http://llvm.org/bugs/show_bug.cgi?id=16455
Bug ID: 16455
Summary: loop vectorizer miscompile (t10135 case from PR16431)
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 10767
--> http://llvm.org/bugs/attachment.cgi?id=10767&action=edit
bugpoint reduced test case and input file
The loop vectorizer miscompiles the attached input (there is an input text file
read by the program which demonstrates the problem). This is the t10135 case
from PR16431.
Specifically, if you run:
opt -loop-vectorize -mcpu=x86-64 bugpoint-passinput.ll
Then the resulting program outputs:
res = 3453
whereas compiling it without running the loop vectorizer, the resulting program
outputs:
res = 5321
Unfortunately, bugpoint crashes when attempting to further reduce the test case
:(
-- but at least it was able to isolate the relevant pass.
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