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[174.21.72.39]) by smtp.gmail.com with ESMTPSA id b12sm13942084pff.63.2021.08.29.23.24.59 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 29 Aug 2021 23:24:59 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 10/48] tcg/optimize: Change fail return for do_constant_folding_cond* Date: Sun, 29 Aug 2021 23:24:13 -0700 Message-Id: <20210830062451.639572-11-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210830062451.639572-1-richard.henderson@linaro.org> References: <20210830062451.639572-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::436; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x436.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+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Return -1 instead of 2 for failure. This us to use comparisons against 0 for all cases. Signed-off-by: Richard Henderson --- tcg/optimize.c | 145 +++++++++++++++++++++++++------------------------ 1 file changed, 74 insertions(+), 71 deletions(-) diff --git a/tcg/optimize.c b/tcg/optimize.c index 96012a6da8..39a65d305f 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -502,10 +502,12 @@ static bool do_constant_folding_cond_eq(TCGCond c) } } -/* Return 2 if the condition can't be simplified, and the result - of the condition (0 or 1) if it can */ -static TCGArg do_constant_folding_cond(TCGOpcode op, TCGArg x, - TCGArg y, TCGCond c) +/* + * Return -1 if the condition can't be simplified, + * and the result of the condition (0 or 1) if it can. + */ +static int do_constant_folding_cond(TCGOpcode op, TCGArg x, + TCGArg y, TCGCond c) { uint64_t xv = arg_info(x)->val; uint64_t yv = arg_info(y)->val; @@ -527,15 +529,17 @@ static TCGArg do_constant_folding_cond(TCGOpcode op, TCGArg x, case TCG_COND_GEU: return 1; default: - return 2; + return -1; } } - return 2; + return -1; } -/* Return 2 if the condition can't be simplified, and the result - of the condition (0 or 1) if it can */ -static TCGArg do_constant_folding_cond2(TCGArg *p1, TCGArg *p2, TCGCond c) +/* + * Return -1 if the condition can't be simplified, + * and the result of the condition (0 or 1) if it can. + */ +static int do_constant_folding_cond2(TCGArg *p1, TCGArg *p2, TCGCond c) { TCGArg al = p1[0], ah = p1[1]; TCGArg bl = p2[0], bh = p2[1]; @@ -565,7 +569,7 @@ static TCGArg do_constant_folding_cond2(TCGArg *p1, TCGArg *p2, TCGCond c) if (args_are_copies(al, bl) && args_are_copies(ah, bh)) { return do_constant_folding_cond_eq(c); } - return 2; + return -1; } static bool swap_commutative(TCGArg dest, TCGArg *p1, TCGArg *p2) @@ -1321,22 +1325,21 @@ void tcg_optimize(TCGContext *s) break; CASE_OP_32_64(setcond): - tmp = do_constant_folding_cond(opc, op->args[1], - op->args[2], op->args[3]); - if (tmp != 2) { - tcg_opt_gen_movi(&ctx, op, op->args[0], tmp); + i = do_constant_folding_cond(opc, op->args[1], + op->args[2], op->args[3]); + if (i >= 0) { + tcg_opt_gen_movi(&ctx, op, op->args[0], i); continue; } break; CASE_OP_32_64(brcond): - tmp = do_constant_folding_cond(opc, op->args[0], - op->args[1], op->args[2]); - switch (tmp) { - case 0: + i = do_constant_folding_cond(opc, op->args[0], + op->args[1], op->args[2]); + if (i == 0) { tcg_op_remove(s, op); continue; - case 1: + } else if (i > 0) { memset(&ctx.temps_used, 0, sizeof(ctx.temps_used)); op->opc = opc = INDEX_op_br; op->args[0] = op->args[3]; @@ -1345,10 +1348,10 @@ void tcg_optimize(TCGContext *s) break; CASE_OP_32_64(movcond): - tmp = do_constant_folding_cond(opc, op->args[1], - op->args[2], op->args[5]); - if (tmp != 2) { - tcg_opt_gen_mov(&ctx, op, op->args[0], op->args[4-tmp]); + i = do_constant_folding_cond(opc, op->args[1], + op->args[2], op->args[5]); + if (i >= 0) { + tcg_opt_gen_mov(&ctx, op, op->args[0], op->args[4 - i]); continue; } if (arg_is_const(op->args[3]) && arg_is_const(op->args[4])) { @@ -1412,14 +1415,14 @@ void tcg_optimize(TCGContext *s) break; case INDEX_op_brcond2_i32: - tmp = do_constant_folding_cond2(&op->args[0], &op->args[2], - op->args[4]); - if (tmp == 0) { + i = do_constant_folding_cond2(&op->args[0], &op->args[2], + op->args[4]); + if (i == 0) { do_brcond_false: tcg_op_remove(s, op); continue; } - if (tmp == 1) { + if (i > 0) { do_brcond_true: op->opc = opc = INDEX_op_br; op->args[0] = op->args[5]; @@ -1443,20 +1446,20 @@ void tcg_optimize(TCGContext *s) if (op->args[4] == TCG_COND_EQ) { /* Simplify EQ comparisons where one of the pairs can be simplified. */ - tmp = do_constant_folding_cond(INDEX_op_brcond_i32, - op->args[0], op->args[2], - TCG_COND_EQ); - if (tmp == 0) { + i = do_constant_folding_cond(INDEX_op_brcond_i32, + op->args[0], op->args[2], + TCG_COND_EQ); + if (i == 0) { goto do_brcond_false; - } else if (tmp == 1) { + } else if (i > 0) { goto do_brcond_high; } - tmp = do_constant_folding_cond(INDEX_op_brcond_i32, - op->args[1], op->args[3], - TCG_COND_EQ); - if (tmp == 0) { + i = do_constant_folding_cond(INDEX_op_brcond_i32, + op->args[1], op->args[3], + TCG_COND_EQ); + if (i == 0) { goto do_brcond_false; - } else if (tmp != 1) { + } else if (i < 0) { break; } do_brcond_low: @@ -1470,31 +1473,31 @@ void tcg_optimize(TCGContext *s) if (op->args[4] == TCG_COND_NE) { /* Simplify NE comparisons where one of the pairs can be simplified. */ - tmp = do_constant_folding_cond(INDEX_op_brcond_i32, - op->args[0], op->args[2], - TCG_COND_NE); - if (tmp == 0) { + i = do_constant_folding_cond(INDEX_op_brcond_i32, + op->args[0], op->args[2], + TCG_COND_NE); + if (i == 0) { goto do_brcond_high; - } else if (tmp == 1) { + } else if (i > 0) { goto do_brcond_true; } - tmp = do_constant_folding_cond(INDEX_op_brcond_i32, - op->args[1], op->args[3], - TCG_COND_NE); - if (tmp == 0) { + i = do_constant_folding_cond(INDEX_op_brcond_i32, + op->args[1], op->args[3], + TCG_COND_NE); + if (i == 0) { goto do_brcond_low; - } else if (tmp == 1) { + } else if (i > 0) { goto do_brcond_true; } } break; case INDEX_op_setcond2_i32: - tmp = do_constant_folding_cond2(&op->args[1], &op->args[3], - op->args[5]); - if (tmp != 2) { + i = do_constant_folding_cond2(&op->args[1], &op->args[3], + op->args[5]); + if (i >= 0) { do_setcond_const: - tcg_opt_gen_movi(&ctx, op, op->args[0], tmp); + tcg_opt_gen_movi(&ctx, op, op->args[0], i); continue; } if ((op->args[5] == TCG_COND_LT || op->args[5] == TCG_COND_GE) @@ -1516,20 +1519,20 @@ void tcg_optimize(TCGContext *s) if (op->args[5] == TCG_COND_EQ) { /* Simplify EQ comparisons where one of the pairs can be simplified. */ - tmp = do_constant_folding_cond(INDEX_op_setcond_i32, - op->args[1], op->args[3], - TCG_COND_EQ); - if (tmp == 0) { + i = do_constant_folding_cond(INDEX_op_setcond_i32, + op->args[1], op->args[3], + TCG_COND_EQ); + if (i == 0) { goto do_setcond_const; - } else if (tmp == 1) { + } else if (i > 0) { goto do_setcond_high; } - tmp = do_constant_folding_cond(INDEX_op_setcond_i32, - op->args[2], op->args[4], - TCG_COND_EQ); - if (tmp == 0) { + i = do_constant_folding_cond(INDEX_op_setcond_i32, + op->args[2], op->args[4], + TCG_COND_EQ); + if (i == 0) { goto do_setcond_high; - } else if (tmp != 1) { + } else if (i < 0) { break; } do_setcond_low: @@ -1543,20 +1546,20 @@ void tcg_optimize(TCGContext *s) if (op->args[5] == TCG_COND_NE) { /* Simplify NE comparisons where one of the pairs can be simplified. */ - tmp = do_constant_folding_cond(INDEX_op_setcond_i32, - op->args[1], op->args[3], - TCG_COND_NE); - if (tmp == 0) { + i = do_constant_folding_cond(INDEX_op_setcond_i32, + op->args[1], op->args[3], + TCG_COND_NE); + if (i == 0) { goto do_setcond_high; - } else if (tmp == 1) { + } else if (i > 0) { goto do_setcond_const; } - tmp = do_constant_folding_cond(INDEX_op_setcond_i32, - op->args[2], op->args[4], - TCG_COND_NE); - if (tmp == 0) { + i = do_constant_folding_cond(INDEX_op_setcond_i32, + op->args[2], op->args[4], + TCG_COND_NE); + if (i == 0) { goto do_setcond_low; - } else if (tmp == 1) { + } else if (i > 0) { goto do_setcond_const; } }