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Given recent changes to the dot_prod standard pattern name, this patch fixes the aarch64 back-end by implementing the following changes: 1. Add 2nd mode to all (u|s|us)dot_prod patterns in .md files. 2. Rewrite initialization and function expansion mechanism for simd builtins. 3. Fix all direct calls to back-end `dot_prod' patterns in SVE builtins. Finally, given that it is now possible for the compiler to differentiate between the two- and four-way dot product, we add a test to ensure that autovectorization picks up on dot-product patterns where the result is twice the width of the operands. gcc/ChangeLog: * config/aarch64/aarch64-simd.md (<sur>dot_prod<vsi2qi><vczle><vczbe>): Renamed to... (<sur>dot_prod<mode><vsi2qi><vczle><vczbe>): ...this. (usdot_prod<vsi2qi><vczle><vczbe>): Renamed to... (usdot_prod<mode><vsi2qi><vczle><vczbe>): ...this. (<su>sadv16qi): Adjust call to gen_udot_prod take second mode. (popcount<mode2>): fix use of `udot_prod_optab'. * config/aarch64/aarch64-sve.md (<sur>dot_prod<vsi2qi>): Renamed to... (<sur>dot_prod<mode><vsi2qi>): ...this. (@<sur>dot_prod<vsi2qi>): Renamed to... (@<sur>dot_prod<mode><vsi2qi>): ...this. (<su>sad<vsi2qi>): Adjust call to gen_udot_prod take second mode. * config/aarch64/aarch64-sve2.md (@aarch64_sve_<sur>dotvnx4sivnx8hi): Renamed to... (<sur>dot_prodvnx4sivnx8hi): ...this. * config/aarch64/aarch64-simd-builtins.def: Modify macro expansion-based initialization and expansion of (u|s|us)dot_prod builtins. * config/aarch64/aarch64-builtins.cc (CODE_FOR_aarch64_sdot_prodv8qi): Define as alias to new CODE_FOR_sdot_prodv2siv8qi. (CODE_FOR_aarch64_udot_prodv8qi): Define as alias to new CODE_FOR_udot_prodv2siv8qi. (CODE_FOR_aarch64_usdot_prodv8qi): Define as alias to new CODE_FOR_usdot_prodv2siv8qi. (CODE_FOR_aarch64_sdot_prodv16qi): Define as alias to new CODE_FOR_sdot_prodv4siv16qi. (CODE_FOR_aarch64_udot_prodv16qi): Define as alias to new CODE_FOR_udot_prodv4siv16qi. (CODE_FOR_aarch64_usdot_prodv16qi): Define as alias to new CODE_FOR_usdot_prodv4siv16qi. * config/aarch64/aarch64-sve-builtins-base.cc (svdot_impl::expand): s/direct/convert/ in `convert_optab_handler_for_sign' function call. (svusdot_impl::expand): add second mode argument in call to `code_for_dot_prod'. * config/aarch64/aarch64-sve-builtins.cc (function_expander::convert_optab_handler_for_sign): New class method. * config/aarch64/aarch64-sve-builtins.h (class function_expander): Add prototype for new `convert_optab_handler_for_sign' method. gcc/testsuite/ChangeLog: * gcc.target/aarch64/sme/vect-dotprod-twoway.c (udot2): New.
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