derek.holloway
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57 lines
2.2 KiB
LLVM
57 lines
2.2 KiB
LLVM
; RUN: opt -S -passes=wholeprogramdevirt -whole-program-visibility %s | FileCheck %s
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; This test is reduced from C++ code like this:
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; class A :public std::exception {
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; public:
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; A() {};
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; const char* what () const throw () {return "A";}
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; };
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; long test(std::exception *p) {
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; const char* ch = p->what();
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; ...;
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; }
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;
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; Build command is "clang++ -O2 -target x86_64-unknown-linux -flto=full \
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; -fwhole-program-vtables -static-libstdc++ -Wl,-plugin-opt=-whole-program-visibility"
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;
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; _ZTVSt9exception's visibility is 1 (Linkage Unit), and available_externally.
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; If any GV is available_externally, icall.branch.funnel should not be generated.
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux"
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@_ZTVSt9exception = available_externally constant { [5 x ptr] } { [5 x ptr] [ptr null, ptr null, ptr null, ptr null, ptr @_ZNKSt9exception4whatEv] }, !type !0, !type !1
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@_ZTV1A.0 = constant [5 x ptr] [ptr null, ptr null, ptr null, ptr null, ptr @_ZNK1A4whatEv], !type !3, !type !4, !type !5, !type !6
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declare ptr @_ZNKSt9exception4whatEv()
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define ptr @_Z4testPSt9exception() {
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%1 = load ptr, ptr null, align 8
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%2 = call i1 @llvm.type.test(ptr %1, metadata !"_ZTSSt9exception")
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tail call void @llvm.assume(i1 %2)
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%3 = getelementptr i8, ptr %1, i64 16
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%4 = load ptr, ptr %3, align 8
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%5 = tail call ptr %4(ptr null)
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ret ptr %5
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}
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; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write)
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declare void @llvm.assume(i1 noundef) #0
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declare ptr @_ZNK1A4whatEv()
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; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
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declare i1 @llvm.type.test(ptr, metadata) #1
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; CHECK-NOT: call void (...) @llvm.icall.branch.funnel
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attributes #0 = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write) }
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attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
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!0 = !{i64 16, !"_ZTSSt9exception"}
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!1 = !{i64 32, !"_ZTSMSt9exceptionKDoFPKcvE.virtual"}
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!3 = !{i32 16, !"_ZTS1A"}
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!4 = !{i32 32, !"_ZTSM1AKDoFPKcvE.virtual"}
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!5 = !{i32 16, !"_ZTSSt9exception"}
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!6 = !{i32 32, !"_ZTSMSt9exceptionKDoFPKcvE.virtual"}
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