On Fri, Oct 02, 2015 at 10:17:11AM +0100, Renlin Li wrote:
> Hi all,
>
> This is a simple patch to add a new cmovdi_insn_uxtw rtx pattern to
> aarch64 backend.
>
> For the following simple test case:
>
> unsigned long long
> foo (unsigned int a, unsigned int b, unsigned int c)
> {
> return a ? b : c;
> }
>
> With this new pattern, the new code-generation will be:
>
> cmp w0, wzr
> csel w0, w1, w2, ne
> ret
>
> Without the path, the old code-generation is like this:
> uxtw x2, w2
> uxtw x1, w1
> cmp w0, wzr
> csel x0, x2, x1, eq
> ret
>
>
> aarch64-none-elf regression test Okay. Okay to commit?
OK.
Thanks,
James
> gcc/ChangeLog:
>
> 2015-10-02 Renlin Li <renlin...@arm.com>
>
> PR target/66776
> * config/aarch64/aarch64.md (cmovdi_insn_uxtw): New pattern.
>
> gcc/testsuite/ChangeLog:
>
> 2015-10-02 Renlin Li <renlin...@arm.com>
>
> PR target/66776
> * gcc.target/aarch64/pr66776.c: New.
>
