On 7/29/20 7:27 AM, tugouxp wrote: > HI folks: > on each tb block start, there are following ir code, and the most confusing > me is that the postfix of each line "dead:" flag, what it is represent > precisely? > i guess it may be related to the register or varible liveness for help > generating tghe target machine code, but i cant get the precisely connection > of > the dead attrribute with qemu internal varibles. > for example, why the line 61 use "dead:1" and the line 63 use "dead: 0, 1"? > what is the precisely meaning of the number after the "dead:" word? > > thank you! > > > 60 OP after optimization and liveness analysis: > > 61 ld_i32 tmp5,env,$0xffffffffffffffec dead: 1 > > 62 movi_i32 tmp6,$0x0 > > 63 brcond_i32 tmp5,tmp6,lt,$L0 dead: 0 1
The numbers are the index of the argument that is dead. E.g. here, both tmp5 and tmp6 are dead. r~
