[LLVMbugs] [Bug 2801] New: x86-64 doesn't save nonvolatile XMM6-XMM15 registers

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Wed Sep 17 03:33:14 PDT 2008


           Summary: x86-64 doesn't save nonvolatile XMM6-XMM15 registers
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nicolas at capens.net
                CC: llvmbugs at cs.uiuc.edu

The x86-64 ABI specifies that XMM6 to XMM15 are non-volatile, and should be
preserved by the callee as needed. It appears that LLVM currently doesn't do
this, causing unpredictable behavior with floating-point calculations.

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