58c5f50f4c
Also reapply "[llvm] Teach whole program devirtualization about relative vtables" This reverts commit 1c604a9780fcfe92a99d539913553f0835b81de3 and 474f5efebed24547e76d022f0c5ffcc9db97ce6f.
50 lines
1.4 KiB
LLVM
50 lines
1.4 KiB
LLVM
; RUN: opt -S -passes=wholeprogramdevirt -whole-program-visibility %s | 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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@vt1 = constant [1 x ptr] [ptr @vf], !type !0
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@vt2 = constant [1 x ptr] [ptr @vf], !type !0
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define void @vf(ptr %this) {
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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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%p = call i1 @llvm.type.test(ptr %vtable, metadata !"typeid")
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call void @llvm.assume(i1 %p)
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%p2 = call i1 @llvm.type.test(ptr %vtable, metadata !"typeid")
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call void @llvm.assume(i1 %p2)
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%fptr = load ptr, ptr %vtable
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; CHECK: call void @vf(
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call void %fptr(ptr %obj)
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ret void
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}
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declare ptr @llvm.load.relative.i32(ptr, i32)
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@vt3 = private unnamed_addr constant [1 x i32] [
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i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @vf to i64), i64 ptrtoint (ptr @vt3 to i64)) to i32)
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], align 4, !type !1
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; CHECK: define void @call2
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define void @call2(ptr %obj) {
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%vtable = load ptr, ptr %obj
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%p = call i1 @llvm.type.test(ptr %vtable, metadata !"typeid2")
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call void @llvm.assume(i1 %p)
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%p2 = call i1 @llvm.type.test(ptr %vtable, metadata !"typeid2")
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call void @llvm.assume(i1 %p2)
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%fptr = call ptr @llvm.load.relative.i32(ptr %vtable, i32 0)
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; CHECK: call void @vf(
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call void %fptr(ptr %obj)
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ret void
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}
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declare i1 @llvm.type.test(ptr, metadata)
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declare void @llvm.assume(i1)
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!0 = !{i32 0, !"typeid"}
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!1 = !{i32 0, !"typeid2"}
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