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Support unconditional fall-through branches in FastISel. 

llvm-svn: 55014
This commit is contained in:
Dan Gohman 2008-08-19 22:31:46 +00:00
parent 19edd216f2
commit 214343fbbe
1 changed files with 16 additions and 0 deletions
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16
llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
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@ -11,6 +11,7 @@
//
//===----------------------------------------------------------------------===//
#include "llvm/Instructions.h"
#include "llvm/CodeGen/FastISel.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
@ -41,6 +42,21 @@ FastISel::SelectInstructions(BasicBlock::iterator Begin, BasicBlock::iterator En
ValueMap[I] = ResultReg;
break;
}
case Instruction::Br: {
BranchInst *BI = cast<BranchInst>(I);
// For now, check for and handle just the most trivial case: an
// unconditional fall-through branch.
if (BI->isUnconditional() &&
next(MachineFunction::iterator(MBB))->getBasicBlock() ==
BI->getSuccessor(0)) {
MBB->addSuccessor(next(MachineFunction::iterator(MBB)));
break;
}
// Something more complicated. Halt "fast" selection and bail.
return I;
}
default:
// Unhandled instruction. Halt "fast" selection and bail.
return I;