Split expression simplification in multiple parts so that a given op
can appear multiple times. This patch should not change anything.
Reviewed-by: Richard Henderson <r...@twiddle.net>
Signed-off-by: Aurelien Jarno <aurel...@aurel32.net>
---
tcg/optimize.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/tcg/optimize.c b/tcg/optimize.c
index 9c65474..63f970d 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -322,7 +322,7 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t
*tcg_opc_ptr,
break;
}
- /* Simplify expression if possible. */
+ /* Simplify expression for "op r, a, 0 => mov r, a" cases */
switch (op) {
CASE_OP_32_64(add):
CASE_OP_32_64(sub):
@@ -352,6 +352,12 @@ static TCGArg *tcg_constant_folding(TCGContext *s,
uint16_t *tcg_opc_ptr,
continue;
}
break;
+ default:
+ break;
+ }
+
+ /* Simplify expression for "op r, a, 0 => movi r, 0" cases */
+ switch (op) {
CASE_OP_32_64(mul):
if ((temps[args[2]].state == TCG_TEMP_CONST
&& temps[args[2]].val == 0)) {
@@ -362,6 +368,12 @@ static TCGArg *tcg_constant_folding(TCGContext *s,
uint16_t *tcg_opc_ptr,
continue;
}
break;
+ default:
+ break;
+ }
+
+ /* Simplify expression for "op r, a, a => mov r, a" cases */
+ switch (op) {
CASE_OP_32_64(or):
CASE_OP_32_64(and):
if (args[1] == args[2]) {
--
1.7.10.4
