tcg/optimize: Use fold_masks_zs in fold_andc

Avoid the use of the OptContext slots.  Find TempOptInfo once.
Avoid double inversion of the value of second const operand.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 4a5b52916a867251f2c9f417d56944dc4a109b22..2096d705bdede6340cf12bc131def21ac619e83e 100644 (file)
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1330,7 +1330,8 @@ static bool fold_and(OptContext *ctx, TCGOp *op)
 
 static bool fold_andc(OptContext *ctx, TCGOp *op)
 {
-    uint64_t z1;
+    uint64_t z_mask, s_mask;
+    TempOptInfo *t1, *t2;
 
     if (fold_const2(ctx, op) ||
         fold_xx_to_i(ctx, op, 0) ||
@@ -1339,24 +1340,24 @@ static bool fold_andc(OptContext *ctx, TCGOp *op)
         return true;
     }
 
-    z1 = arg_info(op->args[1])->z_mask;
+    t1 = arg_info(op->args[1]);
+    t2 = arg_info(op->args[2]);
+    z_mask = t1->z_mask;
 
     /*
      * Known-zeros does not imply known-ones.  Therefore unless
      * arg2 is constant, we can't infer anything from it.
      */
-    if (arg_is_const(op->args[2])) {
-        uint64_t z2 = ~arg_info(op->args[2])->z_mask;
-        if (fold_affected_mask(ctx, op, z1 & ~z2)) {
+    if (ti_is_const(t2)) {
+        uint64_t v2 = ti_const_val(t2);
+        if (fold_affected_mask(ctx, op, z_mask & v2)) {
             return true;
         }
-        z1 &= z2;
+        z_mask &= ~v2;
     }
-    ctx->z_mask = z1;
 
-    ctx->s_mask = arg_info(op->args[1])->s_mask
-                & arg_info(op->args[2])->s_mask;
-    return fold_masks(ctx, op);
+    s_mask = t1->s_mask & t2->s_mask;
+    return fold_masks_zs(ctx, op, z_mask, s_mask);
 }
 
 static bool fold_brcond(OptContext *ctx, TCGOp *op)