diff mbox series

[v2,26/48] tcg/optimize: Split out fold_count_zeros

Message ID 20211007195456.1168070-27-richard.henderson@linaro.org
State New
Headers show
Series tcg: optimize redundant sign extensions | expand

Commit Message

Richard Henderson Oct. 7, 2021, 7:54 p.m. UTC 
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/optimize.c | 32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)
diff mbox series

Patch

diff --git a/tcg/optimize.c b/tcg/optimize.c
index dd78982330..d2e5727662 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -875,6 +875,20 @@  static bool fold_call(OptContext *ctx, TCGOp *op)
     return true;
 }
 
+static bool fold_count_zeros(OptContext *ctx, TCGOp *op)
+{
+    if (arg_is_const(op->args[1])) {
+        uint64_t t = arg_info(op->args[1])->val;
+
+        if (t != 0) {
+            t = do_constant_folding(op->opc, t, 0);
+            return tcg_opt_gen_movi(ctx, op, op->args[0], t);
+        }
+        return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[2]);
+    }
+    return false;
+}
+
 static bool fold_ctpop(OptContext *ctx, TCGOp *op)
 {
     return fold_const1(ctx, op);
@@ -1726,20 +1740,6 @@  void tcg_optimize(TCGContext *s)
             }
             break;
 
-        CASE_OP_32_64(clz):
-        CASE_OP_32_64(ctz):
-            if (arg_is_const(op->args[1])) {
-                TCGArg v = arg_info(op->args[1])->val;
-                if (v != 0) {
-                    tmp = do_constant_folding(opc, v, 0);
-                    tcg_opt_gen_movi(&ctx, op, op->args[0], tmp);
-                } else {
-                    tcg_opt_gen_mov(&ctx, op, op->args[0], op->args[2]);
-                }
-                continue;
-            }
-            break;
-
         default:
             break;
 
@@ -1764,6 +1764,10 @@  void tcg_optimize(TCGContext *s)
         case INDEX_op_brcond2_i32:
             done = fold_brcond2(&ctx, op);
             break;
+        CASE_OP_32_64(clz):
+        CASE_OP_32_64(ctz):
+            done = fold_count_zeros(&ctx, op);
+            break;
         CASE_OP_32_64(ctpop):
             done = fold_ctpop(&ctx, op);
             break;