[PULL 20/56] tcg/optimize: Split out fold_const{1,2}

[Richard Henderson]

Split out a whole bunch of placeholder functions, which are
currently identical.  That won't last as more code gets moved.

Use CASE_32_64_VEC for some logical operators that previously
missed the addition of vectors.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/optimize.c | 271 +++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 219 insertions(+), 52 deletions(-)

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 159a5a9ee5..5c3f8e8fcd 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -660,6 +660,60 @@ static void finish_folding(OptContext *ctx, TCGOp *op)
     }
 }
 
+/*
+ * The fold_* functions return true when processing is complete,
+ * usually by folding the operation to a constant or to a copy,
+ * and calling tcg_opt_gen_{mov,movi}.  They may do other things,
+ * like collect information about the value produced, for use in
+ * optimizing a subsequent operation.
+ *
+ * These first fold_* functions are all helpers, used by other
+ * folders for more specific operations.
+ */
+
+static bool fold_const1(OptContext *ctx, TCGOp *op)
+{
+    if (arg_is_const(op->args[1])) {
+        uint64_t t;
+
+        t = arg_info(op->args[1])->val;
+        t = do_constant_folding(op->opc, t, 0);
+        return tcg_opt_gen_movi(ctx, op, op->args[0], t);
+    }
+    return false;
+}
+
+static bool fold_const2(OptContext *ctx, TCGOp *op)
+{
+    if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
+        uint64_t t1 = arg_info(op->args[1])->val;
+        uint64_t t2 = arg_info(op->args[2])->val;
+
+        t1 = do_constant_folding(op->opc, t1, t2);
+        return tcg_opt_gen_movi(ctx, op, op->args[0], t1);
+    }
+    return false;
+}
+
+/*
+ * These outermost fold_<op> functions are sorted alphabetically.
+ */
+
+static bool fold_add(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
+static bool fold_and(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
+static bool fold_andc(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
 static bool fold_call(OptContext *ctx, TCGOp *op)
 {
     TCGContext *s = ctx->tcg;
@@ -692,6 +746,31 @@ static bool fold_call(OptContext *ctx, TCGOp *op)
     return true;
 }
 
+static bool fold_ctpop(OptContext *ctx, TCGOp *op)
+{
+    return fold_const1(ctx, op);
+}
+
+static bool fold_divide(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
+static bool fold_eqv(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
+static bool fold_exts(OptContext *ctx, TCGOp *op)
+{
+    return fold_const1(ctx, op);
+}
+
+static bool fold_extu(OptContext *ctx, TCGOp *op)
+{
+    return fold_const1(ctx, op);
+}
+
 static bool fold_mb(OptContext *ctx, TCGOp *op)
 {
     /* Eliminate duplicate and redundant fence instructions.  */
@@ -716,6 +795,46 @@ static bool fold_mb(OptContext *ctx, TCGOp *op)
     return true;
 }
 
+static bool fold_mul(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
+static bool fold_mul_highpart(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
+static bool fold_nand(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
+static bool fold_neg(OptContext *ctx, TCGOp *op)
+{
+    return fold_const1(ctx, op);
+}
+
+static bool fold_nor(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
+static bool fold_not(OptContext *ctx, TCGOp *op)
+{
+    return fold_const1(ctx, op);
+}
+
+static bool fold_or(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
+static bool fold_orc(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
 static bool fold_qemu_ld(OptContext *ctx, TCGOp *op)
 {
     /* Opcodes that touch guest memory stop the mb optimization.  */
@@ -730,6 +849,26 @@ static bool fold_qemu_st(OptContext *ctx, TCGOp *op)
     return false;
 }
 
+static bool fold_remainder(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
+static bool fold_shift(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
+static bool fold_sub(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
+static bool fold_xor(OptContext *ctx, TCGOp *op)
+{
+    return fold_const2(ctx, op);
+}
+
 /* Propagate constants and copies, fold constant expressions. */
 void tcg_optimize(TCGContext *s)
 {
@@ -1276,26 +1415,6 @@ void tcg_optimize(TCGContext *s)
             }
             break;
 
-        CASE_OP_32_64(not):
-        CASE_OP_32_64(neg):
-        CASE_OP_32_64(ext8s):
-        CASE_OP_32_64(ext8u):
-        CASE_OP_32_64(ext16s):
-        CASE_OP_32_64(ext16u):
-        CASE_OP_32_64(ctpop):
-        case INDEX_op_ext32s_i64:
-        case INDEX_op_ext32u_i64:
-        case INDEX_op_ext_i32_i64:
-        case INDEX_op_extu_i32_i64:
-        case INDEX_op_extrl_i64_i32:
-        case INDEX_op_extrh_i64_i32:
-            if (arg_is_const(op->args[1])) {
-                tmp = do_constant_folding(opc, arg_info(op->args[1])->val, 0);
-                tcg_opt_gen_movi(&ctx, op, op->args[0], tmp);
-                continue;
-            }
-            break;
-
         CASE_OP_32_64(bswap16):
         CASE_OP_32_64(bswap32):
         case INDEX_op_bswap64_i64:
@@ -1307,36 +1426,6 @@ void tcg_optimize(TCGContext *s)
             }
             break;
 
