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LowerBitSets: do not use private aliases at all on Darwin.

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LLVM currently turns these into linker-private symbols, which can be dead
stripped by the Darwin linker.

llvm-svn: 232435
This commit is contained in:
Peter Collingbourne 2015-03-16 23:36:24 +00:00
parent f2d8674c1f
commit cf293cd018
2 changed files with 31 additions and 16 deletions
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29
lib/Transforms/IPO/LowerBitSets.cpp
View File

@ -349,9 +349,13 @@ void LowerBitSets::allocateByteArrays() {
// Create an alias instead of RAUW'ing the gep directly. On x86 this ensures
// that the pc-relative displacement is folded into the lea instead of the
// test instruction getting another displacement.
GlobalAlias *Alias = GlobalAlias::create(
Int8Ty, 0, GlobalValue::PrivateLinkage, "bits", GEP, M);
BAI->ByteArray->replaceAllUsesWith(Alias);
if (LinkerSubsectionsViaSymbols) {
BAI->ByteArray->replaceAllUsesWith(GEP);
} else {
GlobalAlias *Alias = GlobalAlias::create(
Int8Ty, 0, GlobalValue::PrivateLinkage, "bits", GEP, M);
BAI->ByteArray->replaceAllUsesWith(Alias);
}
BAI->ByteArray->eraseFromParent();
}
@ -529,15 +533,16 @@ void LowerBitSets::buildBitSetsFromGlobals(
ConstantInt::get(Int32Ty, I * 2)};
Constant *CombinedGlobalElemPtr =
ConstantExpr::getGetElementPtr(CombinedGlobal, CombinedGlobalIdxs);
GlobalValue::LinkageTypes GAliasLinkage = LinkerSubsectionsViaSymbols
? GlobalValue::PrivateLinkage
: Globals[I]->getLinkage();
GlobalAlias *GAlias = GlobalAlias::create(
Globals[I]->getType()->getElementType(),
Globals[I]->getType()->getAddressSpace(), GAliasLinkage,
"", CombinedGlobalElemPtr, M);
GAlias->takeName(Globals[I]);
Globals[I]->replaceAllUsesWith(GAlias);
if (LinkerSubsectionsViaSymbols) {
Globals[I]->replaceAllUsesWith(CombinedGlobalElemPtr);
} else {
GlobalAlias *GAlias = GlobalAlias::create(
Globals[I]->getType()->getElementType(),
Globals[I]->getType()->getAddressSpace(), Globals[I]->getLinkage(),
"", CombinedGlobalElemPtr, M);
GAlias->takeName(Globals[I]);
Globals[I]->replaceAllUsesWith(GAlias);
}
Globals[I]->eraseFromParent();
}
}

18
test/Transforms/LowerBitSets/simple.ll
View File

@ -42,10 +42,20 @@ target datalayout = "e-p:32:32"
; CHECK: @b = alias getelementptr inbounds ({ i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }, { i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }* [[G]], i32 0, i32 2)
; CHECK: @c = alias getelementptr inbounds ({ i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }, { i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }* [[G]], i32 0, i32 4)
; CHECK: @d = alias getelementptr inbounds ({ i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }, { i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }* [[G]], i32 0, i32 6)
; CHECK-DARWIN: @a = private alias
; CHECK-DARWIN: @b = private alias
; CHECK-DARWIN: @c = private alias
; CHECK-DARWIN: @d = private alias
; CHECK-DARWIN: @aptr = constant i32* getelementptr inbounds ({ i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }, { i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }* [[G:@[^ ]*]], i32 0, i32 0)
@aptr = constant i32* @a
; CHECK-DARWIN: @bptr = constant [63 x i32]* getelementptr inbounds ({ i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }, { i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }* [[G]], i32 0, i32 2)
@bptr = constant [63 x i32]* @b
; CHECK-DARWIN: @cptr = constant i32* getelementptr inbounds ({ i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }, { i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }* [[G]], i32 0, i32 4)
@cptr = constant i32* @c
; CHECK-DARWIN: @dptr = constant [2 x i32]* getelementptr inbounds ({ i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }, { i32, [0 x i8], [63 x i32], [4 x i8], i32, [0 x i8], [2 x i32] }* [[G]], i32 0, i32 6)
@dptr = constant [2 x i32]* @d
; CHECK-DARWIN: [[G]] = private constant
; CHECK: @bits = private alias getelementptr inbounds ([68 x i8], [68 x i8]* [[BA]], i32 0, i32 0)
; CHECK: @bits1 = private alias getelementptr inbounds ([68 x i8], [68 x i8]* [[BA]], i32 0, i32 0)