http://llvm.org/bugs/show_bug.cgi?id=21184
Bug ID: 21184
Summary: x86 code generation miscompilation
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 13158
--> http://llvm.org/bugs/attachment.cgi?id=13158&action=edit
Program, that misbehaves under x86_64.
I have a input file, which is a small program, that prints out some data.
When running on x86_64, without optimizations it produces wrong output.
[karl@funbox bugpoint]$ clang -O0 write.ll -o test && ./test
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff 00 00 00
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff 1f 00 00 00
When using the interpreter it produces correct output.
[karl@funbox bugpoint]$ lli -force-interpreter write.ll
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff 0f 00 00 00
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff 1f 00 00 00
When run on a arm, it also produces correct output.
So I believe that the problem lies in x86 code generation.
Note that bugpoint does manage to reduce somewhat, but I believe the original
code is a better starting point for tracking down this issue.
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