Christoph Hellwig <hch@xxxxxxxxxxxxx> 于2023年4月5日周三 13:40写道： > > On Mon, Apr 03, 2023 at 09:53:04PM +0800, wuchi wrote: > > - if (block > ext_block) > > - return ext_pblk + (block - ext_block); > > - else > > - return ext_pblk - (ext_block - block); > > + return ext_pblk + ((signed long long)block - (signed long long)ext_block); > > And what exactly is the value add here, except for turning an easy > to parse statement into a complex expression using casts? > Yes，it will be more complex. the original intention is to reduce the conditional branch. =======
