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From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: luis.pires@eldorado.org.br, alex.bennee@linaro.org
Subject: [PATCH v3 10/48] tcg/optimize: Change fail return for do_constant_folding_cond*
Date: Thu, 21 Oct 2021 14:05:01 -0700	[thread overview]
Message-ID: <20211021210539.825582-11-richard.henderson@linaro.org> (raw)
In-Reply-To: <20211021210539.825582-1-richard.henderson@linaro.org>

Return -1 instead of 2 for failure.
This us to use comparisons against 0 for all cases.

Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/optimize.c | 145 +++++++++++++++++++++++++------------------------
 1 file changed, 74 insertions(+), 71 deletions(-)

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 77cdffaaef..19c01687b4 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;
                 }
             }
-- 
2.25.1



  parent reply	other threads:[~2021-10-21 21:28 UTC|newest]

Thread overview: 108+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-21 21:04 [PATCH v3 00/48] tcg: optimize redundant sign extensions Richard Henderson
2021-10-21 21:04 ` [PATCH v3 01/48] tcg/optimize: Rename "mask" to "z_mask" Richard Henderson
2021-10-21 21:04 ` [PATCH v3 02/48] tcg/optimize: Split out OptContext Richard Henderson
2021-10-22 14:53   ` Philippe Mathieu-Daudé
2021-10-21 21:04 ` [PATCH v3 03/48] tcg/optimize: Remove do_default label Richard Henderson
2021-10-22 15:12   ` Philippe Mathieu-Daudé
2021-10-21 21:04 ` [PATCH v3 04/48] tcg/optimize: Change tcg_opt_gen_{mov, movi} interface Richard Henderson
2021-10-21 21:04 ` [PATCH v3 05/48] tcg/optimize: Move prev_mb into OptContext Richard Henderson
2021-10-22 15:13   ` Philippe Mathieu-Daudé
2021-10-21 21:04 ` [PATCH v3 06/48] tcg/optimize: Split out init_arguments Richard Henderson
2021-10-21 21:04 ` [PATCH v3 07/48] tcg/optimize: Split out copy_propagate Richard Henderson
2021-10-21 21:04 ` [PATCH v3 08/48] tcg/optimize: Split out fold_call Richard Henderson
2021-10-21 21:05 ` [PATCH v3 09/48] tcg/optimize: Drop nb_oargs, nb_iargs locals Richard Henderson
2021-10-21 21:05 ` Richard Henderson [this message]
2021-10-22 13:53   ` [PATCH v3 10/48] tcg/optimize: Change fail return for do_constant_folding_cond* Philippe Mathieu-Daudé
2021-10-21 21:05 ` [PATCH v3 11/48] tcg/optimize: Return true from tcg_opt_gen_{mov, movi} Richard Henderson
2021-10-26 15:13   ` [PATCH v3 11/48] tcg/optimize: Return true from tcg_opt_gen_{mov,movi} Alex Bennée
2021-10-21 21:05 ` [PATCH v3 12/48] tcg/optimize: Split out finish_folding Richard Henderson
2021-10-26 15:16   ` Alex Bennée
2021-10-21 21:05 ` [PATCH v3 13/48] tcg/optimize: Use a boolean to avoid a mass of continues Richard Henderson
2021-10-26 15:17   ` Alex Bennée
2021-10-21 21:05 ` [PATCH v3 14/48] tcg/optimize: Split out fold_mb, fold_qemu_{ld,st} Richard Henderson
2021-10-22 13:56   ` Philippe Mathieu-Daudé
2021-10-21 21:05 ` [PATCH v3 15/48] tcg/optimize: Split out fold_const{1,2} Richard Henderson
2021-10-26 15:19   ` Alex Bennée
2021-10-21 21:05 ` [PATCH v3 16/48] tcg/optimize: Split out fold_setcond2 Richard Henderson
2021-10-26 15:31   ` Alex Bennée
2021-10-21 21:05 ` [PATCH v3 17/48] tcg/optimize: Split out fold_brcond2 Richard Henderson
2021-10-22 17:26   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 18/48] tcg/optimize: Split out fold_brcond Richard Henderson
2021-10-22 13:58   ` Philippe Mathieu-Daudé
2021-10-21 21:05 ` [PATCH v3 19/48] tcg/optimize: Split out fold_setcond Richard Henderson
2021-10-22 13:59   ` Philippe Mathieu-Daudé
2021-10-21 21:05 ` [PATCH v3 20/48] tcg/optimize: Split out fold_mulu2_i32 Richard Henderson
2021-10-22 14:00   ` Philippe Mathieu-Daudé
2021-10-22 17:32   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 21/48] tcg/optimize: Split out fold_addsub2_i32 Richard Henderson
2021-10-22 14:01   ` Philippe Mathieu-Daudé
2021-10-22 17:33   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 22/48] tcg/optimize: Split out fold_movcond Richard Henderson
2021-10-22 14:05   ` Philippe Mathieu-Daudé
2021-10-22 17:34   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 23/48] tcg/optimize: Split out fold_extract2 Richard Henderson
