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Rozycki" To: gcc-patches@gcc.gnu.org cc: Andrew Waterman , Jim Wilson , Kito Cheng , Palmer Dabbelt Subject: [PATCH 14/44] RISC-V: Also invert the cond-move condition for GEU and LEU In-Reply-To: Message-ID: References: User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 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 X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1782969635787963402 X-GMAIL-MSGID: 1782969635787963402 Update `riscv_expand_conditional_move' and handle the missing GEU and LEU operators there, avoiding an extraneous conditional set operation, such as with this output: sgtu a0,a0,a1 seqz a1,a0 czero.eqz a3,a3,a1 czero.nez a1,a2,a1 or a0,a1,a3 produced when optimizing for Zicond targets from: int movsigtu (int w, int x, int y, int z) { return w > x ? y : z; } These operators can be inverted producing optimal code such as this: sgtu a1,a0,a1 czero.nez a3,a3,a1 czero.eqz a1,a2,a1 or a0,a1,a3 which this change causes to happen. gcc/ * config/riscv/riscv.cc (riscv_expand_conditional_move): Also invert the condition for GEU and LEU. --- gcc/config/riscv/riscv.cc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) gcc-riscv-expand-conditional-move-geu-leu.diff Index: gcc/gcc/config/riscv/riscv.cc =================================================================== --- gcc.orig/gcc/config/riscv/riscv.cc +++ gcc/gcc/config/riscv/riscv.cc @@ -4142,7 +4142,7 @@ riscv_expand_conditional_move (rtx dest, /* If riscv_expand_int_scc inverts the condition, then it will flip the value of INVERT. We need to know where so that we can adjust it for our needs. */ - if (code == LE || code == GE) + if (code == LE || code == LEU || code == GE || code == GEU) invert_ptr = &invert; /* Emit an scc like instruction into a temporary