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Tied operands with different size #9

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bjorn3 opened this issue Jan 8, 2020 · 1 comment
Closed

Tied operands with different size #9

bjorn3 opened this issue Jan 8, 2020 · 1 comment

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@bjorn3
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bjorn3 commented Jan 8, 2020

In https://immunant.com/blog/2020/01/quake3/ it was noted at the "Tied Operands in Inline Assembly" section that gcc and clang use the biggest of the operands as register size and then truncates when necessary. LLVM however leaves this undefined.
@Amanieu
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Amanieu commented Jan 8, 2020

This is already covered in the draft RFC:

If an inout is used where the output type is smaller than the input type then some special handling is needed to avoid LLVM issues. See this bug.

@bjorn3 bjorn3 closed this as completed Jan 8, 2020
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@Amanieu @bjorn3