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Fix another place where DEBUG_VALUE affected codegen.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98181 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2010-03-10 19:57:56 +00:00
parent bbf81d8811
commit 2cd9ffef6e
1 changed files with 12 additions and 1 deletions
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13
lib/CodeGen/BranchFolding.cpp
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@ -984,6 +984,17 @@ static bool IsEmptyBlock(MachineBasicBlock *MBB) {
return true;
}
// Blocks with only debug info and branches should be considered the same
// as blocks with only branches.
static bool IsBranchOnlyBlock(MachineBasicBlock *MBB) {
MachineBasicBlock::iterator MBBI, MBBE;
for (MBBI = MBB->begin(), MBBE = MBB->end(); MBBI!=MBBE; ++MBBI) {
if (!MBBI->isDebugValue())
break;
}
return (MBBI->getDesc().isBranch());
}
/// IsBetterFallthrough - Return true if it would be clearly better to
/// fall-through to MBB1 than to fall through into MBB2. This has to return
/// a strict ordering, returning true for both (MBB1,MBB2) and (MBB2,MBB1) will
@ -1206,7 +1217,7 @@ ReoptimizeBlock:
// If this branch is the only thing in its block, see if we can forward
// other blocks across it.
if (CurTBB && CurCond.empty() && CurFBB == 0 &&
MBB->begin()->getDesc().isBranch() && CurTBB != MBB &&
IsBranchOnlyBlock(MBB) && CurTBB != MBB &&
!MBB->hasAddressTaken()) {
// This block may contain just an unconditional branch. Because there can
// be 'non-branch terminators' in the block, try removing the branch and