6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-09 10:31:14 +00:00
Code Issues Projects Releases Wiki Activity

Revert r100056. It was causing a failure on MSVC.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100062 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2010-03-31 23:26:26 +00:00
parent f8df814869
commit 9e9cca424c
1 changed files with 35 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
lib/CodeGen/MachineBasicBlock.cpp
View File

@ -23,7 +23,6 @@
#include "llvm/Target/TargetMachine.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/LeakDetector.h"
#include "llvm/Support/raw_ostream.h"
@ -460,41 +459,54 @@ bool MachineBasicBlock::CorrectExtraCFGEdges(MachineBasicBlock *DestA,
// conditional branch followed by an unconditional branch. DestA is the
// 'true' destination and DestB is the 'false' destination.
bool Changed = false;
bool MadeChange = false;
bool AddedFallThrough = false;
MachineFunction::iterator FallThru =
llvm::next(MachineFunction::iterator(this));
if (DestA == 0 && DestB == 0) {
// Block falls through to successor.
DestA = FallThru;
DestB = FallThru;
} else if (DestA != 0 && DestB == 0) {
if (isCond)
// Block ends in conditional jump that falls through to successor.
if (isCond) {
// If this block ends with a conditional branch that falls through to its
// successor, set DestB as the successor.
if (DestB == 0 && FallThru != getParent()->end()) {
DestB = FallThru;
AddedFallThrough = true;
}
} else {
assert(DestA && DestB && isCond &&
"CFG in a bad state. Cannot correct CFG edges");
// If this is an unconditional branch with no explicit dest, it must just be
// a fallthrough into DestA.
if (DestA == 0 && FallThru != getParent()->end()) {
DestA = FallThru;
AddedFallThrough = true;
}
}
// Remove superfluous edges. I.e., those which aren't destinations of this
// basic block, duplicate edges, or landing pads.
SmallPtrSet<const MachineBasicBlock*, 8> SeenMBBs;
MachineBasicBlock::succ_iterator SI = succ_begin();
MachineBasicBlock *OrigDestA = DestA, *OrigDestB = DestB;
while (SI != succ_end()) {
const MachineBasicBlock *MBB = *SI;
if (!SeenMBBs.insert(MBB) ||
(MBB != DestA && MBB != DestB && !MBB->isLandingPad())) {
// This is a superfluous edge, remove it.
SI = removeSuccessor(SI);
Changed = true;
} else {
if (MBB == DestA) {
DestA = 0;
++SI;
} else if (MBB == DestB) {
DestB = 0;
++SI;
} else if (MBB->isLandingPad() &&
MBB != OrigDestA && MBB != OrigDestB) {
++SI;
} else {
// Otherwise, this is a superfluous edge, remove it.
SI = removeSuccessor(SI);
MadeChange = true;
}
}
return Changed;
if (!AddedFallThrough)
assert(DestA == 0 && DestB == 0 && "MachineCFG is missing edges!");
else if (isCond)
assert(DestA == 0 && "MachineCFG is missing edges!");
return MadeChange;
}
/// findDebugLoc - find the next valid DebugLoc starting at MBBI, skipping