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[81.2.115.148]) by smtp.gmail.com with ESMTPSA id y14sm309918wma.48.2020.10.19.08.13.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Oct 2020 08:13:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=SjAOm7vNdY1fRUdfqYZeeidFWrwzSxpq+qzgfHwNtsM=; b=tALTCdeiFwC/7fynmi9JXz2zPwiHM/TCHffDUEDNeuvHvSJ6BghwLtZx15rlpC4vRy /UKegIHpU8yEcrEyr6hl7BvmGCkybV1zK9u8ZSO35GUnZXDE0xdr9+DXSQ5ZZfniwB7K w5ZH+9nS1NDpVap5Ma1GqcoK4JZRo6CX3Yo4GJK4vfnYnmb8v62tedyFICylQ6NMb/Wi u73mxIBAw2pFFsc6EkBfQzB8QWN+6ebbiZMAnk0HnKNp6Xx5WmFPIhAjfR5oXT4xYDlP adLGlOhJS1lKIV5vNP6BxMWWfhtX2lq4cx87NL7CVuiWDM5Dd6SeopSNfmgxZfciTmMl R5nw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=SjAOm7vNdY1fRUdfqYZeeidFWrwzSxpq+qzgfHwNtsM=; b=pSg+X14Y3S7G4RMsh0niqpVqg+pYXKBaaf33SMBI+/XlPL9SaCNWtTJMr8VzDMdq8X 92WT0jTPNYzfv+ze2YuWxcquQ53skIXm6u/PZwjoDhRS2qR0HscAk4tPA5H1i/TGN5i/ If18OAHR8GkgR7oE+JIoJjbEh9JwJLAdRTqcokKsEWjcKGbHuTCqfxtADmgIlUex7FdL O2tbhjptI4j6DfHAKMkrayUMeXj9BR+MSduiSC9/NfCyx2B6UB7o8CqasQ9OVG0Zj9ej w1oNN86j871sZxZQlV5KwBXB1ykw2E34btDUOcYhvuUOOIoNn7vIrGmNC+TzVEaAn7Km PjYw== X-Gm-Message-State: AOAM533mMwM9tuVBiKDqeWvIb40mLFdIqYHe3IodtH1iQ9JAmbSOXVXX 8ClJjl5FBVDnOxYjj9pOhHOkojmPCcq0Rg== X-Google-Smtp-Source: ABdhPJzzhVtOB3YfRnS/i8zFQmEaLoZsztOShK9Tq92Liv8ea4a8u6+OL4kaOtBQhu5+7nuWJBwVLw== X-Received: by 2002:a1c:ddc2:: with SMTP id u185mr18714567wmg.21.1603120384901; Mon, 19 Oct 2020 08:13:04 -0700 (PDT) From: Peter Maydell To: qemu-arm@nongnu.org, qemu-devel@nongnu.org Subject: [PATCH v2 01/10] decodetree: Fix codegen for non-overlapping group inside overlapping group Date: Mon, 19 Oct 2020 16:12:52 +0100 Message-Id: <20201019151301.2046-2-peter.maydell@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201019151301.2046-1-peter.maydell@linaro.org> References: <20201019151301.2046-1-peter.maydell@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::330; envelope-from=peter.maydell@linaro.org; helo=mail-wm1-x330.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) Content-Type: text/plain; charset="utf-8" For nested groups like: { [ pattern 1 pattern 2 ] pattern 3 } the intended behaviour is that patterns 1 and 2 must not overlap with each other; if the insn matches neither then we fall through to pattern 3 as the next thing in the outer overlapping group. Currently we generate incorrect code for this situation, because in the code path for a failed match inside the inner non-overlapping group we generate a "return" statement, which causes decode to stop entirely rather than continuing to the next thing in the outer group. Generate a "break" instead, so that decode flow behaves as required for this nested group case. Suggested-by: Richard Henderson Reviewed-by: Richard Henderson Signed-off-by: Peter Maydell --- scripts/decodetree.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/scripts/decodetree.py b/scripts/decodetree.py index 60fd3b5e5f6..c1bf3cfa85f 100644 --- a/scripts/decodetree.py +++ b/scripts/decodetree.py @@ -548,7 +548,7 @@ class Tree: output(ind, ' /* ', str_match_bits(innerbits, innermask), ' */\n') s.output_code(i + 4, extracted, innerbits, innermask) - output(ind, ' return false;\n') + output(ind, ' break;\n') output(ind, '}\n') # end Tree =20 --=20 2.20.1