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Handle calls and invokes in GlobalStatus.

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This patch teaches GlobalStatus to analyze a call that uses the global value as
a callee, not as an argument.

With this change internalize call handle the common use of linkonce_odr
functions. This reduces the number of linkonce_odr functions in a LTO build of
clang (checked with the emit-llvm gold plugin option) from 1730 to 60.

llvm-svn: 193436
This commit is contained in:
Rafael Espindola 2013-10-25 21:29:52 +00:00
parent d554c99b37
commit 37e88054ad
2 changed files with 42 additions and 0 deletions
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5
lib/Transforms/Utils/GlobalStatus.cpp
View File

@ -11,6 +11,7 @@
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Transforms/Utils/GlobalStatus.h"
using namespace llvm;
@ -148,6 +149,10 @@ static bool analyzeGlobalAux(const Value *V, GlobalStatus &GS,
if (MSI->isVolatile())
return true;
GS.StoredType = GlobalStatus::Stored;
} else if (ImmutableCallSite C = I) {
if (!C.isCallee(UI))
return true;
GS.IsLoaded = true;
} else {
return true; // Any other non-load instruction might take address!
}

37
test/Transforms/Internalize/linkonce_odr_func.ll Normal file
View File

@ -0,0 +1,37 @@
; RUN: opt < %s -internalize -internalize-dso-list foo1,foo2,foo3,foo4 -S | FileCheck %s
; CHECK: define internal void @foo1(
define linkonce_odr void @foo1() noinline {
ret void
}
; CHECK: define linkonce_odr void @foo2(
define linkonce_odr void @foo2() noinline {
ret void
}
; CHECK: define internal void @foo3(
define linkonce_odr void @foo3() noinline {
ret void
}
; CHECK: define linkonce_odr void @foo4(
define linkonce_odr void @foo4() noinline {
ret void
}
declare void @f(void()*)
define void @bar() {
bb0:
call void @foo1()
call void @f(void()* @foo2)
invoke void @foo3() to label %bb1 unwind label %clean
bb1:
invoke void @f(void()* @foo4) to label %bb2 unwind label %clean
bb2:
ret void
clean:
landingpad i32 personality i8* null cleanup
ret void
}