6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-11-20 10:19:43 +00:00
Code Issues Projects Releases Wiki Activity

Switch CodeMetrics itself over to use TTI to determine if an instruction

Browse Source 
is free. The whole CodeMetrics API should probably be reworked more, but
this is enough to allow deleting the duplicate code there for computing
whether an instruction is free.

All of the passes using this have been updated to pull in TTI and hand
it to the CodeMetrics stuff. Further, a dead CodeMetrics API
(analyzeFunction) is nuked for lack of users.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173036 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
2013-01-21 13:04:33 +00:00
parent 6097e774fc
commit a5157e68d1
6 changed files with 29 additions and 95 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
lib/Transforms/Scalar/LoopUnrollPass.cpp
View File

@@ -17,6 +17,7 @@
#include "llvm/Analysis/CodeMetrics.h"
#include "llvm/Analysis/LoopPass.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/Support/CommandLine.h"
@@ -90,6 +91,7 @@ namespace {
AU.addPreservedID(LCSSAID);
AU.addRequired<ScalarEvolution>();
AU.addPreserved<ScalarEvolution>();
AU.addRequired<TargetTransformInfo>();
// FIXME: Loop unroll requires LCSSA. And LCSSA requires dom info.
// If loop unroll does not preserve dom info then LCSSA pass on next
// loop will receive invalid dom info.
@@ -101,6 +103,7 @@ namespace {
char LoopUnroll::ID = 0;
INITIALIZE_PASS_BEGIN(LoopUnroll, "loop-unroll", "Unroll loops", false, false)
INITIALIZE_AG_DEPENDENCY(TargetTransformInfo)
INITIALIZE_PASS_DEPENDENCY(LoopInfo)
INITIALIZE_PASS_DEPENDENCY(LoopSimplify)
INITIALIZE_PASS_DEPENDENCY(LCSSA)
@@ -113,11 +116,12 @@ Pass *llvm::createLoopUnrollPass(int Threshold, int Count, int AllowPartial) {
/// ApproximateLoopSize - Approximate the size of the loop.
static unsigned ApproximateLoopSize(const Loop *L, unsigned &NumCalls,
bool &NotDuplicatable, const DataLayout *TD) {
bool &NotDuplicatable,
const TargetTransformInfo &TTI) {
CodeMetrics Metrics;
for (Loop::block_iterator I = L->block_begin(), E = L->block_end();
I != E; ++I)
Metrics.analyzeBasicBlock(*I, TD);
Metrics.analyzeBasicBlock(*I, TTI);
NumCalls = Metrics.NumInlineCandidates;
NotDuplicatable = Metrics.notDuplicatable;
@@ -134,6 +138,7 @@ static unsigned ApproximateLoopSize(const Loop *L, unsigned &NumCalls,
bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) {
LoopInfo *LI = &getAnalysis<LoopInfo>();
ScalarEvolution *SE = &getAnalysis<ScalarEvolution>();
const TargetTransformInfo &TTI = getAnalysis<TargetTransformInfo>();
BasicBlock *Header = L->getHeader();
DEBUG(dbgs() << "Loop Unroll: F[" << Header->getParent()->getName()
@@ -181,11 +186,10 @@ bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) {
// Enforce the threshold.
if (Threshold != NoThreshold) {
const DataLayout *TD = getAnalysisIfAvailable<DataLayout>();
unsigned NumInlineCandidates;
bool notDuplicatable;
unsigned LoopSize = ApproximateLoopSize(L, NumInlineCandidates,
notDuplicatable, TD);
notDuplicatable, TTI);
DEBUG(dbgs() << " Loop Size = " << LoopSize << "\n");
if (notDuplicatable) {
DEBUG(dbgs() << " Not unrolling loop which contains non duplicatable"