From: tugouxp <13824125580@163.com>
To: qemu-devel@nongnu.org
Subject: What this mean "dead: 1" and "dead: 0 1" on each tb block start?
Date: Wed, 29 Jul 2020 22:27:55 +0800 (CST) [thread overview]
Message-ID: <6807386b.7ba3.1739af8fc12.Coremail.13824125580@163.com> (raw)
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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
64
65 ---- 60000004 00000000 00000e04
66 movi_i32 tmp5,$0x60000010
67 mov_i32 tmp7,tmp5 dead: 1
68 qemu_ld_i32 tmp6,tmp7,leul,3 dead: 1
69 mov_i32 r1,tmp6 sync: 0 dead: 0 1
70 goto_tb $0x1
71 movi_i32 pc,$0x60000008 sync: 0 dead: 0
72 exit_tb $0x7f8e8ef58101
73 set_label $L0
74 exit_tb $0x7f8e8ef58103
75
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next reply other threads:[~2020-07-29 14:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-29 14:27 tugouxp [this message]
2020-07-29 16:16 ` What this mean "dead: 1" and "dead: 0 1" on each tb block start? Richard Henderson
2020-07-30 5:54 ` tugouxp
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