https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100757
--- Comment #16 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Christophe Lyon <cl...@gcc.gnu.org>: https://gcc.gnu.org/g:884f77b4222289510e1df9db2889b60c5df6fcda commit r12-7338-g884f77b4222289510e1df9db2889b60c5df6fcda Author: Christophe Lyon <christophe.l...@arm.com> Date: Wed Oct 13 09:16:22 2021 +0000 arm: Implement MVE predicates as vectors of booleans This patch implements support for vectors of booleans to support MVE predicates, instead of HImode. Since the ABI mandates pred16_t (aka uint16_t) to represent predicates in intrinsics prototypes, we introduce a new "predicate" type qualifier so that we can map relevant builtins HImode arguments and return value to the appropriate vector of booleans (VxBI). We have to update test_vector_ops_duplicate, because it iterates using an offset in bytes, where we would need to iterate in bits: we stop iterating when we reach the end of the vector of booleans. In addition, we have to fix the underlying definition of vectors of booleans because ARM/MVE needs a different representation than AArch64/SVE. With ARM/MVE the 'true' bit is duplicated over the element size, so that a true element of V4BI is represented by '0b1111'. This patch updates the aarch64 definition of VNx*BI as needed. Most of the work of this patch series was carried out while I was working at STMicroelectronics as a Linaro assignee. 2022-02-22 Christophe Lyon <christophe.l...@arm.com> Richard Sandiford <richard.sandif...@arm.com> gcc/ PR target/100757 PR target/101325 * config/aarch64/aarch64-modes.def (VNx16BI, VNx8BI, VNx4BI, VNx2BI): Update definition. * config/arm/arm-builtins.cc (arm_init_simd_builtin_types): Add new simd types. (arm_init_builtin): Map predicate vectors arguments to HImode. (arm_expand_builtin_args): Move HImode predicate arguments to VxBI rtx. Move return value to HImode rtx. * config/arm/arm-builtins.h (arm_type_qualifiers): Add qualifier_predicate. * config/arm/arm-modes.def (B2I, B4I, V16BI, V8BI, V4BI): New modes. * config/arm/arm-simd-builtin-types.def (Pred1x16_t, Pred2x8_t,Pred4x4_t): New. * emit-rtl.cc (init_emit_once): Handle all boolean modes. * genmodes.cc (mode_data): Add boolean field. (blank_mode): Initialize it. (make_complex_modes): Fix handling of boolean modes. (make_vector_modes): Likewise. (VECTOR_BOOL_MODE): Use new COMPONENT parameter. (make_vector_bool_mode): Likewise. (BOOL_MODE): New. (make_bool_mode): New. (emit_insn_modes_h): Fix generation of boolean modes. (emit_class_narrowest_mode): Likewise. * machmode.def: (VECTOR_BOOL_MODE): Document new COMPONENT parameter. Use new BOOL_MODE instead of FRACTIONAL_INT_MODE to define BImode. * rtx-vector-builder.cc (rtx_vector_builder::find_cached_value): Fix handling of constm1_rtx for VECTOR_BOOL. * simplify-rtx.cc (native_encode_rtx): Fix support for VECTOR_BOOL. (native_decode_vector_rtx): Likewise. (test_vector_ops_duplicate): Skip vec_merge test with vectors of booleans. * varasm.cc (output_constant_pool_2): Likewise.
