From patchwork Sat Oct 28 19:44:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 738953 Delivered-To: patch@linaro.org Received: by 2002:a5d:4c47:0:b0:32d:baff:b0ca with SMTP id n7csp481091wrt; Sat, 28 Oct 2023 12:47:33 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGXo4NwXvbIY/NJtJEAbQWhPaAaNFzsGKub7Owb0W7ZGH76nI9dJKHPDbyvNXgj9uAgITts X-Received: by 2002:a05:622a:6:b0:41c:dc85:1c17 with SMTP id x6-20020a05622a000600b0041cdc851c17mr7491014qtw.66.1698522453194; Sat, 28 Oct 2023 12:47:33 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1698522453; cv=none; d=google.com; s=arc-20160816; b=JJQnO4UNnW7kHcposua6qyZzmYPtVQWjNxG0w/B4zuklRY+LQEkVkzZtxF5QFLG7bx ULY9geoA5dv00uK3VDvWZhg5So4+9B36Ny/nwmQveHxd5mKUMXVBMof32GumfiCcDpzC ww5LJnZJviZaPCARLRWhkW5gCUGplzJ6922Hx25yaCbZQybEWWOHudugQ3i4+t+GDefp va93s4PWLUGgU3dzbmnf1Am/C8e7YETPkdXrjMr6LM/mzdBy+A2awBFj7j0SfN3wQ5P5 BZ7aiKXOy9K8JjVU6zP08K9HUzhCLdmrKaJF0O9U/tGUAwUcRx/mf4lqWkNGBOd0jvqm 7EDQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:list-subscribe:list-help:list-post:list-archive :list-unsubscribe:list-id:precedence:content-transfer-encoding :mime-version:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=k5lsHDsasK4zIrruyQZlXl4wlS973HJoMzMc8iwOmM4=; fh=GbSB792CRg76qyQfASHmg380JBauy2gTuYi49sbOwBU=; b=kZtsprNCfDtnd1b49IM56WRvbGAWUuV75QpMNW0CRLz9VMa7vgOwL6VMcj+C5YYdIK Jl3o0rADx9WbmFzUph2B3iNcnVcPbr1pbASD7c4t5dgkDoT5mb2MUzS/lQFPzZw9Lmzr iN9jCkjaiJanaMe7ixJ5yVo1Y25uoIWum7L5PCrXG+kmPMOSIL2Jw23Vq3Yzw/iGWmwu mLp0HA09OZvkknALfvVl7VfLTCm0nPV46O2hJjwr33cdNWryZl07Ps1RGYCp7EuTrVX8 dqYaQvmInC0Zr3QACaprL76Js4dPeJoq1Z5/pwnutP7v1mBxPG+dhBc7YelQWl2davt0 9g2w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=yzpQrP4w; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from lists.gnu.org (lists.gnu.org. [209.51.188.17]) by mx.google.com with ESMTPS id l18-20020a05622a051200b00403332e2e31si2815258qtx.559.2023.10.28.12.47.33 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Sat, 28 Oct 2023 12:47:33 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=yzpQrP4w; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qwpFr-0004nz-PD; Sat, 28 Oct 2023 15:45:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qwpFX-0004ie-J7 for qemu-devel@nongnu.org; Sat, 28 Oct 2023 15:45:35 -0400 Received: from mail-io1-xd30.google.com ([2607:f8b0:4864:20::d30]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qwpFU-00046S-Ir for qemu-devel@nongnu.org; Sat, 28 Oct 2023 15:45:35 -0400 Received: by mail-io1-xd30.google.com with SMTP id ca18e2360f4ac-7a68b87b265so97169139f.2 for ; Sat, 28 Oct 2023 12:45:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1698522330; x=1699127130; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=k5lsHDsasK4zIrruyQZlXl4wlS973HJoMzMc8iwOmM4=; b=yzpQrP4wpnU9pgkOoqER6fXyN3hbtTHTtczyGf/R0X/XF4KWYJo8y1QeJPm92d4F/8 oGcspEW9Q9MKqPW/6EGG8u1MgJqaw/GIlvCtaN3CM0HNyDewVYJoSDZidmbpPfNJIGMb sfU1vgB6J66ToQGnXVfFJRwNxcICTc+rpxJxhZ0rc1UoAvTIITgUP6eT4H2Wqh4OVjlb T7j1ZDoHTodeS0FrUwjnKizgkoIhO7kqiUaEe4sFLFwy2HQbA32m/gyNsOr2h4BU68ry ZaTrOPJIj/z8ShXI03lp/1Z5I5xYT3wD5HLOsXCFSpxMV+mYt83F6x0q41W/Md+COocT 6meA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698522330; x=1699127130; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=k5lsHDsasK4zIrruyQZlXl4wlS973HJoMzMc8iwOmM4=; b=sAegQKBwVxcXkAaldvoPK+MH8tLUpR+6/NBM8O3qFsDB7K5RapVbkMTo3XkBIpXhln wy2Xg1ASxxYJ6/UUpyQo/GQ+3pejqS5i520an3KcLK+33MRVFVYNcBTE+uFKQI+LGHEZ a+RPdC1BPna25TFQoTrnMooSYh+NCKdg33dAYovxnccUrKFomnnDLUZozUoux/PySRu3 OBhHwnldcNgUvqw9hm/PMIXyv7Bjjmd9Q204rxCkiY6Aydb33NWUPVmt4M9POKeC5lMV n5BYfG7ckV66YX83ozK8vB3u1522ngUnSJzQiKqCSbdl0fI0/DL7azg/iWcvgWJTW4Ha GjIQ== X-Gm-Message-State: AOJu0YxTXjp5wdkV1wDwwtQCaOT7FdwoUw6MFWfqruyEHHQRNVQuZ/s+ vTZeNc8tLciVPSSGkLMP4eEs3MqthrqQH2cTXaM= X-Received: by 2002:a05:6e02:1be7:b0:357:a25a:572a with SMTP id y7-20020a056e021be700b00357a25a572amr9930623ilv.21.1698522330043; Sat, 28 Oct 2023 12:45:30 -0700 (PDT) Received: from stoup.. ([71.212.149.95]) by smtp.gmail.com with ESMTPSA id h9-20020a170902f7c900b001b8a3e2c241sm3600096plw.14.2023.10.28.12.45.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 28 Oct 2023 12:45:29 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: philmd@linaro.org, pbonzini@redhat.com Subject: [PATCH v2 06/35] tcg/optimize: Handle TCG_COND_TST{EQ,NE} Date: Sat, 28 Oct 2023 12:44:53 -0700 Message-Id: <20231028194522.245170-7-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231028194522.245170-1-richard.henderson@linaro.org> References: <20231028194522.245170-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::d30; envelope-from=richard.henderson@linaro.org; helo=mail-io1-xd30.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+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org Fold constant comparisons. Canonicalize "tst x,x" to equality vs zero. Canonicalize "tst x,sign" to sign test vs zero. Fold double-word comparisons with zero parts. Fold setcond of "tst x,pow2" to a bit extract. Signed-off-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daudé --- tcg/optimize.c | 245 ++++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 223 insertions(+), 22 deletions(-) diff --git a/tcg/optimize.c b/tcg/optimize.c index 2f2d1c3001..891c28acef 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -508,9 +508,15 @@ static bool do_constant_folding_cond_32(uint32_t x, uint32_t y, TCGCond c) return x <= y; case TCG_COND_GTU: return x > y; - default: - g_assert_not_reached(); + case TCG_COND_TSTEQ: + return (x & y) == 0; + case TCG_COND_TSTNE: + return (x & y) != 0; + case TCG_COND_ALWAYS: + case TCG_COND_NEVER: + break; } + g_assert_not_reached(); } static bool do_constant_folding_cond_64(uint64_t x, uint64_t y, TCGCond c) @@ -536,12 +542,18 @@ static bool do_constant_folding_cond_64(uint64_t x, uint64_t y, TCGCond c) return x <= y; case TCG_COND_GTU: return x > y; - default: - g_assert_not_reached(); + case TCG_COND_TSTEQ: + return (x & y) == 0; + case TCG_COND_TSTNE: + return (x & y) != 0; + case TCG_COND_ALWAYS: + case TCG_COND_NEVER: + break; } + g_assert_not_reached(); } -static bool do_constant_folding_cond_eq(TCGCond c) +static int do_constant_folding_cond_eq(TCGCond c) { switch (c) { case TCG_COND_GT: @@ -556,9 +568,14 @@ static bool do_constant_folding_cond_eq(TCGCond c) case TCG_COND_LEU: case TCG_COND_EQ: return 1; - default: - g_assert_not_reached(); + case TCG_COND_TSTEQ: + case TCG_COND_TSTNE: + return -1; + case TCG_COND_ALWAYS: + case TCG_COND_NEVER: + break; } + g_assert_not_reached(); } /* @@ -586,8 +603,10 @@ static int do_constant_folding_cond(TCGType type, TCGArg x, } else if (arg_is_const_val(y, 0)) { switch (c) { case TCG_COND_LTU: + case TCG_COND_TSTNE: return 0; case TCG_COND_GEU: + case TCG_COND_TSTEQ: return 1; default: return -1; @@ -660,7 +679,30 @@ static int do_constant_folding_cond1(OptContext *ctx, TCGArg dest, } r = do_constant_folding_cond(ctx->type, *p1, *p2, cond); - return