[GCC][PATCH][ARM]Add ACLE intrinsics for dot product (vusdot - vector, v<us/su>dot - by element) for AArch32 AdvSIMD ARMv8.6 Extension This patch adds the ARMv8.6 Extension ACLE intrinsics for dot product operations (vector/by element) to the ARM back-end. These are: usdot (vector), <us/su>dot (by element). The functions are optional from ARMv8.2-a as -march=armv8.2-a+i8mm and for ARM they remain optional after as of ARMv8.6-a. The functions are declared in arm_neon.h, RTL patterns are defined to generate assembler and tests are added to verify and perform adequate checks. Regression testing on arm-none-eabi passed successfully. gcc/ChangeLog: 2020-02-11 Stam Markianos-Wright <stam.markianos-wright@arm.com> * config/arm/arm-builtins.c (enum arm_type_qualifiers): (USTERNOP_QUALIFIERS): New define. (USMAC_LANE_QUADTUP_QUALIFIERS): New define. (SUMAC_LANE_QUADTUP_QUALIFIERS): New define. (arm_expand_builtin_args): Add case ARG_BUILTIN_LANE_QUADTUP_INDEX. (arm_expand_builtin_1): Add qualifier_lane_quadtup_index. * config/arm/arm_neon.h (vusdot_s32): New. (vusdot_lane_s32): New. (vusdotq_lane_s32): New. (vsudot_lane_s32): New. (vsudotq_lane_s32): New. * config/arm/arm_neon_builtins.def (usdot, usdot_lane,sudot_lane): New. * config/arm/iterators.md (DOTPROD_I8MM): New. (sup, opsuffix): Add <us/su>. * config/arm/neon.md (neon_usdot, <us/su>dot_lane: New. * config/arm/unspecs.md (UNSPEC_DOT_US, UNSPEC_DOT_SU): New. gcc/testsuite/ChangeLog: 2020-02-11 Stam Markianos-Wright <stam.markianos-wright@arm.com> * gcc.target/arm/simd/vdot-2-1.c: New test. * gcc.target/arm/simd/vdot-2-2.c: New test. * gcc.target/arm/simd/vdot-2-3.c: New test. * gcc.target/arm/simd/vdot-2-4.c: New test.
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