http://llvm.org/bugs/show_bug.cgi?id=18975
Bug ID: 18975
Summary: Missing Uses/Defs information for x86 short MOV
instructions
Product: new-bugs
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 12152
--> http://llvm.org/bugs/attachment.cgi?id=12152&action=edit
proposed patch
While using LLVM to determine register usage of a dissassembled binary I
noticed
that some MOVs to/from EAX are not listing EAX as an (implicit) used/defined
register.
I think this is the cause:
The shorter instructions for MOVs to/from (E)AX optimized by
SimplifyShortMoveForm (X86MCInstLower.cpp) are missing register Uses and Defs
information in X86InstrInfo.td.
I attached a small patch which achieves expected behaviour in my build, but I'm
not familiar with tablegen.
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