r; + if (r >= 0) { + return r; + } + if (!is_tst_cond(cond)) { + return -1; + } + + /* + * TSTNE x,x -> NE x,0 + * TSTNE x,-1 -> NE x,0 + */ + if (args_are_copies(*p1, *p2) || arg_is_const_val(*p2, -1)) { + *p2 = arg_new_constant(ctx, 0); + *pcond = tcg_tst_eqne_cond(cond); + return -1; + } + + /* TSTNE x,sign -> LT x,0 */ + if (arg_is_const_val(*p2, (ctx->type == TCG_TYPE_I32 + ? INT32_MIN : INT64_MIN))) { + *p2 = arg_new_constant(ctx, 0); + *pcond = tcg_tst_ltge_cond(cond); + } + return -1; } static int do_constant_folding_cond2(OptContext *ctx, TCGArg *args) @@ -668,6 +710,7 @@ static int do_constant_folding_cond2(OptContext *ctx, TCGArg *args) TCGArg al, ah, bl, bh; TCGCond c; bool swap; + int r; swap = swap_commutative2(args, args + 2); c = args[4]; @@ -689,21 +732,54 @@ static int do_constant_folding_cond2(OptContext *ctx, TCGArg *args) tcg_target_ulong alv = arg_info(al)->val; tcg_target_ulong ahv = arg_info(ah)->val; uint64_t a = deposit64(alv, 32, 32, ahv); - return do_constant_folding_cond_64(a, b, c); + + r = do_constant_folding_cond_64(a, b, c); + if (r >= 0) { + return r; + } } + if (b == 0) { switch (c) { case TCG_COND_LTU: + case TCG_COND_TSTNE: return 0; case TCG_COND_GEU: + case TCG_COND_TSTEQ: return 1; default: break; } } + + /* TSTNE x,-1 -> NE x,0 */ + if (b == -1 && is_tst_cond(c)) { + args[3] = args[2] = arg_new_constant(ctx, 0); + args[4] = tcg_tst_eqne_cond(c); + return -1; + } + + /* TSTNE x,sign -> LT x,0 */ + if (b == INT64_MIN && is_tst_cond(c)) { + /* bl must be 0, so copy that to bh */ + args[3] = bl; + args[4] = tcg_tst_ltge_cond(c); + return -1; + } } + if (args_are_copies(al, bl) && args_are_copies(ah, bh)) { - return do_constant_folding_cond_eq(c); + r = do_constant_folding_cond_eq(c); + if (r >= 0) { + return r; + } + + /* TSTNE x,x -> NE x,0 */ + if (is_tst_cond(c)) { + args[3] = args[2] = arg_new_constant(ctx, 0); + args[4] = tcg_tst_eqne_cond(c); + return -1; + } } return -1; } @@ -1151,24 +1227,37 @@ static bool fold_brcond2(OptContext *ctx, TCGOp *op) case 0: goto do_brcond_const; case 1: - op->opc = INDEX_op_brcond_i32; - op->args[1] = op->args[2]; - op->args[2] = cond; - op->args[3] = label; - break; + goto do_brcond_low; + } + break; + + case TCG_COND_TSTEQ: + case TCG_COND_TSTNE: + if (arg_is_const_val(op->args[2], 0)) { + goto do_brcond_high; + } + if (arg_is_const_val(op->args[3], 0)) { + goto do_brcond_low; } break; default: break; + do_brcond_low: + op->opc = INDEX_op_brcond_i32; + op->args[1] = op->args[2]; + op->args[2] = cond; + op->args[3] = label; + return fold_brcond(ctx, op); + do_brcond_high: op->opc = INDEX_op_brcond_i32; op->args[0] = op->args[1]; op->args[1] = op->args[3]; op->args[2] = cond; op->args[3] = label; - break; + return fold_brcond(ctx, op); do_brcond_const: if (i == 0) { @@ -1829,6 +1918,104 @@ static bool fold_remainder(OptContext *ctx, TCGOp *op) return false; } +static void fold_setcond_tst_pow2(OptContext *ctx, TCGOp *op, bool neg) +{ + TCGOpcode and_opc, sub_opc, xor_opc, neg_opc, shr_opc, uext_opc, sext_opc; + TCGCond cond = op->args[3]; + TCGArg ret, src1, src2; + TCGOp *op2; + uint64_t val; + int sh; + bool inv; + + if (!is_tst_cond(cond) || !arg_is_const(op->args[2])) { + return; + } + + src2 = op->args[2]; + val = arg_info(src2)->val; + if (!is_power_of_2(val)) { + return; + } + sh = ctz64(val); + + switch (ctx->type) { + case TCG_TYPE_I32: + and_opc = INDEX_op_and_i32; + sub_opc = INDEX_op_sub_i32; + xor_opc = INDEX_op_xor_i32; + shr_opc = INDEX_op_shr_i32; + neg_opc = TCG_TARGET_HAS_neg_i32 ? INDEX_op_neg_i32 : 0; + if (TCG_TARGET_extract_i32_valid(sh, 1)) { + uext_opc = TCG_TARGET_HAS_extract_i32 ? INDEX_op_extract_i32 : 0; + sext_opc = TCG_TARGET_HAS_sextract_i32 ? INDEX_op_sextract_i32 : 0; + } + break; + case TCG_TYPE_I64: + and_opc = INDEX_op_and_i64; + sub_opc = INDEX_op_sub_i64; + xor_opc = INDEX_op_xor_i64; + shr_opc = INDEX_op_shr_i64; + neg_opc = TCG_TARGET_HAS_neg_i64 ? INDEX_op_neg_i64 : 0; + if (TCG_TARGET_extract_i64_valid(sh, 1)) { + uext_opc = TCG_TARGET_HAS_extract_i64 ? INDEX_op_extract_i64 : 0; + sext_opc = TCG_TARGET_HAS_sextract_i64 ? INDEX_op_sextract_i64 : 0; + } + break; + default: + g_assert_not_reached(); + } + + ret = op->args[0]; + src1 = op->args[1]; + inv = cond == TCG_COND_TSTEQ; + + if (sh && sext_opc && neg && !inv) { + op->opc = sext_opc; + op->args[1] = src1; + op->args[2] = sh; + op->args[3] = 1; + return; + } else if (sh && uext_opc) { + op->opc = uext_opc; + op->args[1] = src1; + op->args[2] = sh; + op->args[3] = 1; + } else { + if (sh) { + op2 = tcg_op_insert_before(ctx->tcg, op, shr_opc, 3); + op2->args[0] = ret; + op2->args[1] = src1; + op2->args[2] = arg_new_constant(ctx, sh); + src1 = ret; + } + op->opc = and_opc; + op->args[1] = src1; + op->args[2] = arg_new_constant(ctx, 1); + } + + if (neg && inv) { + op2 = tcg_op_insert_after(ctx->tcg, op, sub_opc, 3); + op2->args[0] = ret; + op2->args[1] = ret; + op2->args[2] = arg_new_constant(ctx, 1); + } else if (inv) { + op2 = tcg_op_insert_after(ctx->tcg, op, xor_opc, 3); + op2->args[0] = ret; + op2->args[1] = ret; + op2->args[2] = arg_new_constant(ctx, 1); + } else if (neg && neg_opc) { + op2 = tcg_op_insert_after(ctx->tcg, op, neg_opc, 2); + op2->args[0] = ret; + op2->args[1] = ret; + } else if (neg) { + op2 = tcg_op_insert_after(ctx->tcg, op, sub_opc, 3); + op2->args[0] = ret; + op2->args[1] = arg_new_constant(ctx, 0); + op2->args[2] = ret; + } +} + static bool fold_setcond(OptContext *ctx, TCGOp *op) { int i = do_constant_folding_cond1(ctx, op->args[0], &op->args[1], @@ -1836,6 +2023,7 @@ static bool fold_setcond(OptContext *ctx, TCGOp *op) if (i >= 0) { return tcg_opt_gen_movi(ctx, op, op->args[0], i); } + fold_setcond_tst_pow2(ctx, op, false); ctx->z_mask = 1; ctx->s_mask = smask_from_zmask(1); @@ -1849,13 +2037,13 @@ static bool fold_negsetcond(OptContext *ctx, TCGOp *op) if (i >= 0) { return tcg_opt_gen_movi(ctx, op, op->args[0], -i); } + fold_setcond_tst_pow2(ctx, op, true); /* Value is {0,-1} so all bits are repetitions of the sign. */ ctx->s_mask = -1; return false; } - static bool fold_setcond2(OptContext *ctx, TCGOp *op) { TCGCond cond; @@ -1903,22 +2091,35 @@ static bool fold_setcond2(OptContext *ctx, TCGOp *op) case 0: goto do_setcond_const; case 1: - op->args[2] = op->args[3]; - op->args[3] = cond; - op->opc = INDEX_op_setcond_i32; - break; + goto do_setcond_low; + } + break; + + case TCG_COND_TSTEQ: + case TCG_COND_TSTNE: + if (arg_is_const_val(op->args[2], 0)) { + goto do_setcond_high; + } + if (arg_is_const_val(op->args[4], 0)) { + goto do_setcond_low; } break; default: break; + do_setcond_low: + op->args[2] = op->args[3]; + op->args[3] = cond; + op->opc = INDEX_op_setcond_i32; + return fold_setcond(ctx, op); + do_setcond_high: op->args[1] = op->args[2]; op->args[2] = op->args[4]; op->args[3] = cond; op->opc = INDEX_op_setcond_i32; - break; + return fold_setcond(ctx, op); } ctx->z_mask = 1;