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[187.189.51.144]) by smtp.gmail.com with ESMTPSA id h93sm1495135otb.29.2020.12.10.17.14.56 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Dec 2020 17:14:56 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 1/2] tcg/i386: Adjust TCG_TARGET_HAS_MEMORY_BSWAP Date: Thu, 10 Dec 2020 19:14:52 -0600 Message-Id: <20201211011453.475155-2-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201211011453.475155-1-richard.henderson@linaro.org> References: <20201211011453.475155-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::341; envelope-from=richard.henderson@linaro.org; helo=mail-ot1-x341.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: 2.1.23 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" Always true when movbe is available, otherwise leave this to generic code. Signed-off-by: Richard Henderson --- tcg/i386/tcg-target.h | 3 +- tcg/i386/tcg-target.c.inc | 119 ++++++++++++++------------------------ 2 files changed, 47 insertions(+), 75 deletions(-) diff --git a/tcg/i386/tcg-target.h b/tcg/i386/tcg-target.h index abd4ac7fc0..89700ab6af 100644 --- a/tcg/i386/tcg-target.h +++ b/tcg/i386/tcg-target.h @@ -101,6 +101,7 @@ extern bool have_bmi1; extern bool have_popcnt; extern bool have_avx1; extern bool have_avx2; +extern bool have_movbe; /* optional instructions */ #define TCG_TARGET_HAS_div2_i32 1 @@ -229,7 +230,7 @@ static inline void tb_target_set_jmp_target(uintptr_t tc_ptr, #define TCG_TARGET_DEFAULT_MO (TCG_MO_ALL & ~TCG_MO_ST_LD) -#define TCG_TARGET_HAS_MEMORY_BSWAP 1 +#define TCG_TARGET_HAS_MEMORY_BSWAP have_movbe #ifdef CONFIG_SOFTMMU #define TCG_TARGET_NEED_LDST_LABELS diff --git a/tcg/i386/tcg-target.c.inc b/tcg/i386/tcg-target.c.inc index d8797ed398..01588cdcb4 100644 --- a/tcg/i386/tcg-target.c.inc +++ b/tcg/i386/tcg-target.c.inc @@ -154,13 +154,12 @@ bool have_bmi1; bool have_popcnt; bool have_avx1; bool have_avx2; +bool have_movbe; #ifdef CONFIG_CPUID_H -static bool have_movbe; static bool have_bmi2; static bool have_lzcnt; #else -# define have_movbe 0 # define have_bmi2 0 # define have_lzcnt 0 #endif @@ -1986,13 +1985,14 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg datalo, TCGReg datahi, TCGReg base, int index, intptr_t ofs, int seg, bool is64, MemOp memop) { - const MemOp real_bswap = memop & MO_BSWAP; - MemOp bswap = real_bswap; + bool use_movbe = false; int rexw = is64 * P_REXW; int movop = OPC_MOVL_GvEv; - if (have_movbe && real_bswap) { - bswap = 0; + /* Do big-endian loads with movbe. */ + if (memop & MO_BSWAP) { + tcg_debug_assert(have_movbe); + use_movbe = true; movop = OPC_MOVBE_GyMy; } @@ -2006,23 +2006,28 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg datalo, TCGReg datahi, base, index, 0, ofs); break; case MO_UW: - tcg_out_modrm_sib_offset(s, OPC_MOVZWL + seg, datalo, - base, index, 0, ofs); - if (real_bswap) { - tcg_out_rolw_8(s, datalo); - } - break; - case MO_SW: - if (real_bswap) { - if (have_movbe) { + if (use_movbe) { + /* There is no extending movbe; only low 16-bits are modified. */ + if (datalo != base && datalo != index) { + /* XOR breaks dependency chains. */ + tgen_arithr(s, ARITH_XOR, datalo, datalo); tcg_out_modrm_sib_offset(s, OPC_MOVBE_GyMy + P_DATA16 + seg, datalo, base, index, 0, ofs); } else { - tcg_out_modrm_sib_offset(s, OPC_MOVZWL + seg, datalo, - base, index, 0, ofs); - tcg_out_rolw_8(s, datalo); + tcg_out_modrm_sib_offset(s, OPC_MOVBE_GyMy + P_DATA16 + seg, + datalo, base, index, 0, ofs); + tcg_out_ext16u(s, datalo, datalo); } - tcg_out_modrm(s, OPC_MOVSWL + rexw, datalo, datalo); + } else { + tcg_out_modrm_sib_offset(s, OPC_MOVZWL + seg, datalo, + base, index, 0, ofs); + } + break; + case MO_SW: + if (use_movbe) { + tcg_out_modrm_sib_offset(s, OPC_MOVBE_GyMy + P_DATA16 + seg, + datalo, base, index, 0, ofs); + tcg_out_ext16s(s, datalo, datalo, rexw); } else { tcg_out_modrm_sib_offset(s, OPC_MOVSWL + rexw + seg, datalo, base, index, 0, ofs); @@ -2030,18 +2035,12 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg datalo, TCGReg datahi, break; case MO_UL: tcg_out_modrm_sib_offset(s, movop + seg, datalo, base, index, 0, ofs); - if (bswap) { - tcg_out_bswap32(s, datalo); - } break; #if TCG_TARGET_REG_BITS == 64 case MO_SL: - if (real_bswap) { - tcg_out_modrm_sib_offset(s, movop + seg, datalo, + if (use_movbe) { + tcg_out_modrm_sib_offset(s, OPC_MOVBE_GyMy + seg, datalo, base, index, 0, ofs); - if (bswap) { - tcg_out_bswap32(s, datalo); - } tcg_out_ext32s(s, datalo, datalo); } else { tcg_out_modrm_sib_offset(s, OPC_MOVSLQ + seg, datalo, @@ -2053,12 +2052,9 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg datalo, TCGReg datahi, if (TCG_TARGET_REG_BITS == 64) { tcg_out_modrm_sib_offset(s, movop + P_REXW + seg, datalo, base, index, 0, ofs); - if (bswap) { - tcg_out_bswap64(s, datalo); - } } else { - if (real_bswap) { - int t = datalo; + if (use_movbe) { + TCGReg t = datalo; datalo = datahi; datahi = t; } @@ -2073,14 +2069,10 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg datalo, TCGReg datahi, tcg_out_modrm_sib_offset(s, movop + seg, datalo, base, index, 0, ofs); } - if (bswap) { - tcg_out_bswap32(s, datalo); - tcg_out_bswap32(s, datahi); - } } break; default: - tcg_abort(); + g_assert_not_reached(); } } @@ -2128,24 +2120,27 @@ static void tcg_out_qemu_st_direct(TCGContext *s, TCGReg datalo, TCGReg datahi, TCGReg base, int index, intptr_t ofs, int seg, MemOp memop) { - /* ??? Ideally we wouldn't need a scratch register. For user-only, - we could perform the bswap twice to restore the original value - instead of moving to the scratch. But as it is, the L constraint - means that TCG_REG_L0 is definitely free here. */ const TCGReg scratch = TCG_REG_L0; - const MemOp real_bswap = memop & MO_BSWAP; - MemOp bswap = real_bswap; + bool use_movbe = false; int movop = OPC_MOVL_EvGv; - if (have_movbe && real_bswap) { - bswap = 0; + /* + * Do big-endian stores with movbe or softmmu. + * User-only without movbe will have its swapping done generically. + */ + if (memop & MO_BSWAP) { + tcg_debug_assert(have_movbe); + use_movbe = true; movop = OPC_MOVBE_MyGy; } switch (memop & MO_SIZE) { case MO_8: - /* In 32-bit mode, 8-bit stores can only happen from [abcd]x. - Use the scratch register if necessary. */ + /* + * In 32-bit mode, 8-bit stores can only happen from [abcd]x. + * TODO: Adjust constraints such that this is is forced, + * then we won't need a scratch at all for user-only. + */ if (TCG_TARGET_REG_BITS == 32 && datalo >= 4) { tcg_out_mov(s, TCG_TYPE_I32, scratch, datalo); datalo = scratch; @@ -2154,43 +2149,19 @@ static void tcg_out_qemu_st_direct(TCGContext *s, TCGReg datalo, TCGReg datahi, datalo, base, index, 0, ofs); break; case MO_16: - if (bswap) { - tcg_out_mov(s, TCG_TYPE_I32, scratch, datalo); - tcg_out_rolw_8(s, scratch); - datalo = scratch; - } tcg_out_modrm_sib_offset(s, movop + P_DATA16 + seg, datalo, base, index, 0, ofs); break; case MO_32: - if (bswap) { - tcg_out_mov(s, TCG_TYPE_I32, scratch, datalo); - tcg_out_bswap32(s, scratch); - datalo = scratch; - } tcg_out_modrm_sib_offset(s, movop + seg, datalo, base, index, 0, ofs); break; case MO_64: if (TCG_TARGET_REG_BITS == 64) { - if (bswap) { - tcg_out_mov(s, TCG_TYPE_I64, scratch, datalo); - tcg_out_bswap64(s, scratch); - datalo = scratch; - } tcg_out_modrm_sib_offset(s, movop + P_REXW + seg, datalo, base, index, 0, ofs); - } else if (bswap) { - tcg_out_mov(s, TCG_TYPE_I32, scratch, datahi); - tcg_out_bswap32(s, scratch); - tcg_out_modrm_sib_offset(s, OPC_MOVL_EvGv + seg, scratch, - base, index, 0, ofs); - tcg_out_mov(s, TCG_TYPE_I32, scratch, datalo); - tcg_out_bswap32(s, scratch); - tcg_out_modrm_sib_offset(s, OPC_MOVL_EvGv + seg, scratch, - base, index, 0, ofs + 4); } else { - if (real_bswap) { - int t = datalo; + if (use_movbe) { + TCGReg t = datalo; datalo = datahi; datahi = t; } @@ -2201,7 +2172,7 @@ static void tcg_out_qemu_st_direct(TCGContext *s, TCGReg datalo, TCGReg datahi, } break; default: - tcg_abort(); + g_assert_not_reached(); } } -- 2.25.1