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[80.41.64.133]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a4f009ff7asm17668852f8f.90.2025.06.03.01.09.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Jun 2025 01:09:44 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: pbonzini@redhat.com Subject: [PATCH v2 03/27] tcg/optimize: Introduce fold_masks_zosa Date: Tue, 3 Jun 2025 09:08:44 +0100 Message-ID: <20250603080908.559594-4-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250603080908.559594-1-richard.henderson@linaro.org> References: <20250603080908.559594-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::430; envelope-from=richard.henderson@linaro.org; helo=mail-wr1-x430.google.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, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add a new function with an affected mask. This will allow folding to a constant to happen before folding to a copy, without having to mind the ordering in all users. Signed-off-by: Richard Henderson --- tcg/optimize.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/tcg/optimize.c b/tcg/optimize.c index ce3cb4d7bc..49ef039932 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -1039,8 +1039,8 @@ static bool fold_const2_commutative(OptContext *ctx, TCGOp *op) * If z_mask allows, fold the output to constant zero. * The passed s_mask may be augmented by z_mask. */ -static bool fold_masks_zos(OptContext *ctx, TCGOp *op, uint64_t z_mask, - uint64_t o_mask, int64_t s_mask) +static bool fold_masks_zosa(OptContext *ctx, TCGOp *op, uint64_t z_mask, + uint64_t o_mask, int64_t s_mask, uint64_t a_mask) { const TCGOpDef *def = &tcg_op_defs[op->opc]; TCGTemp *ts; @@ -1061,6 +1061,7 @@ static bool fold_masks_zos(OptContext *ctx, TCGOp *op, uint64_t z_mask, z_mask = (int32_t)z_mask; o_mask = (int32_t)o_mask; s_mask |= INT32_MIN; + a_mask = (uint32_t)a_mask; } /* Bits that are known 1 and bits that are known 0 must not overlap. */ @@ -1071,6 +1072,11 @@ static bool fold_masks_zos(OptContext *ctx, TCGOp *op, uint64_t z_mask, return tcg_opt_gen_movi(ctx, op, op->args[0], o_mask); } + /* If no bits are affected, the operation devolves to a copy. */ + if (a_mask == 0) { + return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]); + } + ts = arg_temp(op->args[0]); reset_ts(ctx, ts); @@ -1090,17 +1096,17 @@ static bool fold_masks_zos(OptContext *ctx, TCGOp *op, uint64_t z_mask, static bool fold_masks_zs(OptContext *ctx, TCGOp *op, uint64_t z_mask, uint64_t s_mask) { - return fold_masks_zos(ctx, op, z_mask, 0, s_mask); + return fold_masks_zosa(ctx, op, z_mask, 0, s_mask, -1); } static bool fold_masks_z(OptContext *ctx, TCGOp *op, uint64_t z_mask) { - return fold_masks_zos(ctx, op, z_mask, 0, 0); + return fold_masks_zosa(ctx, op, z_mask, 0, 0, -1); } static bool fold_masks_s(OptContext *ctx, TCGOp *op, uint64_t s_mask) { - return fold_masks_zos(ctx, op, -1, 0, s_mask); + return fold_masks_zosa(ctx, op, -1, 0, s_mask, -1); } /* -- 2.43.0