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authorliuhongt <hongtao.liu@intel.com>2024-07-12 09:39:23 +0800
committerliuhongt <hongtao.liu@intel.com>2024-07-15 15:19:50 +0800
commitf27bf48e0204524ead795fe618cd8b1224f72fd4 (patch)
tree3dcaf7e67ea4e76403aa7ce179b049821e9c574a /gcc/tree-vect-loop.cc
parent681ff5ccca153864eb86099eed201838d8d98bc2 (diff)
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Fix SSA_NAME leak due to def_stmt is removed before use_stmt.
- _5 = __atomic_fetch_or_8 (&set_work_pending_p, 1, 0); - # DEBUG old => (long int) _5 + _6 = .ATOMIC_BIT_TEST_AND_SET (&set_work_pending_p, 0, 1, 0, __atomic_fetch_or_8); + # DEBUG old => NULL # DEBUG BEGIN_STMT - # DEBUG D#2 => _5 & 1 + # DEBUG D#2 => NULL ... - _10 = ~_5; - _8 = (_Bool) _10; - # DEBUG ret => _8 + _8 = _6 == 0; + # DEBUG ret => (_Bool) _10 confirmed. convert_atomic_bit_not does this, it checks for single_use and removes the def, failing to release the name (which would fix this up IIRC). Note the function removes stmts in "wrong" order (before uses of LHS are removed), so it requires larger surgery. And it leaks SSA names. gcc/ChangeLog: PR target/115872 * tree-ssa-ccp.cc (convert_atomic_bit_not): Remove use_stmt after use_nop_stmt is removed. (optimize_atomic_bit_test_and): Ditto. gcc/testsuite/ChangeLog: * gcc.target/i386/pr115872.c: New test.
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