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Stop using a callee-saved register for scratch0 on aarch64 (#6312)

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[Bug #18985]

* Callee-save x22 for aarch64

* Just use a caller-saved register

* Update yjit/src/backend/arm64/mod.rs

Co-authored-by: Alan Wu <alansi.xingwu@shopify.com>
Co-authored-by: Maxime Chevalier-Boisvert <maximechevalierb@gmail.com>
This commit is contained in:
Takashi Kokubun 2022-09-01 13:38:38 -07:00 • committed by GitHub
parent 419118473e
commit 064944c902
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Notes: git 2022-09-02 05:39:04 +09:00 
Merged-By: k0kubun <takashikkbn@gmail.com>
1 changed files with 2 additions and 1 deletions
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3
yjit/src/backend/arm64/mod.rs
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@ -69,7 +69,8 @@ impl From<&Opnd> for A64Opnd {
impl Assembler
{
// A special scratch register for intermediate processing.
const SCRATCH0: A64Opnd = A64Opnd::Reg(X22_REG);
// This register is caller-saved (so we don't have to save it before using it)
const SCRATCH0: A64Opnd = A64Opnd::Reg(X15_REG);
/// Get the list of registers from which we will allocate on this platform
/// These are caller-saved registers