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For testcase in PR, the patch supports QI:4 -> HI:16 pack with multi steps(first pack QI:4 -> QI:8 through vec_pack_sbool_trunc_qi, then pack QI:8 -> HI:16 through vec_pack_trunc_hi). Similar for QI:2 -> HI:16 which is test4 in mask-pack-prefer-128.c. gcc/ChangeLog: PR target/103771 * tree-vect-stmts.cc (supportable_narrowing_operation): Enhance integral mode mask pack by multi steps which takes vec_pack_sbool_trunc_optab as start when elements number is less than BITS_PER_UNITS. gcc/testsuite/ChangeLog: * gcc.target/i386/mask-pack-prefer128.c: New test. * gcc.target/i386/mask-pack-prefer256.c: New test. * gcc.target/i386/pr103771.c: New test. |
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