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CodeGen: Use a single SlotTracker in MachineFunction::print()

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Expose enough of the IR-level `SlotTracker` so that
`MachineFunction::print()` can use a single one for printing
`BasicBlock`s.  Next step would be to lift this through a few more APIs
so that we can make other print methods faster.

Fixes PR23865, changing the runtime of `llc -print-machineinstrs` from
many minutes (killed after 3 minutes, but it wasn't very close) to
13 seconds for a 502185 line dump.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240842 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2015-06-26 22:04:20 +00:00
parent 0be7d0cf17
commit 9a61a42713
6 changed files with 162 additions and 22 deletions
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17
lib/CodeGen/MachineBasicBlock.cpp
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@@ -24,6 +24,7 @@
#include "llvm/CodeGen/SlotIndexes.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/ModuleSlotTracker.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/Support/Debug.h"
@@ -244,6 +245,20 @@ void MachineBasicBlock::print(raw_ostream &OS, SlotIndexes *Indexes) const {
<< " is null\n";
return;
}
const Function *F = MF->getFunction();
const Module *M = F ? F->getParent() : nullptr;
ModuleSlotTracker MST(M);
print(OS, MST, Indexes);
}
void MachineBasicBlock::print(raw_ostream &OS, ModuleSlotTracker &MST,
SlotIndexes *Indexes) const {
const MachineFunction *MF = getParent();
if (!MF) {
OS << "Can't print out MachineBasicBlock because parent MachineFunction"
<< " is null\n";
return;
}
if (Indexes)
OS << Indexes->getMBBStartIdx(this) << '\t';
@@ -253,7 +268,7 @@ void MachineBasicBlock::print(raw_ostream &OS, SlotIndexes *Indexes) const {
const char *Comma = "";
if (const BasicBlock *LBB = getBasicBlock()) {
OS << Comma << "derived from LLVM BB ";
LBB->printAsOperand(OS, /*PrintType=*/false);
LBB->printAsOperand(OS, /*PrintType=*/false, MST);
Comma = ", ";
}
if (isLandingPad()) { OS << Comma << "EH LANDING PAD"; Comma = ", "; }