_phiopt_worker): Check final phi edge for
	diamond shapes.

gcc/testsuite/ChangeLog:

	PR middle-end/106519
	* gcc.dg/pr106519.c: New test.
This commit is contained in:
Tamar Christina 2022-08-04 16:35:31 +01:00
parent 39579ba8de
commit c832ec4c3e
2 changed files with 15 additions and 2 deletions
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11
gcc/testsuite/gcc.dg/pr106519.c Normal file
View File

@ -0,0 +1,11 @@
/* { dg-do compile } */
int bytestart, bytemem_0_0, modlookup_l_p;
void
modlookup_l() {
long j;
while (modlookup_l_p)
while (bytestart && j && bytemem_0_0)
j = j + 1;
}

6
gcc/tree-ssa-phiopt.cc
View File

@ -269,7 +269,10 @@ tree_ssa_phiopt_worker (bool do_store_elim, bool do_hoist_loads, bool early_p)
}
else if (EDGE_SUCC (bb1, 0)->dest == EDGE_SUCC (bb2, 0)->dest
&& !empty_block_p (bb1))
diamond_p = true;
{
diamond_p = true;
e2 = EDGE_SUCC (bb2, 0);
}
else
continue;
@ -324,7 +327,6 @@ tree_ssa_phiopt_worker (bool do_store_elim, bool do_hoist_loads, bool early_p)
if (!candorest)
continue;
e2 = diamond_p ? EDGE_SUCC (bb2, 0) : e2;
phi = single_non_singleton_phi_for_edges (phis, e1, e2);
if (!phi)
continue;