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Add bundle aware API for querying instruction properties and switch the code

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generator to it. For non-bundle instructions, these behave exactly the same
as the MC layer API.

For properties like mayLoad / mayStore, look into the bundle and if any of the
bundled instructions has the property it would return true.
For properties like isPredicable, only return true if *all* of the bundled
instructions have the property.
For properties like canFoldAsLoad, isCompare, conservatively return false for
bundles.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146026 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2011-12-07 07:15:52 +00:00
parent 5729c5848c
commit 5a96b3dad2
69 changed files with 596 additions and 354 deletions
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lib/CodeGen/BranchFolding.cpp
+7 -8
View File
@@ -432,10 +432,9 @@ static unsigned EstimateRuntime(MachineBasicBlock::iterator I,
for (; I != E; ++I) {
if (I->isDebugValue())
continue;
const MCInstrDesc &MCID = I->getDesc();
if (MCID.isCall())
if (I->isCall())
Time += 10;
else if (MCID.mayLoad() || MCID.mayStore())
else if (I->mayLoad() || I->mayStore())
Time += 2;
else
++Time;
@@ -502,7 +501,7 @@ static unsigned CountTerminators(MachineBasicBlock *MBB,
break;
}
--I;
if (!I->getDesc().isTerminator()) break;
if (!I->isTerminator()) break;
++NumTerms;
}
return NumTerms;
@@ -550,8 +549,8 @@ static bool ProfitableToMerge(MachineBasicBlock *MBB1,
// heuristics.
unsigned EffectiveTailLen = CommonTailLen;
if (SuccBB && MBB1 != PredBB && MBB2 != PredBB &&
!MBB1->back().getDesc().isBarrier() &&
!MBB2->back().getDesc().isBarrier())
!MBB1->back().isBarrier() &&
!MBB2->back().isBarrier())
++EffectiveTailLen;
// Check if the common tail is long enough to be worthwhile.
@@ -983,7 +982,7 @@ static bool IsBranchOnlyBlock(MachineBasicBlock *MBB) {
if (!MBBI->isDebugValue())
break;
}
return (MBBI->getDesc().isBranch());
return (MBBI->isBranch());
}
/// IsBetterFallthrough - Return true if it would be clearly better to
@@ -1011,7 +1010,7 @@ static bool IsBetterFallthrough(MachineBasicBlock *MBB1,
MachineBasicBlock::iterator MBB2I = --MBB2->end();
while (MBB2I->isDebugValue())
--MBB2I;
return MBB2I->getDesc().isCall() && !MBB1I->getDesc().isCall();
return MBB2I->isCall() && !MBB1I->isCall();
}
/// OptimizeBlock - Analyze and optimize control flow related to the specified