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Move the memory fences out of the path for single-threaded mode.

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llvm-svn: 73775
This commit is contained in:
Owen Anderson 2009-06-19 17:45:12 +00:00
parent d920fdb643
commit 12e12ed0d4
2 changed files with 15 additions and 14 deletions
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11
lib/VMCore/Pass.cpp
View File

@ -198,9 +198,9 @@ static PassRegistrar *getPassRegistrar() {
// Use double-checked locking to safely initialize the registrar when
// we're running in multithreaded mode.
PassRegistrar* tmp = PassRegistrarObj;
sys::MemoryFence();
if (!tmp) {
if (llvm_is_multithreaded()) {
if (llvm_is_multithreaded()) {
sys::MemoryFence();
if (!tmp) {
llvm_acquire_global_lock();
tmp = PassRegistrarObj;
if (!tmp) {
@ -209,10 +209,11 @@ static PassRegistrar *getPassRegistrar() {
PassRegistrarObj = tmp;
}
llvm_release_global_lock();
} else {
PassRegistrarObj = new PassRegistrar();
}
} else if (!tmp) {
PassRegistrarObj = new PassRegistrar();
}
return PassRegistrarObj;
}

18
lib/VMCore/Type.cpp
View File

@ -458,9 +458,9 @@ void DerivedType::dropAllTypeUses() {
static Type *AlwaysOpaqueTy = 0;
static PATypeHolder* Holder = 0;
Type *tmp = AlwaysOpaqueTy;
sys::MemoryFence();
if (!tmp) {
if (llvm_is_multithreaded()) {
if (llvm_is_multithreaded()) {
sys::MemoryFence();
if (!tmp) {
llvm_acquire_global_lock();
tmp = AlwaysOpaqueTy;
if (!tmp) {
@ -472,12 +472,12 @@ void DerivedType::dropAllTypeUses() {
}
llvm_release_global_lock();
} else {
AlwaysOpaqueTy = OpaqueType::get();
Holder = new PATypeHolder(AlwaysOpaqueTy);
}
}
}
} else {
AlwaysOpaqueTy = OpaqueType::get();
Holder = new PATypeHolder(AlwaysOpaqueTy);
}
ContainedTys[0] = AlwaysOpaqueTy;
// Change the rest of the types to be Int32Ty's. It doesn't matter what we