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Expose struct size threhold to allow users to tweak their own setting.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@38472 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2007-07-09 21:19:23 +00:00
parent 532dc2e1f2
commit ff366850aa
2 changed files with 13 additions and 4 deletions
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2
include/llvm/Transforms/Scalar.h
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@ -76,7 +76,7 @@ FunctionPass *createAggressiveDCEPass();
// ScalarReplAggregates - Break up alloca's of aggregates into multiple allocas
// if possible.
//
FunctionPass *createScalarReplAggregatesPass();
FunctionPass *createScalarReplAggregatesPass(signed Threshold = -1);
//===----------------------------------------------------------------------===//
//

15
lib/Transforms/Scalar/ScalarReplAggregates.cpp
View File

@ -48,7 +48,12 @@ STATISTIC(NumGlobals, "Number of allocas copied from constant global");
namespace {
struct VISIBILITY_HIDDEN SROA : public FunctionPass {
static char ID; // Pass identification, replacement for typeid
SROA() : FunctionPass((intptr_t)&ID) {}
SROA(signed T = -1) : FunctionPass((intptr_t)&ID) {
if (T == -1)
SRThreshold = 128;
else
SRThreshold = T;
}
bool runOnFunction(Function &F);
@ -87,6 +92,8 @@ namespace {
isMemCpySrc(false), isMemCpyDst(false) {}
};
unsigned SRThreshold;
void MarkUnsafe(AllocaInfo &I) { I.isUnsafe = true; }
int isSafeAllocaToScalarRepl(AllocationInst *AI);
@ -119,7 +126,9 @@ namespace {
}
// Public interface to the ScalarReplAggregates pass
FunctionPass *llvm::createScalarReplAggregatesPass() { return new SROA(); }
FunctionPass *llvm::createScalarReplAggregatesPass(signed int Threshold) {
return new SROA(Threshold);
}
bool SROA::runOnFunction(Function &F) {
@ -211,7 +220,7 @@ bool SROA::performScalarRepl(Function &F) {
(isa<StructType>(AI->getAllocatedType()) ||
isa<ArrayType>(AI->getAllocatedType())) &&
AI->getAllocatedType()->isSized() &&
TD.getTypeSize(AI->getAllocatedType()) < 128) {
TD.getTypeSize(AI->getAllocatedType()) < SRThreshold) {
// Check that all of the users of the allocation are capable of being
// transformed.
switch (isSafeAllocaToScalarRepl(AI)) {