http://llvm.org/bugs/show_bug.cgi?id=2324
Summary: gvn non-local CSE miscompilation
Product: new-bugs
Version: unspecified
Platform: Other
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
Created an attachment (id=1645)
--> (http://llvm.org/bugs/attachment.cgi?id=1645)
testcase .ll
The recent gvn non-local CSE changes broke several tests from the
Ada testsuite. I reduced one down to the attached (but still large)
testcase. The visible problem is that gvn thinks that the two memcmp
calls have the same results and eliminates one, but this is bogus
because %var_ara_8 changes between the two calls.
Reproduce using:
opt -gvn
and observe the transformation of the memcpy calls.
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