[llvm-bugs] [Bug 24851] New: -inline will not inline a trivial function containing only unreachable

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=24851

            Bug ID: 24851
           Summary: -inline will not inline a trivial function containing
                    only unreachable
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Interprocedural Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: david.majnemer at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

consider:
$ cat t.ll
define void @f() {
entry:
  tail call void @g()
  unreachable
}

define void @g() {
entry:
  unreachable
}

$ opt -inline t.ll -S -debug
Inliner visiting SCC: g: 0 call sites.
Inliner visiting SCC: f: 1 call sites.
      Analyzing call of g...
      NumConstantArgs: 0
      NumConstantOffsetPtrArgs: 0
      NumAllocaArgs: 0
      NumConstantPtrCmps: 0
      NumConstantPtrDiffs: 0
      NumInstructionsSimplified: 1
      NumInstructions: 1
      SROACostSavings: 0
      SROACostSavingsLost: 0
      ContainsNoDuplicateCall: 0
      Cost: 0
      Threshold: -337
    NOT Inlining: cost=0, thres=-337, Call:   tail call void @g()
Inliner visiting SCC: INDIRECTNODE: 0 call sites.
; ModuleID = 't.ll'

define void @f() {
entry:
  tail call void @g()
  unreachable
}

define void @g() {
entry:
  unreachable
}

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