[LLVMbugs] [Bug 3074] New: ConstantInt::get takes an "isSigned" parameter?

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sat Nov 15 21:05:30 PST 2008


           Summary: ConstantInt::get takes an "isSigned" parameter?
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Core LLVM classes
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nicholas at mxc.ca
                CC: llvmbugs at cs.uiuc.edu

ConstantInt::get takes an isSigned parameter. Which is pretty amazing because
ConstantInts don't carry a sign. What it does with it, is pass it through to
the APInt constructor. Which is pretty amazing, because APInts don't carry a

The APInt constructor has two cases, one in which the entire value fits in a
int64_t. In the other case, it calls initSlowCase, which takes isSigned and
uses that to clear the memory space to all 0 bits or all 1 bits depending on
whether it's signed or unsigned.

You want to know what else is amazing? If you hard-code the isSigned parameter
to initSlowCase to false, make check fails.

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