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

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merged 3 commits into from Sep 1, 2022
Merged

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

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679d85b
Callee-save x22 for aarch64
k0kubun Sep 1, 2022
2e695c8
Just use a caller-saved register
k0kubun Sep 1, 2022
ae9b5c9
Update yjit/src/backend/arm64/mod.rs
k0kubun Sep 1, 2022
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3 changes: 2 additions & 1 deletion yjit/src/backend/arm64/mod.rs
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Expand Up @@ -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);
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/// Get the list of registers from which we will allocate on this platform
/// These are caller-saved registers
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