|
 |
5544c1 |
From bbed332c7ad12e9885d3f457f366fa0b29445dcd Mon Sep 17 00:00:00 2001
|
|
|
5544c1 |
From: Aurelien Jarno <aurelien@aurel32.net>
|
|
|
5544c1 |
Date: Thu, 6 Sep 2012 16:47:14 +0200
|
|
|
5544c1 |
Subject: [PATCH] tcg/optimize: simplify shift/rot r, 0, a => movi r, 0 cases
|
|
|
5544c1 |
|
|
|
5544c1 |
shift/rot r, 0, a is equivalent to movi r, 0.
|
|
|
5544c1 |
|
|
|
5544c1 |
Reviewed-by: Richard Henderson <rth@twiddle.net>
|
|
|
5544c1 |
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
|
|
|
5544c1 |
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
|
|
|
5544c1 |
---
|
|
|
5544c1 |
tcg/optimize.c | 20 ++++++++++++++++++++
|
|
|
5544c1 |
1 file changed, 20 insertions(+)
|
|
|
5544c1 |
|
|
|
5544c1 |
diff --git a/tcg/optimize.c b/tcg/optimize.c
|
|
|
5544c1 |
index c12cb2b..1698ba3 100644
|
|
|
5544c1 |
--- a/tcg/optimize.c
|
|
|
5544c1 |
+++ b/tcg/optimize.c
|
|
|
5544c1 |
@@ -322,6 +322,26 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
|
|
|
5544c1 |
break;
|
|
|
5544c1 |
}
|
|
|
5544c1 |
|
|
|
5544c1 |
+ /* Simplify expressions for "shift/rot r, 0, a => movi r, 0" */
|
|
|
5544c1 |
+ switch (op) {
|
|
|
5544c1 |
+ CASE_OP_32_64(shl):
|
|
|
5544c1 |
+ CASE_OP_32_64(shr):
|
|
|
5544c1 |
+ CASE_OP_32_64(sar):
|
|
|
5544c1 |
+ CASE_OP_32_64(rotl):
|
|
|
5544c1 |
+ CASE_OP_32_64(rotr):
|
|
|
5544c1 |
+ if (temps[args[1]].state == TCG_TEMP_CONST
|
|
|
5544c1 |
+ && temps[args[1]].val == 0) {
|
|
|
5544c1 |
+ gen_opc_buf[op_index] = op_to_movi(op);
|
|
|
5544c1 |
+ tcg_opt_gen_movi(gen_args, args[0], 0, nb_temps, nb_globals);
|
|
|
5544c1 |
+ args += 3;
|
|
|
5544c1 |
+ gen_args += 2;
|
|
|
5544c1 |
+ continue;
|
|
|
5544c1 |
+ }
|
|
|
5544c1 |
+ break;
|
|
|
5544c1 |
+ default:
|
|
|
5544c1 |
+ break;
|
|
|
5544c1 |
+ }
|
|
|
5544c1 |
+
|
|
|
5544c1 |
/* Simplify expression for "op r, a, 0 => mov r, a" cases */
|
|
|
5544c1 |
switch (op) {
|
|
|
5544c1 |
CASE_OP_32_64(add):
|
|
|
5544c1 |
--
|
|
|
5544c1 |
1.7.12.1
|
|
|
5544c1 |
|