diff options
| author | Alan Wu <XrXr@users.noreply.github.com> | 2022-07-22 16:24:18 -0400 |
|---|---|---|
| committer | Takashi Kokubun <takashikkbn@gmail.com> | 2022-08-29 08:47:04 -0700 |
| commit | 813df1f27aa52a3050d90dab23bc72093da00e6c (patch) | |
| tree | 2a514fc12e2a224208eb43e4d080e8bdad802d39 /yjit/src/backend/x86_64 | |
| parent | 133ad38777db991e20a1feba1acbfe5d97cc2fa0 (diff) | |
Add LiveReg IR instruction to fix stats leave exit code (https://github.com/Shopify/ruby/pull/341)
It allows for reserving a specific register and prevents the register
allocator from clobbering it. Without this
`./miniruby --yjit-stats --yjit-callthreshold=1 -e0` was crashing because
the counter incrementing code was clobbering RAX incorrectly.
Diffstat (limited to 'yjit/src/backend/x86_64')
| -rw-r--r-- | yjit/src/backend/x86_64/mod.rs | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/yjit/src/backend/x86_64/mod.rs b/yjit/src/backend/x86_64/mod.rs index 7b84e62134..5bae5c7f29 100644 --- a/yjit/src/backend/x86_64/mod.rs +++ b/yjit/src/backend/x86_64/mod.rs @@ -448,7 +448,8 @@ impl Assembler Op::CSelGE => { mov(cb, insn.out.into(), insn.opnds[0].into()); cmovl(cb, insn.out.into(), insn.opnds[1].into()); - }, + } + Op::LiveReg => (), // just a reg alloc signal, no code // We want to keep the panic here because some instructions that // we feed to the backend could get lowered into other |