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Incorrect assembly of "xchg %eax, %eax" on x86-64 #10717

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efriedma-quic opened this issue Jul 13, 2011 · 3 comments
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Incorrect assembly of "xchg %eax, %eax" on x86-64 #10717

efriedma-quic opened this issue Jul 13, 2011 · 3 comments
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@efriedma-quic
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Bugzilla Link 10345
Resolution FIXED
Resolved on Oct 06, 2011 10:17
Version unspecified
OS All
Blocks llvm/llvm-bugzilla-archive#10988
CC @topperc

Extended Description

$ echo "xchg %eax, %eax" | llvm-mc -show-encoding
xchgl %eax, %eax ## encoding: [0x90]

The correct encoding is "0x87 0xc0"; the given encoding, "0x90", is a nop.
@efriedma-quic
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assigned to @topperc

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topperc commented Oct 6, 2011

Fixed in r141274.

@bcardosolopes
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mentioned in issue llvm/llvm-bugzilla-archive#10988

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 3, 2021
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@bcardosolopes @topperc @efriedma-quic