Maciej W. Rozycki wrote:
Here are my proposals I've referred to previously. Instruction counts
are 9, 9 and 10, respectively, as I've missed an additional instruction
required to handle shifts by 0 (or actually any multiples of 64).
IMHO handling a shift by zero correctly is important.
"not %1, %3\n\t" "srlv %1, %L2, %1\n\t" "srl %1, %1, 1\n\t"
Why not the shorter:
"neg %1, %3\n\t" "srlv %1, %L2, %1\n\t"
And then in __ashrdi3:
"andi %1, %3, 0x20\n\t" ".set push\n\t" ".set noat\n\t" "sra $1, %M2, 31\n\t" "movn %L0, %M0, %1\n\t" "movn %M0, $1, %1\n\t" ".set pop"
Cute, but I think that should be
"sra $1, %M0, 31\n\t"
(i.e %M0 not %M2)
Nigel
