Re: [PATCH v2 04/35] tcg/optimize: Do swap_commutative2 in do_constant_folding_cond2

[Philippe Mathieu-Daudé]

On 28/10/23 21:44, Richard Henderson wrote:
> Mirror the new do_constant_folding_cond1 by doing all
> argument and condition adjustment within one helper.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>   tcg/optimize.c | 107 ++++++++++++++++++++++++++-----------------------
>   1 file changed, 57 insertions(+), 50 deletions(-)

Easier to review with a preliminary code move patch:

-- >8 --
diff --git a/tcg/optimize.c b/tcg/optimize.c
index 89cc794d24..ae8debf6f2 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -589,43 +589,6 @@ static int do_constant_folding_cond(TCGType type, 
TCGArg x,
     return -1;
 }

-/*
- * 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];
-
-    if (arg_is_const(bl) && arg_is_const(bh)) {
-        tcg_target_ulong blv = arg_info(bl)->val;
-        tcg_target_ulong bhv = arg_info(bh)->val;
-        uint64_t b = deposit64(blv, 32, 32, bhv);
-
-        if (arg_is_const(al) && arg_is_const(ah)) {
-            tcg_target_ulong alv = arg_info(al)->val;
-            tcg_target_ulong ahv = arg_info(ah)->val;
-            uint64_t a = deposit64(alv, 32, 32, ahv);
-            return do_constant_folding_cond_64(a, b, c);
-        }
-        if (b == 0) {
-            switch (c) {
-            case TCG_COND_LTU:
-                return 0;
-            case TCG_COND_GEU:
-                return 1;
-            default:
-                break;
-            }
-        }
-    }
-    if (args_are_copies(al, bl) && args_are_copies(ah, bh)) {
-        return do_constant_folding_cond_eq(c);
-    }
-    return -1;
-}
-
 /**
  * swap_commutative:
  * @dest: TCGArg of the destination argument, or NO_DEST.
@@ -672,6 +635,10 @@ static bool swap_commutative2(TCGArg *p1, TCGArg *p2)
     return false;
 }

+/*
+ * 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_cond1(OptContext *ctx, TCGArg dest,
                                      TCGArg *p1, TCGArg *p2, TCGArg 
*pcond)
 {
@@ -689,6 +656,39 @@ static int do_constant_folding_cond1(OptContext 
*ctx, TCGArg dest,
     return r;
 }

+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];
+
+    if (arg_is_const(bl) && arg_is_const(bh)) {
+        tcg_target_ulong blv = arg_info(bl)->val;
+        tcg_target_ulong bhv = arg_info(bh)->val;
+        uint64_t b = deposit64(blv, 32, 32, bhv);
+
+        if (arg_is_const(al) && arg_is_const(ah)) {
+            tcg_target_ulong alv = arg_info(al)->val;
+            tcg_target_ulong ahv = arg_info(ah)->val;
+            uint64_t a = deposit64(alv, 32, 32, ahv);
+            return do_constant_folding_cond_64(a, b, c);
+        }
+        if (b == 0) {
+            switch (c) {
+            case TCG_COND_LTU:
+                return 0;
+            case TCG_COND_GEU:
+                return 1;
+            default:
+                break;
+            }
+        }
+    }
+    if (args_are_copies(al, bl) && args_are_copies(ah, bh)) {
+        return do_constant_folding_cond_eq(c);
+    }
+    return -1;
+}
+
 static void init_arguments(OptContext *ctx, TCGOp *op, int nb_args)
 {
     for (int i = 0; i < nb_args; i++) {
---

To the best of my knowledge:

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>