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[PowerPC] support inline asm Y constraint #92939

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nickdesaulniers opened this issue May 21, 2024 · 2 comments
Open

[PowerPC] support inline asm Y constraint #92939

nickdesaulniers opened this issue May 21, 2024 · 2 comments
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backend:PowerPC inline-asm

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@nickdesaulniers
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The PPC port of the Linux kernel is looking to use an undocumented constraint Y in inline asm.

https://lore.kernel.org/linuxppc-dev/[email protected]/

We should add support for this to LLVM.
@llvmbot
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llvmbot commented May 21, 2024

@llvm/issue-subscribers-backend-powerpc

Author: Nick Desaulniers (paternity leave) (nickdesaulniers)

The PPC port of the Linux kernel is looking to use an undocumented constraint `Y` in inline asm.

https://lore.kernel.org/linuxppc-dev/20240521123919.245886-1-mpe@ellerman.id.au/

We should add support for this to LLVM.

@nickdesaulniers nickdesaulniers mentioned this issue May 21, 2024
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@chenzheng1030
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chenzheng1030 commented May 27, 2024 •
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Where can I get an explanation for constraint Y? Is Y a PPC specific constraint. I can not find it in GCC manual or IBM XLC manual. Thanks.

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