2021-10-22 14:07   ` Philippe Mathieu-Daudé
2021-10-22 17:34   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 24/48] tcg/optimize: Split out fold_extract, fold_sextract Richard Henderson
2021-10-22 14:08   ` Philippe Mathieu-Daudé
2021-10-22 17:34   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 25/48] tcg/optimize: Split out fold_deposit Richard Henderson
2021-10-22 14:09   ` Philippe Mathieu-Daudé
2021-10-22 17:35   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 26/48] tcg/optimize: Split out fold_count_zeros Richard Henderson
2021-10-22 14:10   ` Philippe Mathieu-Daudé
2021-10-22 17:35   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 27/48] tcg/optimize: Split out fold_bswap Richard Henderson
2021-10-22 17:36   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 28/48] tcg/optimize: Split out fold_dup, fold_dup2 Richard Henderson
2021-10-22 14:12   ` Philippe Mathieu-Daudé
2021-10-22 17:36   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 29/48] tcg/optimize: Split out fold_mov Richard Henderson
2021-10-22 17:39   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 30/48] tcg/optimize: Split out fold_xx_to_i Richard Henderson
2021-10-22 21:04   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 31/48] tcg/optimize: Split out fold_xx_to_x Richard Henderson
2021-10-22 21:04   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 32/48] tcg/optimize: Split out fold_xi_to_i Richard Henderson
2021-10-22 21:17   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 33/48] tcg/optimize: Add type to OptContext Richard Henderson
2021-10-22 22:11   ` Luis Fernando Fujita Pires
2021-10-23 18:25     ` Richard Henderson
2021-10-21 21:05 ` [PATCH v3 34/48] tcg/optimize: Split out fold_to_not Richard Henderson
2021-10-25 14:17   ` Luis Fernando Fujita Pires
2021-10-25 17:31     ` Richard Henderson
2021-10-25 18:13       ` Luis Fernando Fujita Pires
2021-10-25 18:35         ` Richard Henderson
2021-10-21 21:05 ` [PATCH v3 35/48] tcg/optimize: Split out fold_sub_to_neg Richard Henderson
2021-10-25 14:17   ` Luis Fernando Fujita Pires
2021-10-21 21:05 ` [PATCH v3 36/48] tcg/optimize: Split out fold_xi_to_x Richard Henderson
2021-10-25 14:26   ` Luis Fernando Fujita Pires
2021-10-25 17:46     ` Richard Henderson
2021-10-21 21:05 ` [PATCH v3 37/48] tcg/optimize: Split out fold_ix_to_i Richard Henderson
2021-10-25 14:26   ` Luis Fernando Fujita Pires
2021-10-26 19:11   ` Philippe Mathieu-Daudé
2021-10-21 21:05 ` [PATCH v3 38/48] tcg/optimize: Split out fold_masks Richard Henderson
2021-10-26 15:32   ` Alex Bennée
2021-10-26 18:50     ` Richard Henderson
2021-10-21 21:05 ` [PATCH v3 39/48] tcg/optimize: Expand fold_mulu2_i32 to all 4-arg multiplies Richard Henderson
2021-10-22 14:16   ` Philippe Mathieu-Daudé
2021-10-21 21:05 ` [PATCH v3 40/48] tcg/optimize: Expand fold_addsub2_i32 to 64-bit ops Richard Henderson
2021-10-26 16:21   ` Alex Bennée
2021-10-21 21:05 ` [PATCH v3 41/48] tcg/optimize: Sink commutative operand swapping into fold functions Richard Henderson
2021-10-26 16:27   ` Alex Bennée
2021-10-26 19:33     ` Richard Henderson
2021-10-27 13:22       ` Alex Bennée
2021-10-21 21:05 ` [PATCH v3 42/48] tcg/optimize: Add more simplifications for orc Richard Henderson
2021-10-26 16:22   ` Alex Bennée
2021-10-21 21:05 ` [PATCH v3 43/48] tcg/optimize: Stop forcing z_mask to "garbage" for 32-bit values Richard Henderson
2021-10-26 16:35   ` Alex Bennée
2021-10-21 21:05 ` [PATCH v3 44/48] tcg/optimize: Optimize sign extensions Richard Henderson
2021-10-26 16:34   ` Alex Bennée
2021-10-21 21:05 ` [PATCH v3 45/48] tcg/optimize: Propagate sign info for logical operations Richard Henderson
2021-10-26 16:35   ` Alex Bennée
2021-10-21 21:05 ` [PATCH v3 46/48] tcg/optimize: Propagate sign info for setcond Richard Henderson
2021-10-26 16:36   ` Alex Bennée
2021-10-21 21:05 ` [PATCH v3 47/48] tcg/optimize: Propagate sign info for bit counting Richard Henderson
2021-10-26 16:36   ` Alex Bennée
2021-10-21 21:05 ` [PATCH v3 48/48] tcg/optimize: Propagate sign info for shifting Richard Henderson
2021-10-26 16:37   ` Alex Bennée

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