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This patch implements the __jcvt ACLE intrinsic [1] that maps down to the FJCVTZS [2] instruction from Armv8.3-a. No fancy mode iterators or nothing. Just a single builtin, UNSPEC and define_insn and the associate plumbing. This patch also defines __ARM_FEATURE_JCVT to indicate when the intrinsic is available. [1] https://developer.arm.com/docs/101028/latest/data-processing-intrinsics [2] https://developer.arm.com/docs/ddi0596/latest/simd-and-floating-point-instructions-alphabetic-order/fjcvtzs-floating-point-javascript-convert-to-signed-fixed-point-rounding-toward-zero * config/aarch64/aarch64.md (UNSPEC_FJCVTZS): Define. (aarch64_fjcvtzs): New define_insn. * config/aarch64/aarch64.h (TARGET_JSCVT): Define. * config/aarch64/aarch64-builtins.c (aarch64_builtins): Add AARCH64_JSCVT. (aarch64_init_builtins): Initialize __builtin_aarch64_jcvtzs. (aarch64_expand_builtin): Handle AARCH64_JSCVT. * config/aarch64/aarch64-c.c (aarch64_update_cpp_builtins): Define __ARM_FEATURE_JCVT where appropriate. * config/aarch64/arm_acle.h (__jcvt): Define. * gcc.target/aarch64/acle/jcvt_1.c: New test. From-SVN: r275335
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