https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110202
--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by hongtao Liu <liuho...@gcc.gnu.org>: https://gcc.gnu.org/g:13c556d6ae84be3ee2bc245a56eafa58221de86a commit r14-2447-g13c556d6ae84be3ee2bc245a56eafa58221de86a Author: liuhongt <hongtao....@intel.com> Date: Thu Jun 29 14:25:28 2023 +0800 Break false dependence for vpternlog by inserting vpxor or setting constraint of input operand to '0' False dependency happens when destination is only updated by pternlog. There is no false dependency when destination is also used in source. So either a pxor should be inserted, or input operand should be set with constraint '0'. gcc/ChangeLog: PR target/110438 PR target/110202 * config/i386/predicates.md (int_float_vector_all_ones_operand): New predicate. * config/i386/sse.md (*vmov<mode>_constm1_pternlog_false_dep): New define_insn. (*<avx512>_cvtmask2<ssemodesuffix><mode>_pternlog_false_dep): Ditto. (*<avx512>_cvtmask2<ssemodesuffix><mode>_pternlog_false_dep): Ditto. (*<avx512>_cvtmask2<ssemodesuffix><mode>): Adjust to define_insn_and_split to avoid false dependence. (*<avx512>_cvtmask2<ssemodesuffix><mode>): Ditto. (<mask_codefor>one_cmpl<mode>2<mask_name>): Adjust constraint of operands 1 to '0' to avoid false dependence. (*andnot<mode>3): Ditto. (iornot<mode>3): Ditto. (*<nlogic><mode>3): Ditto. gcc/testsuite/ChangeLog: * gcc.target/i386/pr110438.c: New test. * gcc.target/i386/pr100711-6.c: Adjust testcase.
