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([71.212.149.95]) by smtp.gmail.com with ESMTPSA id ij23-20020a170902ab5700b001c582de968dsm10038433plb.72.2023.10.25.17.15.53 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Oct 2023 17:15:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1698279354; x=1698884154; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=/3tyPErdBidq6AacxwJD8cDdKu9xx4iNX0WzEVUzfVw=; b=J/067aruZyZvE70TK3ULa+HzCEgXHUXIDP9t7r1Hk11grFDVYkUMT61W/P2yKRmMMG C7D+39SdPz+VoUQ5+Rz+Ubg4/P6c4UiHQ+QjAJji4lGsTyOi0aijQEr7bLUDuvOYLPIl 347IzrJaRkA1hGACsnLsr509sObYiSyckC2yTSl7kJ/babrjo18svpwaPibv+WR30DTn 3c8ruly7GABPlCeFip8H1qIenCIZzuKjZVcA2IpYrTL+hzk3TL5wYpi3y9Qqlg8Pxo5X PVW4a4m+QtRl7UP0xFSBTX39FMnUctuKiCJLh343+tnTk1b2Oy5w3L3AAvp6iGLVZcs3 KRLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698279354; x=1698884154; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=/3tyPErdBidq6AacxwJD8cDdKu9xx4iNX0WzEVUzfVw=; b=eTE7k5JzKOEZ9BdC+wB75h9ma8/ELVCK3cH+YM1rWUekXVA/HNtACocYXJ1tnsC2kZ QgHmo02VJppQU/uHPxwyWqNcFKCCRsqgEGihDmO1KwBadepgNqHutGefJByIBR+Iwv9w lyNhWgl+OpuKj4sLGyhIukZxswPdIUGdq+KRVDEH/2LjA+hi1tifAp6R9Zgrp7i0rKYn ccp0FagwSKR+3Era9aQDAGOM3Dv8VmYTM6BzTPB+GgpPY7N0hkGF4ucismwfYwmtkbDE U8PdDQ0gvmoVzFNTIgKouIQKDlQKLRJd5FJ4avJI1f6a9k8RUBPYe68FFTkqqzPNkCtu Mkjw== X-Gm-Message-State: AOJu0YwoWdtsCo+5fn6c/UEhr4dYD2Vw2s3IatcLjG6uYBHiot6BfV3n QFk3gzRzUkZufJl1Yu/z7dD2LDdJZWAH/qg/w7M= X-Google-Smtp-Source: AGHT+IH73VacN0HKtOd5jyyWinWoVMO8NThyjnQyzHpSnA+FU/g09XUq7dxsBfDdBpTdY/wYvwdemA== X-Received: by 2002:a17:903:1210:b0:1c5:d8a3:8789 with SMTP id l16-20020a170903121000b001c5d8a38789mr17803639plh.4.1698279354218; Wed, 25 Oct 2023 17:15:54 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 06/29] tcg/optimize: Handle TCG_COND_TST{EQ,NE} Date: Wed, 25 Oct 2023 17:13:51 -0700 Message-Id: <20231026001542.1141412-13-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231026001542.1141412-1-richard.henderson@linaro.org> References: <20231026001542.1141412-1-richard.henderson@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=2607:f8b0:4864:20::62b; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x62b.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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1698279694155100003 Content-Type: text/plain; charset="utf-8" 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 --- tcg/optimize.c | 225 ++++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 205 insertions(+), 20 deletions(-) diff --git a/tcg/optimize.c b/tcg/optimize.c index 2f2d1c3001..27b1eaaa8d 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -508,9 +508,15 @@ static bool do_constant_folding_cond_32(uint32_t x, ui= nt32_t y, TCGCond c) return x <=3D y; case TCG_COND_GTU: return x > y; - default: - g_assert_not_reached(); + case TCG_COND_TSTEQ: + return (x & y) =3D=3D 0; + case TCG_COND_TSTNE: + return (x & y) !=3D 0; + case TCG_COND_ALWAYS: + case TCG_COND_NEVER: + break; } + g_assert_not_reached(); } =20 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, u= int64_t y, TCGCond c) return x <=3D y; case TCG_COND_GTU: return x > y; - default: - g_assert_not_reached(); + case TCG_COND_TSTEQ: + return (x & y) =3D=3D 0; + case TCG_COND_TSTNE: + return (x & y) !