From patchwork Tue Sep 25 22:52:01 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aurelien Jarno X-Patchwork-Id: 186914 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id EF6A82C0085 for ; Wed, 26 Sep 2012 08:52:31 +1000 (EST) Received: from localhost ([::1]:54108 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TGdzS-00018n-1S for incoming@patchwork.ozlabs.org; Tue, 25 Sep 2012 18:52:30 -0400 Received: from eggs.gnu.org ([208.118.235.92]:45778) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TGdz9-0000z6-5I for qemu-devel@nongnu.org; Tue, 25 Sep 2012 18:52:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TGdz6-00064m-FW for qemu-devel@nongnu.org; Tue, 25 Sep 2012 18:52:11 -0400 Received: from hall.aurel32.net ([88.191.126.93]:41861) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TGdz6-000641-2N for qemu-devel@nongnu.org; Tue, 25 Sep 2012 18:52:08 -0400 Received: from [2001:470:d4ed:0:ea11:32ff:fea1:831a] (helo=ohm.aurel32.net) by hall.aurel32.net with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.72) (envelope-from ) id 1TGdz4-0007mq-1G; Wed, 26 Sep 2012 00:52:06 +0200 Received: from aurel32 by ohm.aurel32.net with local (Exim 4.80) (envelope-from ) id 1TGdz2-0003eN-Kd; Wed, 26 Sep 2012 00:52:04 +0200 From: Aurelien Jarno To: qemu-devel@nongnu.org Date: Wed, 26 Sep 2012 00:52:01 +0200 Message-Id: <1348613523-13892-4-git-send-email-aurelien@aurel32.net> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1348613523-13892-1-git-send-email-aurelien@aurel32.net> References: <1348613523-13892-1-git-send-email-aurelien@aurel32.net> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-Received-From: 88.191.126.93 Cc: Peter Maydell , Aurelien Jarno Subject: [Qemu-devel] [PATCH v3 3/5] target-arm: convert sar, shl and shr helpers to TCG X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Now that the movcond TCG op is available, it's possible to replace shl and shr helpers by TCG code. The code generated by TCG is slightly longer than the code generated by GCC for the helper but is still worth it as this avoid all the consequences of using an helper: globals saved back to memory, no possible optimization, call overhead, etc. Cc: Peter Maydell Signed-off-by: Aurelien Jarno Reviewed-by: Peter Maydell --- target-arm/helper.h | 3 --- target-arm/op_helper.c | 24 ------------------------ target-arm/translate.c | 49 ++++++++++++++++++++++++++++++++++++++++++------ 3 files changed, 43 insertions(+), 33 deletions(-) diff --git a/target-arm/helper.h b/target-arm/helper.h index 7151e28..794e2b1 100644 --- a/target-arm/helper.h +++ b/target-arm/helper.h @@ -145,9 +145,6 @@ DEF_HELPER_5(neon_tbl, i32, env, i32, i32, i32, i32) DEF_HELPER_3(adc_cc, i32, env, i32, i32) DEF_HELPER_3(sbc_cc, i32, env, i32, i32) -DEF_HELPER_3(shl, i32, env, i32, i32) -DEF_HELPER_3(shr, i32, env, i32, i32) -DEF_HELPER_3(sar, i32, env, i32, i32) DEF_HELPER_3(shl_cc, i32, env, i32, i32) DEF_HELPER_3(shr_cc, i32, env, i32, i32) DEF_HELPER_3(sar_cc, i32, env, i32, i32) diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c index 6095f24..aef592a 100644 --- a/target-arm/op_helper.c +++ b/target-arm/op_helper.c @@ -355,30 +355,6 @@ uint32_t