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X-Received-From: 2607:f8b0:4864:20::d44 Subject: [Qemu-devel] [PATCH for-4.1] tcg: Fix constant folding of INDEX_op_extract2_i32 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: christophe.lyon@linaro.org, alex.bennee@linaro.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" On a 64-bit host, discard any replications of the 32-bit sign bit when performing the shift and merge. Fixes: https://bugs.launchpad.net/bugs/1834496 Signed-off-by: Richard Henderson Reviewed-by: Alex Benn=C3=A9e Tested-by: Alex Benn=C3=A9e Tested-by: Christophe Lyon --- tcg/optimize.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tcg/optimize.c b/tcg/optimize.c index d7c71a6085..d2424de4af 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -1213,8 +1213,8 @@ void tcg_optimize(TCGContext *s) if (opc =3D=3D INDEX_op_extract2_i64) { tmp =3D (v1 >> op->args[3]) | (v2 << (64 - op->args[3]= )); } else { - tmp =3D (v1 >> op->args[3]) | (v2 << (32 - op->args[3]= )); - tmp =3D (int32_t)tmp; + tmp =3D (int32_t)(((uint32_t)v1 >> op->args[3]) | + ((uint32_t)v2 << (32 - op->args[3]))); } tcg_opt_gen_movi(s, op, op->args[0], tmp); break; --=20 2.17.1