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This patch adds the Armv8.6-a ACLE intrinsics for bfcvtn, bfcvtn2 and bfcvt as part of the BFloat16 extension. (https://developer.arm.com/architectures/instruction-sets/simd-isas/neon/intrinsics) The intrinsics are declared in arm_bf16.h and arm_neon.h and the RTL patterns are defined in aarch64-simd.md. 2020-03-06 Delia Burduv <delia.burduv@arm.com> gcc/ * config/aarch64/aarch64-simd-builtins.def (bfcvtn): New built-in function. (bfcvtn_q): New built-in function. (bfcvtn2): New built-in function. (bfcvt): New built-in function. * config/aarch64/aarch64-simd.md (aarch64_bfcvtn<q><mode>): New pattern. (aarch64_bfcvtn2v8bf): New pattern. (aarch64_bfcvtbf): New pattern. * config/aarch64/arm_bf16.h (float32_t): New typedef. (vcvth_bf16_f32): New intrinsic. * config/aarch64/arm_bf16.h (vcvt_bf16_f32): New intrinsic. (vcvtq_low_bf16_f32): New intrinsic. (vcvtq_high_bf16_f32): New intrinsic. * config/aarch64/iterators.md (V4SF_TO_BF): New mode iterator. (UNSPEC_BFCVTN): New UNSPEC. (UNSPEC_BFCVTN2): New UNSPEC. (UNSPEC_BFCVT): New UNSPEC. * config/arm/types.md (bf_cvt): New type. gcc/testsuite/ * gcc.target/aarch64/advsimd-intrinsics/bfcvt-compile.c: New test. * gcc.target/aarch64/advsimd-intrinsics/bfcvt-nobf16.c: New test. * gcc.target/aarch64/advsimd-intrinsics/bfcvt-nosimd.c: New test. * gcc.target/aarch64/advsimd-intrinsics/bfcvtnq2-untied.c: New test.
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