Thanks for reply as you said:
> Every time you write obj.x you get a new inline cache. > why not use the same inline cache? 在 2016年1月18日星期一 UTC+8下午2:05:37，Toon Verwaest写道： > > Every time you write obj.x you get a new inline cache. The IC in test is > used twice, and so can transition further from 0 through . to 1. The other > 2 are used only once and hence only get to . from 0. > > Iirc for global references within the same straight-line code we reuse the > cache, which is why the load for test and obj themselves do manage to get > to 1 even though they are supposedly independent loads. > > Regards, > Toon > > On Mon, Jan 18, 2016, 03:03 Yong Wang <[email protected] <javascript:>> > wrote: > >> Hi v8-dev, >> I test some code like that: >> >> function test(obj) >> { >> return obj.x; >> } >> >> var obj = {x:1}; >> test(obj); >> test(obj); >> >> obj.x; >> obj.x; >> >> and add --trace-ic, v8 output inline log: >> >> [LoadIC in ~+116 at test.js:7 (0->.) #test] >> [LoadIC in ~+140 at test.js:7 (0->.) #obj] >> [LoadIC in ~test+38 at test.js:3 (0->.) #x] >> [LoadIC in ~+179 at test.js:8 (.->1) #test] >> [LoadIC in ~+203 at test.js:8 (.->1) #obj] >> [LoadIC in ~test+38 at test.js:3 (.->1) #x] >> [LoadIC in ~+259 at test.js:10 (0->.) #x] >> [LoadIC in ~+294 at test.js:11 (0->.) #x] >> >> it seems that direct call 'obj.x', inline stat always is '0'. >> but in function test, it will change to (0->.->1); >> >> so what's different between this? >> >> Thanks in advance. >> >> >> >> -- >> -- >> v8-users mailing list >> [email protected] <javascript:> >> http://groups.google.com/group/v8-users >> --- >> You received this message because you are subscribed to the Google Groups >> "v8-users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > -- -- v8-users mailing list [email protected] http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
