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([71.212.149.95]) by smtp.gmail.com with ESMTPSA id fn11-20020a056a002fcb00b006bff7c36fb3sm6367478pfb.95.2023.11.06.18.48.58 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 18:48:58 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 20/35] tcg/mips: Split out tcg_out_setcond_int Date: Mon, 6 Nov 2023 18:48:27 -0800 Message-Id: <20231107024842.7650-21-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231107024842.7650-1-richard.henderson@linaro.org> References: <20231107024842.7650-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::230; envelope-from=richard.henderson@linaro.org; helo=mail-oi1-x230.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, T_SCC_BODY_TEXT_LINE=-0.01 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 Return the temp and a set of flags, to be used as a primitive for setcond, brcond, movcond. Signed-off-by: Richard Henderson Message-Id: <20231026041404.1229328-2-richard.henderson@linaro.org> --- tcg/mips/tcg-target.c.inc | 302 +++++++++++++++----------------------- 1 file changed, 118 insertions(+), 184 deletions(-) diff --git a/tcg/mips/tcg-target.c.inc b/tcg/mips/tcg-target.c.inc index 328984ccff..89681f00fe 100644 --- a/tcg/mips/tcg-target.c.inc +++ b/tcg/mips/tcg-target.c.inc @@ -871,71 +871,83 @@ static void tcg_out_addsub2(TCGContext *s, TCGReg rl, TCGReg rh, TCGReg al, } } -/* Bit 0 set if inversion required; bit 1 set if swapping required. */ -#define MIPS_CMP_INV 1 -#define MIPS_CMP_SWAP 2 +#define SETCOND_INV TCG_TARGET_NB_REGS +#define SETCOND_NEZ (SETCOND_INV << 1) +#define SETCOND_FLAGS (SETCOND_INV | SETCOND_NEZ) -static const uint8_t mips_cmp_map[16] = { - [TCG_COND_LT] = 0, - [TCG_COND_LTU] = 0, - [TCG_COND_GE] = MIPS_CMP_INV, - [TCG_COND_GEU] = MIPS_CMP_INV, - [TCG_COND_LE] = MIPS_CMP_INV | MIPS_CMP_SWAP, - [TCG_COND_LEU] = MIPS_CMP_INV | MIPS_CMP_SWAP, - [TCG_COND_GT] = MIPS_CMP_SWAP, - [TCG_COND_GTU] = MIPS_CMP_SWAP, -}; +static int tcg_out_setcond_int(TCGContext *s, TCGCond cond, TCGReg ret, + TCGReg arg1, TCGReg arg2) +{ + int flags = 0; + + switch (cond) { + case TCG_COND_EQ: /* -> NE */ + case TCG_COND_GE: /* -> LT */ + case TCG_COND_GEU: /* -> LTU */ + case TCG_COND_LE: /* -> GT */ + case TCG_COND_LEU: /* -> GTU */ + cond = tcg_invert_cond(cond); + flags ^= SETCOND_INV; + break; + default: + break; + } + + switch (cond) { + case TCG_COND_NE: + flags |= SETCOND_NEZ; + if (arg2 == 0) { + return arg1 | flags; + } + tcg_out_opc_reg(s, OPC_XOR, ret, arg1, arg2); + break; + case TCG_COND_LT: + tcg_out_opc_reg(s, OPC_SLT, ret, arg1, arg2); + break; + case TCG_COND_LTU: + tcg_out_opc_reg(s, OPC_SLTU, ret, arg1, arg2); + break; + case TCG_COND_GT: + tcg_out_opc_reg(s, OPC_SLT, ret, arg2, arg1); + break; + case TCG_COND_GTU: + tcg_out_opc_reg(s, OPC_SLTU, ret, arg2, arg1); + break; + default: + g_assert_not_reached(); + } + return ret | flags; +} + +static void tcg_out_setcond_end(TCGContext *s, TCGReg ret, int tmpflags) +{ + if (tmpflags != ret) { + TCGReg tmp = tmpflags & ~SETCOND_FLAGS; + + switch (tmpflags & SETCOND_FLAGS) { + case SETCOND_INV: + /* Intermediate result is boolean: simply invert. */ + tcg_out_opc_imm(s, OPC_XORI, ret, tmp, 1); + break; + case SETCOND_NEZ: + /* Intermediate result is zero/non-zero: test != 0. */ + tcg_out_opc_reg(s, OPC_SLTU, ret, TCG_REG_ZERO, tmp); + break; + case SETCOND_NEZ | SETCOND_INV: + /* Intermediate result is zero/non-zero: test == 0. */ + tcg_out_opc_imm(s, OPC_SLTIU, ret, tmp, 1); + break; + default: + g_assert_not_reached(); + } + } +} static void tcg_out_setcond(TCGContext *s, TCGCond cond, TCGReg ret, TCGReg arg1, TCGReg arg2) { - MIPSInsn s_opc = OPC_SLTU; - int cmp_map; - - switch (cond) { - case TCG_COND_EQ: - if (arg2 != 0) { - tcg_out_opc_reg(s, OPC_XOR, ret, arg1, arg2); - arg1 = ret; - } - tcg_out_opc_imm(s, OPC_SLTIU, ret, arg1, 1); - break; - - case TCG_COND_NE: - if (arg2 != 0) { - tcg_out_opc_reg(s, OPC_XOR, ret, arg1, arg2); - arg1 = ret; - } - tcg_out_opc_reg(s, OPC_SLTU, ret, TCG_REG_ZERO, arg1); - break; - - case TCG_COND_LT: - case TCG_COND_GE: - case TCG_COND_LE: - case TCG_COND_GT: - s_opc = OPC_SLT; - /* FALLTHRU */ - - case TCG_COND_LTU: - case TCG_COND_GEU: - case TCG_COND_LEU: - case TCG_COND_GTU: - cmp_map = mips_cmp_map[cond]; - if (cmp_map & MIPS_CMP_SWAP) { - TCGReg t = arg1; - arg1 = arg2; - arg2 = t; - } - tcg_out_opc_reg(s, s_opc, ret, arg1, arg2); - if (cmp_map & MIPS_CMP_INV) { - tcg_out_opc_imm(s, OPC_XORI, ret, ret, 1); - } - break; - - default: - g_assert_not_reached(); - break; - } + int tmpflags = tcg_out_setcond_int(s, cond, ret, arg1, arg2); + tcg_out_setcond_end(s, ret, tmpflags); } static void tcg_out_brcond(TCGContext *s, TCGCond cond, TCGReg arg1, @@ -948,9 +960,7 @@ static void tcg_out_brcond(TCGContext *s, TCGCond cond, TCGReg arg1, [TCG_COND_GE] = OPC_BGEZ, }; - MIPSInsn s_opc = OPC_SLTU; - MIPSInsn b_opc; - int cmp_map; + MIPSInsn b_opc = 0; switch (cond) { case TCG_COND_EQ: @@ -959,7 +969,6 @@ static void tcg_out_brcond(TCGContext *s, TCGCond cond, TCGReg arg1, case TCG_COND_NE: b_opc = OPC_BNE; break; - case TCG_COND_LT: case TCG_COND_GT: case TCG_COND_LE: @@ -968,133 +977,76 @@ static void tcg_out_brcond(TCGContext *s, TCGCond cond, TCGReg arg1, b_opc = b_zero[cond]; arg2 = arg1; arg1 = 0; - break; } - s_opc = OPC_SLT; - /* FALLTHRU */ - - case TCG_COND_LTU: - case TCG_COND_GTU: - case TCG_COND_LEU: - case TCG_COND_GEU: - cmp_map = mips_cmp_map[cond]; - if (cmp_map & MIPS_CMP_SWAP) { - TCGReg t = arg1; - arg1 = arg2; - arg2 = t; - } - tcg_out_opc_reg(s, s_opc, TCG_TMP0, arg1, arg2); - b_opc = (cmp_map & MIPS_CMP_INV ? OPC_BEQ : OPC_BNE); - arg1 = TCG_TMP0; - arg2 = TCG_REG_ZERO; break; - default: - g_assert_not_reached(); break; } + if (b_opc == 0) { + int tmpflags = tcg_out_setcond_int(s, cond, TCG_TMP0, arg1, arg2); + + arg2 = TCG_REG_ZERO; + arg1 = tmpflags & ~SETCOND_FLAGS; + b_opc = tmpflags & SETCOND_INV ? OPC_BEQ : OPC_BNE; + } + + tcg_out_reloc(s, s->code_ptr, R_MIPS_PC16, l, 0); tcg_out_opc_br(s, b_opc, arg1, arg2); - tcg_out_reloc(s, s->code_ptr - 1, R_MIPS_PC16, l, 0); tcg_out_nop(s); } -static TCGReg tcg_out_reduce_eq2(TCGContext *s, TCGReg tmp0, TCGReg tmp1, - TCGReg al, TCGReg ah, - TCGReg bl, TCGReg bh) +static int tcg_out_setcond2_int(TCGContext *s, TCGCond cond, TCGReg ret, + TCGReg al, TCGReg ah, TCGReg bl, TCGReg bh) { - /* Merge highpart comparison into AH. */ - if (bh != 0) { - if (ah != 0) { - tcg_out_opc_reg(s, OPC_XOR, tmp0, ah, bh); - ah = tmp0; - } else { - ah = bh; - } + int flags = 0; + + switch (cond) { + case TCG_COND_EQ: + flags |= SETCOND_INV; + /* fall through */ + case TCG_COND_NE: + flags |= SETCOND_NEZ; + tcg_out_opc_reg(s, OPC_XOR, TCG_TMP0, al, bl); + tcg_out_opc_reg(s, OPC_XOR, TCG_TMP1, ah, bh); + tcg_out_opc_reg(s, OPC_OR, ret, TCG_TMP0, TCG_TMP1); + break; + + default: + tcg_out_setcond(s, TCG_COND_EQ, TCG_TMP0, ah, bh); + tcg_out_setcond(s, tcg_unsigned_cond(cond), TCG_TMP1, al, bl); + tcg_out_opc_reg(s, OPC_AND, TCG_TMP1, TCG_TMP1, TCG_TMP0); + tcg_out_setcond(s, tcg_high_cond(cond), TCG_TMP0, ah, bh); + tcg_out_opc_reg(s, OPC_OR, ret, TCG_TMP0, TCG_TMP1); + break; } - /* Merge lowpart comparison into AL. */ - if (bl != 0) { - if (al != 0) { - tcg_out_opc_reg(s, OPC_XOR, tmp1, al, bl); - al = tmp1; - } else { - al = bl; - } - } - /* Merge high and low part comparisons into AL. */ - if (ah != 0) { - if (al != 0) { - tcg_out_opc_reg(s, OPC_OR, tmp0, ah, al); - al = tmp0; - } else { - al = ah; - } - } - return al; + return ret | flags; } static void tcg_out_setcond2(TCGContext *s, TCGCond cond, TCGReg ret, TCGReg al, TCGReg ah, TCGReg bl, TCGReg bh) { - TCGReg tmp0 = TCG_TMP0; - TCGReg tmp1 = ret; - - tcg_debug_assert(ret != TCG_TMP0); - if (ret == ah || ret == bh) { - tcg_debug_assert(ret != TCG_TMP1); - tmp1 = TCG_TMP1; - } - - switch (cond) { - case TCG_COND_EQ: - case TCG_COND_NE: - tmp1 = tcg_out_reduce_eq2(s, tmp0, tmp1, al, ah, bl, bh); - tcg_out_setcond(s, cond, ret, tmp1, TCG_REG_ZERO); - break; - - default: - tcg_out_setcond(s, TCG_COND_EQ, tmp0, ah, bh); - tcg_out_setcond(s, tcg_unsigned_cond(cond), tmp1, al, bl); - tcg_out_opc_reg(s, OPC_AND, tmp1, tmp1, tmp0); - tcg_out_setcond(s, tcg_high_cond(cond), tmp0, ah, bh); - tcg_out_opc_reg(s, OPC_OR, ret, tmp1, tmp0); - break; - } + int tmpflags = tcg_out_setcond2_int(s, cond, ret, al, ah, bl, bh); + tcg_out_setcond_end(s, ret, tmpflags); } static void tcg_out_brcond2(TCGContext *s, TCGCond cond, TCGReg al, TCGReg ah, TCGReg bl, TCGReg bh, TCGLabel *l) { - TCGCond b_cond = TCG_COND_NE; - TCGReg tmp = TCG_TMP1; + int tmpflags = tcg_out_setcond2_int(s, cond, TCG_TMP0, al, ah, bl, bh); + TCGReg tmp = tmpflags & ~SETCOND_FLAGS; + MIPSInsn b_opc = tmpflags & SETCOND_INV ? OPC_BEQ : OPC_BNE; - /* With branches, we emit between 4 and 9 insns with 2 or 3 branches. - With setcond, we emit between 3 and 10 insns and only 1 branch, - which ought to get better branch prediction. */ - switch (cond) { - case TCG_COND_EQ: - case TCG_COND_NE: - b_cond = cond; - tmp = tcg_out_reduce_eq2(s, TCG_TMP0, TCG_TMP1, al, ah, bl, bh); - break; - - default: - /* Minimize code size by preferring a compare not requiring INV. */ - if (mips_cmp_map[cond] & MIPS_CMP_INV) { - cond = tcg_invert_cond(cond); - b_cond = TCG_COND_EQ; - } - tcg_out_setcond2(s, cond, tmp, al, ah, bl, bh); - break; - } - - tcg_out_brcond(s, b_cond, tmp, TCG_REG_ZERO, l); + tcg_out_reloc(s, s->code_ptr, R_MIPS_PC16, l, 0); + tcg_out_opc_br(s, b_opc, tmp, TCG_REG_ZERO); + tcg_out_nop(s); } static void tcg_out_movcond(TCGContext *s, TCGCond cond, TCGReg ret, TCGReg c1, TCGReg c2, TCGReg v1, TCGReg v2) { - bool eqz = false; + int tmpflags; + bool eqz; /* If one of the values is zero, put it last to match SEL*Z instructions */ if (use_mips32r6_instructions && v1 == 0) { @@ -1103,27 +1055,9 @@ static void tcg_out_movcond(TCGContext *s, TCGCond cond, TCGReg ret, cond = tcg_invert_cond(cond); } - switch (cond) { - case TCG_COND_EQ: - eqz = true; - /* FALLTHRU */ - case TCG_COND_NE: - if (c2 != 0) { - tcg_out_opc_reg(s, OPC_XOR, TCG_TMP0, c1, c2); - c1 = TCG_TMP0; - } - break; - - default: - /* Minimize code size by preferring a compare not requiring INV. */ - if (mips_cmp_map[cond] & MIPS_CMP_INV) { - cond = tcg_invert_cond(cond); - eqz = true; - } - tcg_out_setcond(s, cond, TCG_TMP0, c1, c2); - c1 = TCG_TMP0; - break; - } + tmpflags = tcg_out_setcond_int(s, cond, TCG_TMP0, c1, c2); + c1 = tmpflags & ~SETCOND_FLAGS; + eqz = tmpflags & SETCOND_INV; if (use_mips32r6_instructions) { MIPSInsn m_opc_t = eqz ? OPC_SELEQZ : OPC_SELNEZ;