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Tue, 23 Dec 2025 08:37:23 -0800 (PST) X-Google-Smtp-Source: AGHT+IGliMThg+MTDQu+lINVGPR3Qgsmf59oRg9b3SCb1JvwFvphoaGAM7Oof/GFpLRk6CXscBowaw== X-Received: by 2002:a17:907:c0f:b0:b79:fca2:ac0f with SMTP id a640c23a62f3a-b80371da6cbmr1426189366b.38.1766507843032; Tue, 23 Dec 2025 08:37:23 -0800 (PST) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: richard.henderson@linaro.org Subject: [PATCH for-11.0] tcg/optimize: do use affected bits Date: Tue, 23 Dec 2025 17:37:20 +0100 Message-ID: <20251223163720.985578-1-pbonzini@redhat.com> X-Mailer: git-send-email 2.52.0 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 (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=170.10.133.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com 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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1766507894345158500 Content-Type: text/plain; charset="utf-8" Commit 932522a9ddc ("tcg/optimize: Fold and to extract during optimize", 2025-06-30) inadvertently disabled affected bits optimizations on operations that use fold_masks_zosa. These happen relatively often in x86 code for extract/sextract; for example given the following: mov %esi, %ebp xor $0x1, %ebp the optimizer is able to simplify the "extract_i64 rbp,tmp0,$0x0,$0x20" produced by the second instruction to a move. Signed-off-by: Paolo Bonzini Reviewed-by: Richard Henderson --- tcg/optimize.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tcg/optimize.c b/tcg/optimize.c index f69702b26e8..c546e8910ba 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -1102,7 +1102,7 @@ static bool fold_masks_zosa_int(OptContext *ctx, TCGO= p *op, static bool fold_masks_zosa(OptContext *ctx, TCGOp *op, uint64_t z_mask, uint64_t o_mask, int64_t s_mask, uint64_t a_ma= sk) { - fold_masks_zosa_int(ctx, op, z_mask, o_mask, s_mask, -1); + fold_masks_zosa_int(ctx, op, z_mask, o_mask, s_mask, a_mask); return true; } =20 --=20 2.52.0