=3D 0; + case TCG_COND_ALWAYS: + case TCG_COND_NEVER: + break; } + g_assert_not_reached(); } =20 -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(); } =20 /* @@ -660,7 +677,27 @@ static int do_constant_folding_cond1(OptContext *ctx, = TCGArg dest, } =20 r =3D do_constant_folding_cond(ctx->type, *p1, *p2, cond); - return r; + if (r >=3D 0) { + return r; + } + if (!is_tst_cond(cond)) { + return -1; + } + + /* TSTNE x,x -> NE x,0 */ + if (args_are_copies(*p1, *p2)) { + *p2 =3D arg_new_constant(ctx, 0); + *pcond =3D tcg_tst_eqne_cond(cond); + return -1; + } + + /* TSTNE x,sign -> LT x,0 */ + if (arg_is_const_val(*p2, (ctx->type =3D=3D TCG_TYPE_I32 + ? INT32_MIN : INT64_MIN))) { + *p2 =3D arg_new_constant(ctx, 0); + *pcond =3D tcg_tst_ltge_cond(cond); + } + return -1; } =20 static int do_constant_folding_cond2(OptContext *ctx, TCGArg *args) @@ -668,6 +705,7 @@ static int do_constant_folding_cond2(OptContext *ctx, T= CGArg *args) TCGArg al, ah, bl, bh; TCGCond c; bool swap; + int r; =20 swap =3D swap_commutative2(args, args + 2); c =3D args[4]; @@ -689,8 +727,13 @@ static int do_constant_folding_cond2(OptContext *ctx, = TCGArg *args) tcg_target_ulong alv =3D arg_info(al)->val; tcg_target_ulong ahv =3D arg_info(ah)->val; uint64_t a =3D deposit64(alv, 32, 32, ahv); - return do_constant_folding_cond_64(a, b, c); + + r =3D do_constant_folding_cond_64(a, b, c); + if (r >=3D 0) { + return r; + } } + if (b =3D=3D 0) { switch (c) { case TCG_COND_LTU: @@ -701,9 +744,28 @@ static int do_constant_folding_cond2(OptContext *ctx, = TCGArg *args) break; } } + + /* TSTNE x,sign -> LT x,0 */ + if (b =3D=3D INT64_MIN && is_tst_cond(c)) { + /* bl must be 0, so copy that to bh */ + args[3] =3D bl; + args[4] =3D 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 =3D do_constant_folding_cond_eq(c); + if (r >=3D 0) { + return r; + } + + /* TSTNE x,x -> NE x,0 */ + if (is_tst_cond(c)) { + args[3] =3D args[2] =3D arg_new_constant(ctx, 0); + args[4] =3D tcg_tst_eqne_cond(c); + return -1; + } } return -1; } @@ -1151,17 +1213,30 @@ static bool fold_brcond2(OptContext *ctx, TCGOp *op) case 0: goto do_brcond_const; case 1: - op->opc =3D INDEX_op_brcond_i32; - op->args[1] =3D op->args[2]; - op->args[2] =3D cond; - op->args[3] =3D 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; =20 default: break; =20 + do_brcond_low: + op->opc =3D INDEX_op_brcond_i32; + op->args[1] =3D op->args[2]; + op->args[2] =3D cond; + op->args[3] =3D label; + break; + do_brcond_high: op->opc =3D INDEX_op_brcond_i32; op->args[0] =3D op->args[1]; @@ -1829,6 +1904,100 @@ static bool fold_remainder(OptContext *ctx, TCGOp *= op) return false; } =20 +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 =3D 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 =3D op->args[2]; + val =3D arg_info(src2)->val; + if (!is_power_of_2(val)) { + return; + } + + switch (ctx->type) { + case TCG_TYPE_I32: + and_opc =3D INDEX_op_and_i32; + sub_opc =3D INDEX_op_sub_i32; + xor_opc =3D INDEX_op_xor_i32; + shr_opc =3D INDEX_op_shr_i32; + neg_opc =3D TCG_TARGET_HAS_neg_i32 ? INDEX_op_neg_i32 : 0; + uext_opc =3D TCG_TARGET_HAS_extract_i32 ? INDEX_op_extract_i32 : 0; + sext_opc =3D TCG_TARGET_HAS_sextract_i32 ? INDEX_op_sextract_i32 := 0; + break; + case TCG_TYPE_I64: + and_opc =3D INDEX_op_and_i64; + sub_opc =3D INDEX_op_sub_i64; + xor_opc =3D INDEX_op_xor_i64; + shr_opc =3D INDEX_op_shr_i64; + neg_opc =3D TCG_TARGET_HAS_neg_i64 ? INDEX_op_neg_i64 : 0; + uext_opc =3D TCG_TARGET_HAS_extract_i64 ? INDEX_op_extract_i64 : 0; + sext_opc =3D TCG_TARGET_HAS_sextract_i64 ? INDEX_op_sextract_i64 := 0; + break; + default: + g_assert_not_reached(); + } + + sh =3D ctz64(val); + ret =3D op->args[0]; + src1 =3D op->args[1]; + inv =3D cond =3D=3D TCG_COND_TSTEQ; + + if (neg && !inv && sext_opc) { + op->opc =3D sext_opc; + op->args[1] =3D src1; + op->args[2] =3D sh; + op->args[3] =3D 1; + neg =3D false; + } else if (uext_opc) { + op->opc =3D uext_opc; + op->args[1] =3D src1; + op->args[2] =3D sh; + op->args[3] =3D 1; + } else { + if (sh) { + op2 =3D tcg_op_insert_before(ctx->tcg, op, shr_opc, 3); + op2->args[0] =3D ret; + op2->args[1] =3D src1; + op2->args[2] =3D arg_new_constant(ctx, sh); + src1 =3D ret; + } + op->opc =3D and_opc; + op->args[1] =3D src1; + op->args[2] =3D arg_new_constant(ctx, 1); + } + + if (neg && inv) { + op2 =3D tcg_op_insert_after(ctx->tcg, op, sub_opc, 3); + op2->args[0] =3D ret; + op2->args[1] =3D ret; + op2->args[2] =3D arg_new_constant(ctx, 1); + } else if (inv) { + op2 =3D tcg_op_insert_after(ctx->tcg, op, xor_opc, 3); + op2->args[0] =3D ret; + op2->args[1] =3D ret; + op2->args[2] =3D arg_new_constant(ctx, 1); + } else if (neg && neg_opc) { + op2 =3D tcg_op_insert_after(ctx->tcg, op, neg_opc, 2); + op2->args[0] =3D ret; + op2->args[1] =3D ret; + } else if (neg) { + op2 =3D tcg_op_insert_after(ctx->tcg, op, sub_opc, 3); + op2->args[0] =3D ret; + op2->args[1] =3D arg_new_constant(ctx, 0); + op2->args[2] =3D ret; + } +} + static bool fold_setcond(OptContext *ctx, TCGOp *op) { int i =3D do_constant_folding_cond1(ctx, op->args[0], &op->args[1], @@ -1836,6 +2005,7 @@ static bool fold_setcond(OptContext *ctx, TCGOp *op) if (i >=3D 0) { return tcg_opt_gen_movi(ctx, op, op->args[0], i); } + fold_setcond_tst_pow2(ctx, op, false); =20 ctx->z_mask =3D 1; ctx->s_mask =3D smask_from_zmask(1); @@ -1849,13 +2019,13 @@ static bool fold_negsetcond(OptContext *ctx, TCGOp = *op) if (i >=3D 0) { return tcg_opt_gen_movi(ctx, op, op->args[0], -i); } + fold_setcond_tst_pow2(ctx, op, true); =20 /* Value is {0,-1} so all bits are repetitions of the sign. */ ctx->s_mask =3D -1; return false; } =20 - static bool fold_setcond2(OptContext *ctx, TCGOp *op) { TCGCond cond; @@ -1903,21 +2073,36 @@ static bool fold_setcond2(OptContext *ctx, TCGOp *o= p) case 0: goto do_setcond_const; case 1: - op->args[2] =3D op->args[3]; - op->args[3] =3D cond; - op->opc =3D 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; =20 default: break; =20 + do_setcond_low: + op->args[2] =3D op->args[3]; + op->args[3] =3D cond; + op->opc =3D INDEX_op_setcond_i32; + fold_setcond_tst_pow2(ctx, op, false); + break; + do_setcond_high: op->args[1] =3D op->args[2]; op->args[2] =3D op->args[4]; op->args[3] =3D cond; op->opc =3D INDEX_op_setcond_i32; + fold_setcond_tst_pow2(ctx, op, false); break; } =20 --=20 2.34.1