https://llvm.org/bugs/show_bug.cgi?id=30717
Bug ID: 30717
Summary: Exhange instruction uses two different sized registers
Product: libraries
Version: 3.9
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: nholc...@wisc.edu
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
When the 0x66 prefix is present, two differently sized registers are used by
the decoded xchg instruction. Here's an example decoded with LLVM:
Bytes: 66 94
Output: xchgl %sp, %eax
The second operand should be %ax.
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