On 10/19/21 12:28, Jakub Jelinek wrote:
On Tue, Oct 19, 2021 at 09:47:45AM +0530, Siddhesh Poyarekar wrote:
Compute the unknown size value as a function of the min/max bit of
object_size_type. This transforms into a neat little branchless
sequence on x86_64:
movl%edi, %eax
On Tue, Oct 19, 2021 at 09:47:45AM +0530, Siddhesh Poyarekar wrote:
> Compute the unknown size value as a function of the min/max bit of
> object_size_type. This transforms into a neat little branchless
> sequence on x86_64:
>
> movl%edi, %eax
> sarl%eax
> xorl$1, %e
Compute the unknown size value as a function of the min/max bit of
object_size_type. This transforms into a neat little branchless
sequence on x86_64:
movl%edi, %eax
sarl%eax
xorl$1, %eax
negl%eax
cltq
which should be faster than loading th
