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Rozycki" To: gcc-patches@gcc.gnu.org cc: Andrew Waterman , Jim Wilson , Kito Cheng , Palmer Dabbelt Subject: [PATCH 20/44] RISC-V: Also accept constants for T-Head cond-move comparison operands In-Reply-To: Message-ID: References: User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Spam-Status: No, score=-1.7 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE,URIBL_BLACK autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: There is no need for the requirement for conditional-move comparison operands to be stricter for T-Head targets than for other targets and limit them to registers only. Constants will be reloaded if required just as with branches or other-target conditional-move operations and there is no extra overhead specific to the T-Head case. This enables more opportunities for a branchless sequence to be produced. gcc/ * config/riscv/riscv.cc (riscv_expand_conditional_move): Also accept constants for T-Head comparison operands. --- gcc/config/riscv/riscv.cc | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) gcc-riscv-expand-conditional-move-thead-op.diff Index: gcc/gcc/config/riscv/riscv.cc =================================================================== --- gcc.orig/gcc/config/riscv/riscv.cc +++ gcc/gcc/config/riscv/riscv.cc @@ -4097,8 +4097,8 @@ riscv_expand_conditional_move (rtx dest, && reg_or_0_operand (cons, mode) && reg_or_0_operand (alt, mode) && (GET_MODE (op) == mode || GET_MODE (op) == E_VOIDmode) - && GET_MODE (op0) == mode - && GET_MODE (op1) == mode + && (GET_MODE (op0) == mode || CONST_INT_P (op0)) + && (GET_MODE (op1) == mode || CONST_INT_P (op1)) && (code == EQ || code == NE)) need_eq_ne_p = true;