wazevo(arm64): do not use x18 reserved by apple #1642
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Signed-off-by: Takeshi Yoneda <t.y.mathetake@gmail.com>
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interesting apparently this is |
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Cool. Luckily we are not using it in the current compiler as well, so we are secured 😄 |
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The wazevo tests have started failing somehow only from Go 1.21 on GOOS=dawrin,
and it turns out we used the reserved "do not use" register, x18 by Apple:
https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms#Respect-the-purpose-of-specific-CPU-registers
Since AArch64 has lots of GP regs, we conservatively stop using x18 for all platforms (incl. linux),
but that can be relaxed later.
#1496