derek.holloway
7502bf64a4
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62 lines
1.6 KiB
LLVM
62 lines
1.6 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 [2 x ptr] [ptr @vf1a, ptr @vf1b], !type !0
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@vt2 = constant [2 x ptr] [ptr @vf2a, ptr @vf2b], !type !0
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@sink = external global i32
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define i32 @vf1a(ptr %this, i32 %arg) {
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store i32 %arg, ptr @sink
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ret i32 %arg
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}
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define i32 @vf2a(ptr %this, i32 %arg) {
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store i32 %arg, ptr @sink
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ret i32 %arg
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}
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define i32 @vf1b(ptr %this, i32 %arg) {
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ret i32 %arg
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}
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define i32 @vf2b(ptr %this, i32 %arg) {
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ret i32 %arg
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}
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; Test that we don't apply VCP if the virtual function body accesses memory,
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; even if the function returns a constant.
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; CHECK: define i32 @call1
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define i32 @call1(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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%fptr = load ptr, ptr %vtable
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; CHECK: call i32 %
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%result = call i32 %fptr(ptr %obj, i32 1)
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ret i32 %result
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}
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; Test that we can apply VCP regardless of the function attributes by analyzing
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; the function body itself.
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; CHECK: define i32 @call2
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define i32 @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 !"typeid")
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call void @llvm.assume(i1 %p)
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%fptrptr = getelementptr [1 x ptr], ptr %vtable, i32 0, i32 1
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%fptr = load ptr, ptr %fptrptr
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%result = call i32 %fptr(ptr %obj, i32 1)
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; CHECK: ret i32 1
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ret i32 %result
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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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