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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47888 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2008-03-04 17:44:37 +00:00
parent e6074a027f
commit 98a6e067df
1 changed files with 11 additions and 5 deletions
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16
lib/Transforms/IPO/StructRetPromotion.cpp
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@@ -24,9 +24,12 @@
#include "llvm/Support/Debug.h" #include "llvm/Support/Debug.h"
#include "llvm/ADT/Statistic.h" #include "llvm/ADT/Statistic.h"
#include "llvm/ADT/SmallVector.h" #include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/Compiler.h" #include "llvm/Support/Compiler.h"
using namespace llvm; using namespace llvm;
STATISTIC(NumRejectedSRETUses , "Number of sret rejected due to unexpected uses");
STATISTIC(NumSRET , "Number of sret promoted");
namespace { namespace {
/// SRETPromotion - This pass removes sret parameter and updates /// SRETPromotion - This pass removes sret parameter and updates
/// function to use multiple return value. /// function to use multiple return value.
@@ -87,15 +90,18 @@ bool SRETPromotion::PromoteReturn(CallGraphNode *CGN) {
assert (STy && "Invalid sret parameter element type"); assert (STy && "Invalid sret parameter element type");
// Check if it is ok to perform this promotion. // Check if it is ok to perform this promotion.
if (isSafeToUpdateAllCallers(F) == false) if (isSafeToUpdateAllCallers(F) == false) {
NumRejectedSRETUses++;
return false; return false;
}
// [1] Replace use of sret parameter // [1] Replace use of sret parameter
AllocaInst *TheAlloca = new AllocaInst (STy, NULL, "mrv", F->getEntryBlock().begin()); AllocaInst *TheAlloca = new AllocaInst (STy, NULL, "mrv",
F->getEntryBlock().begin());
Value *NFirstArg = F->arg_begin(); Value *NFirstArg = F->arg_begin();
NFirstArg->replaceAllUsesWith(TheAlloca); NFirstArg->replaceAllUsesWith(TheAlloca);
// Find and replace ret instructions // [2] Find and replace ret instructions
SmallVector<Value *,4> RetVals; SmallVector<Value *,4> RetVals;
for (Function::iterator FI = F->begin(), FE = F->end(); FI != FE; ++FI) for (Function::iterator FI = F->begin(), FE = F->end(); FI != FE; ++FI)
for(BasicBlock::iterator BI = FI->begin(), BE = FI->end(); BI != BE; ) { for(BasicBlock::iterator BI = FI->begin(), BE = FI->end(); BI != BE; ) {
@@ -119,10 +125,10 @@ bool SRETPromotion::PromoteReturn(CallGraphNode *CGN) {
} }
} }
// Create the new function body and insert it into the module. // [3] Create the new function body and insert it into the module.
Function *NF = cloneFunctionBody(F, STy); Function *NF = cloneFunctionBody(F, STy);
// Update all call sites to use new function // [4] Update all call sites to use new function
updateCallSites(F, NF); updateCallSites(F, NF);
F->eraseFromParent(); F->eraseFromParent();