-        CASE_OP_32_64(add):
-        CASE_OP_32_64(sub):
-        CASE_OP_32_64(mul):
-        CASE_OP_32_64(or):
-        CASE_OP_32_64(and):
-        CASE_OP_32_64(xor):
-        CASE_OP_32_64(shl):
-        CASE_OP_32_64(shr):
-        CASE_OP_32_64(sar):
-        CASE_OP_32_64(rotl):
-        CASE_OP_32_64(rotr):
-        CASE_OP_32_64(andc):
-        CASE_OP_32_64(orc):
-        CASE_OP_32_64(eqv):
-        CASE_OP_32_64(nand):
-        CASE_OP_32_64(nor):
-        CASE_OP_32_64(muluh):
-        CASE_OP_32_64(mulsh):
-        CASE_OP_32_64(div):
-        CASE_OP_32_64(divu):
-        CASE_OP_32_64(rem):
-        CASE_OP_32_64(remu):
-            if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
-                tmp = do_constant_folding(opc, arg_info(op->args[1])->val,
-                                          arg_info(op->args[2])->val);
-                tcg_opt_gen_movi(&ctx, op, op->args[0], tmp);
-                continue;
-            }
-            break;
-
         CASE_OP_32_64(clz):
         CASE_OP_32_64(ctz):
             if (arg_is_const(op->args[1])) {
@@ -1637,9 +1726,73 @@ void tcg_optimize(TCGContext *s)
             }
             break;
 
+        default:
+            break;
+
+        /* ---------------------------------------------------------- */
+        /* Sorted alphabetically by opcode as much as possible. */
+
+        CASE_OP_32_64_VEC(add):
+            done = fold_add(&ctx, op);
+            break;
+        CASE_OP_32_64_VEC(and):
+            done = fold_and(&ctx, op);
+            break;
+        CASE_OP_32_64_VEC(andc):
+            done = fold_andc(&ctx, op);
+            break;
+        CASE_OP_32_64(ctpop):
+            done = fold_ctpop(&ctx, op);
+            break;
+        CASE_OP_32_64(div):
+        CASE_OP_32_64(divu):
+            done = fold_divide(&ctx, op);
+            break;
+        CASE_OP_32_64(eqv):
+            done = fold_eqv(&ctx, op);
+            break;
+        CASE_OP_32_64(ext8s):
+        CASE_OP_32_64(ext16s):
+        case INDEX_op_ext32s_i64:
+        case INDEX_op_ext_i32_i64:
+            done = fold_exts(&ctx, op);
+            break;
+        CASE_OP_32_64(ext8u):
+        CASE_OP_32_64(ext16u):
+        case INDEX_op_ext32u_i64:
+        case INDEX_op_extu_i32_i64:
+        case INDEX_op_extrl_i64_i32:
+        case INDEX_op_extrh_i64_i32:
+            done = fold_extu(&ctx, op);
+            break;
         case INDEX_op_mb:
             done = fold_mb(&ctx, op);
             break;
+        CASE_OP_32_64(mul):
+            done = fold_mul(&ctx, op);
+            break;
+        CASE_OP_32_64(mulsh):
+        CASE_OP_32_64(muluh):
+            done = fold_mul_highpart(&ctx, op);
+            break;
+        CASE_OP_32_64(nand):
+            done = fold_nand(&ctx, op);
+            break;
+        CASE_OP_32_64(neg):
+            done = fold_neg(&ctx, op);
+            break;
+        CASE_OP_32_64(nor):
+            done = fold_nor(&ctx, op);
+            break;
+        CASE_OP_32_64_VEC(not):
+            done = fold_not(&ctx, op);
+            break;
+        CASE_OP_32_64_VEC(or):
+            done = fold_or(&ctx, op);
+            break;
+        CASE_OP_32_64_VEC(orc):
+            done = fold_orc(&ctx, op);
+            break;
         case INDEX_op_qemu_ld_i32:
         case INDEX_op_qemu_ld_i64:
             done = fold_qemu_ld(&ctx, op);
@@ -1649,8 +1802,22 @@ void tcg_optimize(TCGContext *s)
         case INDEX_op_qemu_st_i64:
             done = fold_qemu_st(&ctx, op);
             break;
-
-        default:
+        CASE_OP_32_64(rem):
+        CASE_OP_32_64(remu):
+            done = fold_remainder(&ctx, op);
+            break;
+        CASE_OP_32_64(rotl):
+        CASE_OP_32_64(rotr):
+        CASE_OP_32_64(sar):
+        CASE_OP_32_64(shl):
+        CASE_OP_32_64(shr):
+            done = fold_shift(&ctx, op);
+            break;
+        CASE_OP_32_64_VEC(sub):
+            done = fold_sub(&ctx, op);
+            break;
+        CASE_OP_32_64_VEC(xor):
+            done = fold_xor(&ctx, op);
             break;
         }
 
-- 
2.25.1