On 10/29/18 10:31 AM, Sam Tebbs wrote:
> On 10/23/2018 02:50 PM, Richard Earnshaw (lists) wrote:
>
>> On 22/10/2018 10:02, Sam Tebbs wrote:
>>> diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
>>> index
>>>
On 10/23/2018 02:50 PM, Richard Earnshaw (lists) wrote:
> On 22/10/2018 10:02, Sam Tebbs wrote:
>> diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
>> index
>> d7473418a8eb62b2757017cd1675493f86e41ef4..77e6f75cc15f06733df7b47906ee00580bea8d29
>> 100644
>> ---
On 22/10/2018 10:02, Sam Tebbs wrote:
> Hi all,
>
> This patch replaces the umov instruction in the aarch64 popcount
> expansion with
> the less expensive fmov instruction.
>
> Example:
>
> int foo (int a) {
> return __builtin_popcount (a);
> }
>
> would generate:
>
> foo:
> uxtw x0,
Hi all,
This patch replaces the umov instruction in the aarch64 popcount expansion with
the less expensive fmov instruction.
Example:
int foo (int a) {
return __builtin_popcount (a);
}
would generate:
foo:
uxtw x0, w0
fmov d0, x0
cnt v0.8b, v0.8b
addv b0, v0.8b
umov w0,
