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Expand can implement NEG and ABS of scalar floating-point modes by using logic ops to manipulate the sign bit. This patch extends that approach to vectors, since it fits relatively easily into the same structure. The motivating use case was to inline bf16 NEG and ABS operations for AArch64. The patch includes tests for that. get_absneg_bit_mode required a new opt_mode constructor, so that opt_mode<T> can be constructed from opt_mode<U> if T is no less general than U. gcc/ * machmode.h (opt_mode::opt_mode): New overload. * optabs-query.h (get_absneg_bit_mode): Declare. * optabs-query.cc (get_absneg_bit_mode): New function, split out from expand_absneg_bit. (can_open_code_p): Use get_absneg_bit_mode. * optabs.cc (expand_absneg_bit): Likewise. Take an outer and inner mode, rather than just one. Handle vector modes. (expand_unop, expand_abs_nojump): Update calls accordingly. Handle vector modes. gcc/testsuite/ * gcc.target/aarch64/abs_bf_1.c: New test. * gcc.target/aarch64/neg_bf_1.c: Likewise. * gcc.target/aarch64/neg_bf_2.c: Likewise. |
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