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tree-ssa-threadedge.c (record_temporary_equivalences_from_stmts_at_dest): Do not allow __builtin_constant_p.

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This is the same as commit 70a6200918 ("tree-ssa-threadbackward.c
(profitable_jump_thread_path): Do not allow __builtin_constant_p."), but
for the old forward threader.

gcc/ChangeLog:

2020-12-03  Ilya Leoshkevich  <iii@linux.ibm.com>

	* tree-ssa-threadedge.c (record_temporary_equivalences_from_stmts_at_dest):
	Do not allow __builtin_constant_p on a threading path.
This commit is contained in:
Ilya Leoshkevich 2020-12-03 01:38:47 +01:00
parent 73564433f5
commit 614aff0adf
1 changed files with 6 additions and 0 deletions
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6
gcc/tree-ssa-threadedge.c
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@ -265,6 +265,12 @@ record_temporary_equivalences_from_stmts_at_dest (edge e,
&& gimple_call_internal_unique_p (stmt))
return NULL;
/* We cannot thread through __builtin_constant_p, because an
expression that is constant on two threading paths may become
non-constant (i.e.: phi) when they merge. */
if (gimple_call_builtin_p (stmt, BUILT_IN_CONSTANT_P))
return NULL;
/* If duplicating this block is going to cause too much code
expansion, then do not thread through this block. */
stmt_count++;