On Mon, Aug 3, 2020 at 2:20 AM Richard Biener via Gcc-patches
wrote:
>
> On Sun, Aug 2, 2020 at 6:31 PM Roger Sayle wrote:
> >
> >
> >
> > PR rtl-optimization/60473 was a code quality regression that has
> >
> > been cured by improvements to register allocation. For the function
> >
> > in the t
>> Since GCC 4.9 (including current mainline), it generates optimal
>>
>> code with no mov instructions, matching what used to be generated
>>
>> in GCC 4.1.
>>
>>
>>
>> foo:rdtsc
>>
>> sal rdx, 32
>>
>> or rax, rdx
>>
>> ret
>>
>>
>>
>> This test case, which ha
On Sun, Aug 2, 2020 at 6:31 PM Roger Sayle wrote:
>
>
>
> PR rtl-optimization/60473 was a code quality regression that has
>
> been cured by improvements to register allocation. For the function
>
> in the test case, GCC 4.4, 4.5 and 4.6 generated very poor code
>
> requiring two mov instructions
