On 06/19/14 03:44, Zhenqiang Chen wrote:
ChangeLog:
2014-06-17 Zhenqiang Chen
* cprop.c (try_replace_reg): Check cost for constants.
diff --git a/gcc/cprop.c b/gcc/cprop.c
index aef3ee8..c9cf02a 100644
--- a/gcc/cprop.c
+++ b/gcc/cprop.c
@@ -733,6 +733,14 @@ try_replace_reg (rtx fr
On 17 June 2014 17:42, Zhenqiang Chen wrote:
> On 17 June 2014 16:15, Richard Biener wrote:
>> On Tue, Jun 17, 2014 at 4:11 AM, Zhenqiang Chen
>> wrote:
>>> Hi,
>>>
>>> For some large constant, ports like ARM, need one more instructions to
>>> operate it. e.g
>>>
>>> #define MASK 0xfe00ff
>>> vo
On 17 June 2014 16:15, Richard Biener wrote:
> On Tue, Jun 17, 2014 at 4:11 AM, Zhenqiang Chen
> wrote:
>> Hi,
>>
>> For some large constant, ports like ARM, need one more instructions to
>> operate it. e.g
>>
>> #define MASK 0xfe00ff
>> void maskdata (int * data, int len)
>> {
>>int i = len;
On Tue, Jun 17, 2014 at 4:11 AM, Zhenqiang Chen
wrote:
> Hi,
>
> For some large constant, ports like ARM, need one more instructions to
> operate it. e.g
>
> #define MASK 0xfe00ff
> void maskdata (int * data, int len)
> {
>int i = len;
>for (; i > 0; i -= 2)
> {
> data[i] &= MASK
Hi,
For some large constant, ports like ARM, need one more instructions to
operate it. e.g
#define MASK 0xfe00ff
void maskdata (int * data, int len)
{
int i = len;
for (; i > 0; i -= 2)
{
data[i] &= MASK;
data[i + 1] &= MASK;
}
}
Need two instructions for each AND opera
