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Reduce alignment of SmallVector<T> to the required amount, rather than forcing 16-byte alignment. This fixes misaligned SmallVector accesses via ExtractValueInst's SmallVector data member.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162331 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Smith
2012-08-22 00:11:07 +00:00
parent 6871d1eceb
commit bc36393108
3 changed files with 72 additions and 109 deletions
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lib/Support/SmallVector.cpp
+3 -3
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@@ -16,14 +16,15 @@ using namespace llvm;
/// grow_pod - This is an implementation of the grow() method which only works
/// on POD-like datatypes and is out of line to reduce code duplication.
void SmallVectorBase::grow_pod(size_t MinSizeInBytes, size_t TSize) {
void SmallVectorBase::grow_pod(void *FirstEl, size_t MinSizeInBytes,
size_t TSize) {
size_t CurSizeBytes = size_in_bytes();
size_t NewCapacityInBytes = 2 * capacity_in_bytes() + TSize; // Always grow.
if (NewCapacityInBytes < MinSizeInBytes)
NewCapacityInBytes = MinSizeInBytes;
void *NewElts;
if (this->isSmall()) {
if (BeginX == FirstEl) {
NewElts = malloc(NewCapacityInBytes);
// Copy the elements over. No need to run dtors on PODs.
@@ -37,4 +38,3 @@ void SmallVectorBase::grow_pod(size_t MinSizeInBytes, size_t TSize) {
this->BeginX = NewElts;
this->CapacityX = (char*)this->BeginX + NewCapacityInBytes;
}