HELPER(sbc_cc)(CPUARMState *env, uint32_t a, uint32_t b) /* Similarly for variable shift instructions. */ -uint32_t HELPER(shl)(CPUARMState *env, uint32_t x, uint32_t i) -{ - int shift = i & 0xff; - if (shift >= 32) - return 0; - return x << shift; -} - -uint32_t HELPER(shr)(CPUARMState *env, uint32_t x, uint32_t i) -{ - int shift = i & 0xff; - if (shift >= 32) - return 0; - return (uint32_t)x >> shift; -} - -uint32_t HELPER(sar)(CPUARMState *env, uint32_t x, uint32_t i) -{ - int shift = i & 0xff; - if (shift >= 32) - shift = 31; - return (int32_t)x >> shift; -} - uint32_t HELPER(shl_cc)(CPUARMState *env, uint32_t x, uint32_t i) { int shift = i & 0xff; diff --git a/target-arm/translate.c b/target-arm/translate.c index 19bb1e8..953a80e 100644 --- a/target-arm/translate.c +++ b/target-arm/translate.c @@ -440,6 +440,37 @@ static void gen_sub_CC(TCGv dest, TCGv t0, TCGv t1) tcg_gen_mov_i32(dest, cpu_NF); } +#define GEN_SHIFT(name) \ +static void gen_##name(TCGv dest, TCGv t0, TCGv t1) \ +{ \ + TCGv tmp1, tmp2, tmp3; \ + tmp1 = tcg_temp_new_i32(); \ + tcg_gen_andi_i32(tmp1, t1, 0xff); \ + tmp2 = tcg_const_i32(0); \ + tmp3 = tcg_const_i32(0x1f); \ + tcg_gen_movcond_i32(TCG_COND_GTU, tmp2, tmp1, tmp3, tmp2, t0); \ + tcg_temp_free_i32(tmp3); \ + tcg_gen_andi_i32(tmp1, tmp1, 0x1f); \ + tcg_gen_##name##_i32(dest, tmp2, tmp1); \ + tcg_temp_free_i32(tmp2); \ + tcg_temp_free_i32(tmp1); \ +} +GEN_SHIFT(shl) +GEN_SHIFT(shr) +#undef GEN_SHIFT + +static void gen_sar(TCGv dest, TCGv t0, TCGv t1) +{ + TCGv tmp1, tmp2; + tmp1 = tcg_temp_new_i32(); + tcg_gen_andi_i32(tmp1, t1, 0xff); + tmp2 = tcg_const_i32(0x1f); + tcg_gen_movcond_i32(TCG_COND_GTU, tmp1, tmp1, tmp2, tmp2, tmp1); + tcg_temp_free_i32(tmp2); + tcg_gen_sar_i32(dest, t0, tmp1); + tcg_temp_free_i32(tmp1); +} + /* FIXME: Implement this natively. */ #define tcg_gen_abs_i32(t0, t1) gen_helper_abs(t0, t1) @@ -516,9 +547,15 @@ static inline void gen_arm_shift_reg(TCGv var, int shiftop, } } else { switch (shiftop) { - case 0: gen_helper_shl(var, cpu_env, var, shift); break; - case 1: gen_helper_shr(var, cpu_env, var, shift); break; - case 2: gen_helper_sar(var, cpu_env, var, shift); break; + case 0: + gen_shl(var, var, shift); + break; + case 1: + gen_shr(var, var, shift); + break; + case 2: + gen_sar(var, var, shift); + break; case 3: tcg_gen_andi_i32(shift, shift, 0x1f); tcg_gen_rotr_i32(var, var, shift); break; } @@ -9161,7 +9198,7 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s) break; case 0x2: /* lsl */ if (s->condexec_mask) { - gen_helper_shl(tmp2, cpu_env, tmp2, tmp); + gen_shl(tmp2, tmp2, tmp); } else { gen_helper_shl_cc(tmp2, cpu_env, tmp2, tmp); gen_logic_CC(tmp2); @@ -9169,7 +9206,7 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s) break; case 0x3: /* lsr */ if (s->condexec_mask) { - gen_helper_shr(tmp2, cpu_env, tmp2, tmp); + gen_shr(tmp2, tmp2, tmp); } else { gen_helper_shr_cc(tmp2, cpu_env, tmp2, tmp); gen_logic_CC(tmp2); @@ -9177,7 +9214,7 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s) break; case 0x4: /* asr */ if (s->condexec_mask) { - gen_helper_sar(tmp2, cpu_env, tmp2, tmp); + gen_sar(tmp2, tmp2, tmp); } else { gen_helper_sar_cc(tmp2, cpu_env, tmp2, tmp); gen_logic_CC(tmp2);