https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112454
--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Andrew Pinski <pins...@gcc.gnu.org>: https://gcc.gnu.org/g:d29d27bde5df89e5357e0a33a71bb49125bd1655 commit r14-5893-gd29d27bde5df89e5357e0a33a71bb49125bd1655 Author: Andrew Pinski <quic_apin...@quicinc.com> Date: Sun Nov 26 23:25:51 2023 +0000 aarch64: Improve cost of `a ? {-,}1 : b` While looking into PR 112454, I found the cost for `(if_then_else (cmp) (const_int 1) (reg))` was being recorded as 8 (or `COSTS_N_INSNS (2)`) but it should have been 4 (or `COSTS_N_INSNS (1)`). This improves the cost by not adding the cost of `(const_int 1)` to the total cost. It does not does not fully fix PR 112454 as that requires other changes to forwprop the `(const_int 1)` earlier than combine. Though we do fix the loop case where the constant was only used once. Bootstrapped and tested on aarch64-linux-gnu with no regressions. gcc/ChangeLog: * config/aarch64/aarch64.cc (aarch64_if_then_else_costs): Handle csinv/csinc case of 1/-1. gcc/testsuite/ChangeLog: * gcc.target/aarch64/csinc-3.c: New test. Signed-off-by: Andrew Pinski <quic_apin...@quicinc.com>
