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For x86 targets, do not do sibling call optimization when materializing the callee's address would require a GOT relocation. We can still do tail calls to internal functions, hidden functions, and protected functions, because they do not require this kind of relocation. It is still possible to get GOT relocations when the user explicitly asks for it with musttail or -tailcallopt, both of which are supposed to guarantee TCO. Based on a patch by Chih-hung Hsieh. Reviewers: srhines, timmurray, danalbert, enh, void, nadav, rnk Subscribers: joerg, davidxl, llvm-commits Differential Revision: http://reviews.llvm.org/D9799 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238487 91177308-0d34-0410-b5e6-96231b3b80d8
74 lines
1.4 KiB
LLVM
74 lines
1.4 KiB
LLVM
; RUN: llc < %s -mtriple=i686-pc-linux-gnu -relocation-model=pic | FileCheck %s
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; While many of these could be tail called, we don't do it because it forces
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; early binding.
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declare void @external()
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define hidden void @tailcallee_hidden() {
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entry:
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ret void
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}
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define void @tailcall_hidden() {
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entry:
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tail call void @tailcallee_hidden()
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ret void
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}
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; CHECK: tailcall_hidden:
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; CHECK: jmp tailcallee_hidden
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define internal void @tailcallee_internal() {
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entry:
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ret void
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}
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define void @tailcall_internal() {
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entry:
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tail call void @tailcallee_internal()
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ret void
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}
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; CHECK: tailcall_internal:
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; CHECK: jmp tailcallee_internal
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define default void @tailcallee_default() {
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entry:
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ret void
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}
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define void @tailcall_default() {
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entry:
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tail call void @tailcallee_default()
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ret void
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}
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; CHECK: tailcall_default:
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; CHECK: calll tailcallee_default@PLT
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define void @tailcallee_default_implicit() {
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entry:
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ret void
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}
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define void @tailcall_default_implicit() {
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entry:
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tail call void @tailcallee_default_implicit()
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ret void
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}
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; CHECK: tailcall_default_implicit:
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; CHECK: calll tailcallee_default_implicit@PLT
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define void @tailcall_external() {
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tail call void @external()
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ret void
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}
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; CHECK: tailcall_external:
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; CHECK: calll external@PLT
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define void @musttail_external() {
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musttail call void @external()
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ret void
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}
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; CHECK: musttail_external:
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; CHECK: movl external@GOT
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; CHECK: jmpl
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