Re: [PATCH] Add udivmoddi4.

On Mon, Jun 07, 2021 at 11:20:47AM +0200, Christian Melki wrote:

A newer toolchain will emit udivmoddi4 for certain divide + modulo operations instead of a separate divide and modulo operation. AFAIU, this would be sufficient.

Signed-off-by: Christian Melki christian.melki@t2data.com

arch/x86/lib/div64.c | 5 +++++ 1 file changed, 5 insertions(+)

diff --git a/arch/x86/lib/div64.c b/arch/x86/lib/div64.c index 2bea205f60..a5b536fbc5 100644 --- a/arch/x86/lib/div64.c +++ b/arch/x86/lib/div64.c @@ -110,3 +110,8 @@ u64 __umoddi3(u64 num, u64 den) _64bit_divide(num, den, &v); return v; }

+u64 __udivmoddi4(u64 num, u64 den, u64 *rem) +{

• return _64bit_divide(num, den, rem);

+}

How do you trigger this and should you not be using do_div(), etc, instead?