[LLVMbugs] [Bug 16491] New: Half precision floating point types broken on X86

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sat Jun 29 10:20:59 PDT 2013


            Bug ID: 16491
           Summary: Half precision floating point types broken on X86
           Product: libraries
           Version: 3.2
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: kfischer at college.harvard.edu
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 10795
  --> http://llvm.org/bugs/attachment.cgi?id=10795&action=edit
Backtrace/output from LLC

Running the following in llc ends with an LLVM assertion failure:

define void @foo () {
    %1 = alloca half
    store half 0xH42CC, half* %1   ; 0xH42CC = 3.4
    %2 = load half* %1
    ret void

(credit to Alessio Giovanni Baroni on the LLVM mailing list for the example).

I attached backtrace/output from llc. This happens on both 3.2 and 3.3.

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