forked from OSchip/llvm-project
70 lines
2.1 KiB
LLVM
70 lines
2.1 KiB
LLVM
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; RUN: opt -S -wholeprogramdevirt %s | FileCheck %s
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; RUN: opt -S -passes=wholeprogramdevirt %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 i8*] [i8* bitcast (i32 (i8*, i32)* @vf1a to i8*), i8* bitcast (i32 (i8*, i32)* @vf1b to i8*)], !type !0
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@vt2 = constant [2 x i8*] [i8* bitcast (i32 (i8*, i32)* @vf2a to i8*), i8* bitcast (i32 (i8*, i32)* @vf2b to i8*)], !type !0
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@sink = external global i32
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define i32 @vf1a(i8* %this, i32 %arg) {
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store i32 %arg, i32* @sink
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ret i32 %arg
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}
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define i32 @vf2a(i8* %this, i32 %arg) {
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store i32 %arg, i32* @sink
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ret i32 %arg
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}
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define i32 @vf1b(i8* %this, i32 %arg) {
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ret i32 %arg
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}
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define i32 @vf2b(i8* %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(i8* %obj) {
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%vtableptr = bitcast i8* %obj to [1 x i8*]**
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%vtable = load [1 x i8*]*, [1 x i8*]** %vtableptr
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%vtablei8 = bitcast [1 x i8*]* %vtable to i8*
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%p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"typeid")
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call void @llvm.assume(i1 %p)
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%fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 0
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%fptr = load i8*, i8** %fptrptr
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%fptr_casted = bitcast i8* %fptr to i32 (i8*, i32)*
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; CHECK: call i32 %
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%result = call i32 %fptr_casted(i8* %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(i8* %obj) {
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%vtableptr = bitcast i8* %obj to [1 x i8*]**
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%vtable = load [1 x i8*]*, [1 x i8*]** %vtableptr
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%vtablei8 = bitcast [1 x i8*]* %vtable to i8*
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%p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"typeid")
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call void @llvm.assume(i1 %p)
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%fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 1
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%fptr = load i8*, i8** %fptrptr
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%fptr_casted = bitcast i8* %fptr to i32 (i8*, i32)*
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%result = call i32 %fptr_casted(i8* %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(i8*, metadata)
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declare void @llvm.assume(i1)
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!0 = !{i32 0, !"typeid"}
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