48 lines
1.5 KiB
LLVM
48 lines
1.5 KiB
LLVM
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; RUN: opt -S -passes=wholeprogramdevirt -whole-program-visibility -pass-remarks=wholeprogramdevirt %s 2>&1 | FileCheck %s
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target datalayout = "e-p:64:64"
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target triple = "x86_64-unknown-linux-gnu"
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; CHECK: remark: <unknown>:0:0: single-impl: devirtualized a call to vf
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; CHECK: remark: <unknown>:0:0: devirtualized vf
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; CHECK-NOT: devirtualized
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; A vtable with "relative pointers", slots don't contain pointers to implementations, but instead have an i32 offset from the vtable itself to the implementation.
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@vtable = internal unnamed_addr constant { [2 x i32] } { [2 x i32] [
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i32 trunc (i64 sub (i64 ptrtoint (ptr @vfunc1_live to i64), i64 ptrtoint (ptr @vtable to i64)) to i32),
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i32 trunc (i64 sub (i64 ptrtoint (ptr @vfunc2_dead to i64), i64 ptrtoint (ptr @vtable to i64)) to i32)
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]}, align 8, !type !0, !type !1
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;, !vcall_visibility !{i64 2}
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!0 = !{i64 0, !"vfunc1.type"}
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!1 = !{i64 4, !"vfunc2.type"}
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define internal void @vfunc1_live() {
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ret void
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}
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define internal void @vfunc2_dead() {
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ret void
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}
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; CHECK: define void @call
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define void @call(ptr %obj) {
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%vtable = load ptr, ptr %obj
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%pair = call {ptr, i1} @llvm.type.checked.load.relative(ptr %vtable, i32 0, metadata !"vfunc1.type")
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%fptr = extractvalue {ptr, i1} %pair, 0
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%p = extractvalue {ptr, i1} %pair, 1
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; CHECK: br i1 true,
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br i1 %p, label %cont, label %trap
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cont:
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; CHECK: call void @vfunc1_live(
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call void %fptr()
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ret void
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trap:
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call void @llvm.trap()
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unreachable
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}
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declare {ptr, i1} @llvm.type.checked.load.relative(ptr, i32, metadata)
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declare void @llvm.trap()
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