diff mbox series

[v3,32/48] tcg/optimize: Split out fold_xi_to_i

Message ID 20211021210539.825582-33-richard.henderson@linaro.org
State Superseded
Headers show
Series tcg: optimize redundant sign extensions | expand

Commit Message

Richard Henderson Oct. 21, 2021, 9:05 p.m. UTC 
Pull the "op r, a, 0 => movi r, 0" optimization into a function,
and use it in the outer opcode fold functions.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

---
 tcg/optimize.c | 32 +++++++++++++++-----------------
 1 file changed, 15 insertions(+), 17 deletions(-)

-- 
2.25.1

Comments

Luis Fernando Fujita Pires Oct. 22, 2021, 9:17 p.m. UTC | #1 
From: Richard Henderson <richard.henderson@linaro.org>

> Pull the "op r, a, 0 => movi r, 0" optimization into a function, and use it in the

> outer opcode fold functions.

> 

> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

> ---

>  tcg/optimize.c | 32 +++++++++++++++-----------------

>  1 file changed, 15 insertions(+), 17 deletions(-)


Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>


--
Luis Pires
Instituto de Pesquisas ELDORADO
Aviso Legal - Disclaimer <https://www.eldorado.org.br/disclaimer.html>
diff mbox series

Patch

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 8dfe8694da..78e2ff5b38 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -695,6 +695,15 @@  static bool fold_const2(OptContext *ctx, TCGOp *op)
     return false;
 }
 
+/* If the binary operation has second argument @i, fold to @i. */
+static bool fold_xi_to_i(OptContext *ctx, TCGOp *op, uint64_t i)
+{
+    if (arg_is_const(op->args[2]) && arg_info(op->args[2])->val == i) {
+        return tcg_opt_gen_movi(ctx, op, op->args[0], i);
+    }
+    return false;
+}
+
 /* If the binary operation has both arguments equal, fold to @i. */
 static bool fold_xx_to_i(OptContext *ctx, TCGOp *op, uint64_t i)
 {
@@ -763,6 +772,7 @@  static bool fold_add2_i32(OptContext *ctx, TCGOp *op)
 static bool fold_and(OptContext *ctx, TCGOp *op)
 {
     if (fold_const2(ctx, op) ||
+        fold_xi_to_i(ctx, op, 0) ||
         fold_xx_to_x(ctx, op)) {
         return true;
     }
@@ -1076,7 +1086,11 @@  static bool fold_movcond(OptContext *ctx, TCGOp *op)
 
 static bool fold_multiply(OptContext *ctx, TCGOp *op)
 {
-    return fold_const2(ctx, op);
+    if (fold_const2(ctx, op) ||
+        fold_xi_to_i(ctx, op, 0)) {
+        return true;
+    }
+    return false;
 }
 
 static bool fold_mulu2_i32(OptContext *ctx, TCGOp *op)
@@ -1738,22 +1752,6 @@  void tcg_optimize(TCGContext *s)
             continue;
         }
 
-        /* Simplify expression for "op r, a, 0 => movi r, 0" cases */
-        switch (opc) {
-        CASE_OP_32_64_VEC(and):
-        CASE_OP_32_64_VEC(mul):
-        CASE_OP_32_64(muluh):
-        CASE_OP_32_64(mulsh):
-            if (arg_is_const(op->args[2])
-                && arg_info(op->args[2])->val == 0) {
-                tcg_opt_gen_movi(&ctx, op, op->args[0], 0);
-                continue;
-            }
-            break;
-        default:
-            break;
-        }
-
         /*
          * Process each opcode.
          * Sorted alphabetically by opcode as much as possible.