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Mon, 15 Apr 2024 14:44:45 +0000 Received: from AS8P193MB1285.EURP193.PROD.OUTLOOK.COM ([fe80::5403:f1ad:efaf:1f71]) by AS8P193MB1285.EURP193.PROD.OUTLOOK.COM ([fe80::5403:f1ad:efaf:1f71%4]) with mapi id 15.20.7452.049; Mon, 15 Apr 2024 14:44:45 +0000 Message-ID: Date: Mon, 15 Apr 2024 16:46:37 +0200 User-Agent: Mozilla Thunderbird Content-Language: en-US To: "gdb-patches@sourceware.org" From: Bernd Edlinger Subject: [PATCH 1/2] sim: riscv: fix a divw division by -1 bug X-TMN: [Zt/pDQj5RjJM0lgK29wUyu9l4Xuk5mFwfhRWrxhaUz2wvB9XOGvADsJJgLUW7J5r] X-ClientProxiedBy: FR3P281CA0210.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:a5::19) To AS8P193MB1285.EURP193.PROD.OUTLOOK.COM (2603:10a6:20b:333::21) X-Microsoft-Original-Message-ID: <61f642db-5ede-4469-a1e6-29f1700afce9@hotmail.de> MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AS8P193MB1285:EE_|AS8P193MB1205:EE_ X-MS-Office365-Filtering-Correlation-Id: 4c2e9b5c-943c-4a3f-d16b-08dc5d5a9764 X-Microsoft-Antispam: BCL:0; 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It did not affect the rv32 target, because these instructions are rv64 only. Since 1 << 31 is an integer overflow this avoids an undefined behaviour bug at the same time. This caused test failures in the gcc testsuite like: FAIL: gcc.c-torture/execute/arith-rand-ll.c -O0 execution test FAIL: gcc.c-torture/execute/arith-rand-ll.c -O1 execution test FAIL: gcc.c-torture/execute/arith-rand-ll.c -O2 execution test FAIL: gcc.c-torture/execute/arith-rand-ll.c -O3 execution test FAIL: gcc.c-torture/execute/arith-rand.c -O0 execution test FAIL: gcc.c-torture/execute/arith-rand.c -O1 execution test FAIL: gcc.c-torture/execute/arith-rand.c -O2 execution test FAIL: gcc.c-torture/execute/arith-rand.c -O3 execution test ... --- sim/riscv/sim-main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sim/riscv/sim-main.c b/sim/riscv/sim-main.c index c8adb65139b..515ff835223 100644 --- a/sim/riscv/sim-main.c +++ b/sim/riscv/sim-main.c @@ -724,7 +724,7 @@ execute_m (SIM_CPU *cpu, unsigned_word iw, const struct riscv_opcode *op) rd_name, rs1_name, rs2_name, rd_name, rs1_name, rs2_name); RISCV_ASSERT_RV64 (cpu, "insn: %s", op->name); if (EXTEND32 (riscv_cpu->regs[rs2]) == -1) - tmp = 1 << 31; + tmp = EXTEND32 (-(uint32_t) riscv_cpu->regs[rs1]); else if (EXTEND32 (riscv_cpu->regs[rs2])) tmp = EXTEND32 (riscv_cpu->regs[rs1]) / EXTEND32 (riscv_cpu->regs[rs2]); else From patchwork Mon Apr 15 14:46:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bernd Edlinger X-Patchwork-Id: 88496 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 6975D3858C41 for ; Mon, 15 Apr 2024 14:45:33 +0000 (GMT) X-Original-To: gdb-patches@sourceware.org Delivered-To: gdb-patches@sourceware.org Received: from EUR05-DB8-obe.outbound.protection.outlook.com (mail-db8eur05olkn2033.outbound.protection.outlook.com [40.92.89.33]) by sourceware.org (Postfix) with ESMTPS id E71673858410 for ; Mon, 15 Apr 2024 14:45:08 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org E71673858410 Authentication-Results: sourceware.org; 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This is no bug-fix but it simplifies the code and avoids some unnecessary branches. --- sim/riscv/sim-main.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/sim/riscv/sim-main.c b/sim/riscv/sim-main.c index 515ff835223..e4b15b533ba 100644 --- a/sim/riscv/sim-main.c +++ b/sim/riscv/sim-main.c @@ -700,18 +700,16 @@ execute_m (SIM_CPU *cpu, unsigned_word iw, const struct riscv_opcode *op) const char *rd_name = riscv_gpr_names_abi[rd]; const char *rs1_name = riscv_gpr_names_abi[rs1]; const char *rs2_name = riscv_gpr_names_abi[rs2]; - unsigned_word tmp, dividend_max; + unsigned_word tmp; sim_cia pc = riscv_cpu->pc + 4; - dividend_max = -((unsigned_word) 1 << (WITH_TARGET_WORD_BITSIZE - 1)); - switch (op->match) { case MATCH_DIV: TRACE_INSN (cpu, "div %s, %s, %s; // %s = %s / %s", rd_name, rs1_name, rs2_name, rd_name, rs1_name, rs2_name); - if (riscv_cpu->regs[rs1] == dividend_max && riscv_cpu->regs[rs2] == -1) - tmp = dividend_max; + if (riscv_cpu->regs[rs2] == -1) + tmp = -riscv_cpu->regs[rs1]; else if (riscv_cpu->regs[rs2]) tmp = (signed_word) riscv_cpu->regs[rs1] / (signed_word) riscv_cpu->regs[rs2]; @@ -793,7 +791,7 @@ execute_m (SIM_CPU *cpu, unsigned_word iw, const struct riscv_opcode *op) case MATCH_REM: TRACE_INSN (cpu, "rem %s, %s, %s; // %s = %s %% %s", rd_name, rs1_name, rs2_name, rd_name, rs1_name, rs2_name); - if (riscv_cpu->regs[rs1] == dividend_max && riscv_cpu->regs[rs2] == -1) + if (riscv_cpu->regs[rs2] == -1) tmp = 0; else if (riscv_cpu->regs[rs2]) tmp = (signed_word) riscv_cpu->regs[rs1]