http://llvm.org/bugs/show_bug.cgi?id=3225
Summary: Wrong code legalizing 64-bit shift on x86
Product: new-bugs
Version: unspecified
Platform: PC
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=2310)
--> (http://llvm.org/bugs/attachment.cgi?id=2310)
Testcase
Testcase attached; should print out "4294967295" when run, but currently prints
out "-1" on x86.
Roughly, the issue is that DAGTypeLegalizer::
ExpandShiftWithKnownAmountBit is generating an undefined shift. This issue is
often not visible on x86 because it requires a shift by zero, and shldl hides
the issue; however, a carefully crafted testcase like the attached shows the
issue.
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