On Tue, Aug 2, 2022 at 4:59 PM Roger Sayle wrote:
>
>
> This patch adds a peephole2 to i386.md to implement the suggestion in
> PR target/47949, of using xchg instead of mov for moving values to/from
> the %rax/%eax register, controlled by -Oz, as the xchg instruction is
> one byte shorter than th
This patch adds a peephole2 to i386.md to implement the suggestion in
PR target/47949, of using xchg instead of mov for moving values to/from
the %rax/%eax register, controlled by -Oz, as the xchg instruction is
one byte shorter than the move it is replacing.
The new test case is taken from the P
