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For PR21145: recognise a builtin call to a known deallocation function even if 

it's defined in the current module. Clang generates this situation for the
C++14 sized deallocation functions, because it generates a weak definition in
case one isn't provided by the C++ runtime library.

llvm-svn: 226069
This commit is contained in:
Richard Smith 2015-01-15 01:00:33 +00:00
parent a487aa4cdb
commit e78bb1249e
2 changed files with 24 additions and 5 deletions
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2
llvm/lib/Analysis/MemoryBuiltins.cpp
View File

@ -319,7 +319,7 @@ const CallInst *llvm::isFreeCall(const Value *I, const TargetLibraryInfo *TLI) {
if (!CI || isa<IntrinsicInst>(CI))
return nullptr;
Function *Callee = CI->getCalledFunction();
if (Callee == nullptr || !Callee->isDeclaration())
if (Callee == nullptr)
return nullptr;
StringRef FnName = Callee->getName();

27
llvm/test/Transforms/InstCombine/malloc-free-delete.ll
View File

@ -146,17 +146,36 @@ lpad.i: ; preds = %entry
}
declare i8* @_Znwm(i64) nobuiltin
declare void @_ZdlPvm(i8*, i64) nobuiltin
declare i8* @_Znwj(i32) nobuiltin
declare void @_ZdlPvj(i8*, i32) nobuiltin
declare i8* @_Znam(i64) nobuiltin
declare void @_ZdaPvm(i8*, i64) nobuiltin
declare i8* @_Znaj(i32) nobuiltin
declare void @_ZdaPvj(i8*, i32) nobuiltin
declare void @_ZdlPv(i8*) nobuiltin
declare void @_ZdaPv(i8*) nobuiltin
define linkonce void @_ZdlPvm(i8* %p, i64) nobuiltin {
call void @_ZdlPv(i8* %p)
ret void
}
define linkonce void @_ZdlPvj(i8* %p, i32) nobuiltin {
call void @_ZdlPv(i8* %p)
ret void
}
define linkonce void @_ZdaPvm(i8* %p, i64) nobuiltin {
call void @_ZdaPv(i8* %p)
ret void
}
define linkonce void @_ZdaPvj(i8* %p, i32) nobuiltin {
call void @_ZdaPv(i8* %p)
ret void
}
; CHECK-LABEL: @test8(
define void @test8() {
; CHECK-NOT: call
%nw = call i8* @_Znwm(i64 32) builtin
call void @_ZdlPv(i8* %nw) builtin
%na = call i8* @_Znam(i64 32) builtin
call void @_ZdaPv(i8* %na) builtin
%nwm = call i8* @_Znwm(i64 32) builtin
call void @_ZdlPvm(i8* %nwm, i64 32) builtin
%nwj = call i8* @_Znwj(i32 32) builtin