[LLVMbugs] [Bug 11810] New: Inline asm: "undef" rejected for 'i' constraint

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11810

             Bug #: 11810
           Summary: Inline asm: "undef" rejected for 'i' constraint
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: baldrick at free.fr
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


On the following testcase llc outputs:
  error: invalid operand for inline asm constraint 'i'
It accepts the asm if "undef" is replaced by "0".  I think undef should be
accepted.

target datalayout =
"e-p:64:64:64-S128-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f16:16:16-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-f128:128:128-n8:16:32:64"
target triple = "x86_64--linux-gnu"

define void @foo() {
entry:
  call void asm "# bar on $0", "i,~{fpsr},~{flags}"(i32 undef) nounwind
  ret void
}

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