From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1923) id 7107A3858D20; Wed, 9 Nov 2022 09:31:56 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 7107A3858D20 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1667986316; bh=fnV3avGSPjL2MvgN46hn/PIUZLO9/qmorewdZ+xNzDI=; h=From:To:Subject:Date:From; b=PJq218Ho15IfRtMjXa9rPfF1iC3rduUygKejf5MIAbbObiJB0qZwaikNDrYEivbF/ AUSMWJHiE5343b3PYdbmECaMo1WGnq4YlkOyuIwCnHIpfBtaH4JTraHKdXJUEx9cO6 dgeh1NU3nQk0kxWnfuiWWLjuWGvdYSRXHkIzuJ6Y= MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" From: Philipp Tomsich To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-3845] RISC-V: costs: handle BSWAP X-Act-Checkin: gcc X-Git-Author: Philipp Tomsich X-Git-Refname: refs/heads/master X-Git-Oldrev: d699d32f47833cfab959a810dad48774c021c677 X-Git-Newrev: e7c8f5005bf87e4bd95b25fb31430eef7e58097e Message-Id: <20221109093156.7107A3858D20@sourceware.org> Date: Wed, 9 Nov 2022 09:31:56 +0000 (GMT) List-Id: https://gcc.gnu.org/g:e7c8f5005bf87e4bd95b25fb31430eef7e58097e commit r13-3845-ge7c8f5005bf87e4bd95b25fb31430eef7e58097e Author: Philipp Tomsich Date: Fri Dec 18 10:00:34 2020 +0100 RISC-V: costs: handle BSWAP The BSWAP operation is not handled in rtx_costs. Add it. With Zbb, BSWAP for XLEN is a single instruction; for smaller modes, it will expand into two. gcc/ChangeLog: * config/riscv/riscv.cc (riscv_rtx_costs): Add BSWAP. Diff: --- gcc/config/riscv/riscv.cc | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc index 32f9ef9ade9..ab6c745c722 100644 --- a/gcc/config/riscv/riscv.cc +++ b/gcc/config/riscv/riscv.cc @@ -2562,6 +2562,16 @@ riscv_rtx_costs (rtx x, machine_mode mode, int outer_code, int opno ATTRIBUTE_UN *total = riscv_extend_cost (XEXP (x, 0), GET_CODE (x) == ZERO_EXTEND); return false; + case BSWAP: + if (TARGET_ZBB) + { + /* RISC-V only defines rev8 for XLEN, so we will need an extra + shift-right instruction for smaller modes. */ + *total = COSTS_N_INSNS (mode == word_mode ? 1 : 2); + return true; + } + return false; + case FLOAT: case UNSIGNED_FLOAT: case FIX: