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Summary: Chrome on Linux uses WholeProgramDevirt for speed ups, and it's important to detect regressions on both sides: the toolchain, if fewer methods get devirtualized after an update, and Chrome, if an innocently looking change caused many hot methods become virtual again. The need to track devirtualized methods is not Chrome-specific, but it's probably the only user of the pass at this time. Reviewers: kcc Differential Revision: https://reviews.llvm.org/D23219 llvm-svn: 277856
36 lines
1.1 KiB
LLVM
36 lines
1.1 KiB
LLVM
; RUN: opt -S -wholeprogramdevirt -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: devirtualized call
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; CHECK: remark: <unknown>:0:0: devirtualized vf
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; CHECK: remark: <unknown>:0:0: devirtualized vf
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@vt1 = constant [1 x i8*] [i8* bitcast (void (i8*)* @vf to i8*)], !type !0
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@vt2 = constant [1 x i8*] [i8* bitcast (void (i8*)* @vf to i8*)], !type !0
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define void @vf(i8* %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(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 void (i8*)*
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; CHECK: call void @vf(
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call void %fptr_casted(i8* %obj)
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ret void
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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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