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Make JumpThreading smart enough to properly thread StrSwitch when it's compiled with clang++. 

llvm-svn: 112198
This commit is contained in:
Owen Anderson 2010-08-26 17:40:24 +00:00
parent 929cc7618f
commit bd2ecc7e68
2 changed files with 239 additions and 17 deletions
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94
llvm/lib/Transforms/Scalar/JumpThreading.cpp
View File

@ -322,6 +322,12 @@ ComputeValueKnownInPredecessors(Value *V, BasicBlock *BB,PredValueInfo &Result){
if (isa<ConstantInt>(InVal) || isa<UndefValue>(InVal)) {
ConstantInt *CI = dyn_cast<ConstantInt>(InVal);
Result.push_back(std::make_pair(CI, PN->getIncomingBlock(i)));
} else if (LVI) {
Constant *CI = LVI->getConstantOnEdge(InVal,
PN->getIncomingBlock(i), BB);
ConstantInt *CInt = dyn_cast_or_null<ConstantInt>(CI);
if (CInt)
Result.push_back(std::make_pair(CInt, PN->getIncomingBlock(i)));
}
}
return !Result.empty();
@ -367,6 +373,10 @@ ComputeValueKnownInPredecessors(Value *V, BasicBlock *BB,PredValueInfo &Result){
}
}
return !Result.empty();
// Try to process a few other binary operator patterns.
} else if (isa<BinaryOperator>(I)) {
}
// Handle the NOT form of XOR.
@ -384,6 +394,21 @@ ComputeValueKnownInPredecessors(Value *V, BasicBlock *BB,PredValueInfo &Result){
cast<ConstantInt>(ConstantExpr::getNot(Result[i].first));
return true;
}
// Try to simplify some other binary operator values.
} else if (BinaryOperator *BO = dyn_cast<BinaryOperator>(I)) {
// AND or OR of a value with itself is that value.
ConstantInt *CI = dyn_cast<ConstantInt>(BO->getOperand(1));
if (CI && (BO->getOpcode() == Instruction::And ||
BO->getOpcode() == Instruction::Or)) {
SmallVector<std::pair<ConstantInt*, BasicBlock*>, 8> LHSVals;
ComputeValueKnownInPredecessors(BO->getOperand(0), BB, LHSVals);
for (unsigned i = 0, e = LHSVals.size(); i != e; ++i)
if (LHSVals[i].first == CI)
Result.push_back(std::make_pair(CI, LHSVals[i].second));
return !Result.empty();
}
}
// Handle compare with phi operand, where the PHI is defined in this block.
@ -423,28 +448,63 @@ ComputeValueKnownInPredecessors(Value *V, BasicBlock *BB,PredValueInfo &Result){
// If comparing a live-in value against a constant, see if we know the
// live-in value on any predecessors.
if (LVI && isa<Constant>(Cmp->getOperand(1)) &&
Cmp->getType()->isIntegerTy() && // Not vector compare.
(!isa<Instruction>(Cmp->getOperand(0)) ||
cast<Instruction>(Cmp->getOperand(0))->getParent() != BB)) {
Constant *RHSCst = cast<Constant>(Cmp->getOperand(1));
Cmp->getType()->isIntegerTy()) {
if (!isa<Instruction>(Cmp->getOperand(0)) ||
cast<Instruction>(Cmp->getOperand(0))->getParent() != BB) {
Constant *RHSCst = cast<Constant>(Cmp->getOperand(1));
for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI) {
BasicBlock *P = *PI;
// If the value is known by LazyValueInfo to be a constant in a
// predecessor, use that information to try to thread this block.
LazyValueInfo::Tristate
Res = LVI->getPredicateOnEdge(Cmp->getPredicate(), Cmp->getOperand(0),
RHSCst, P, BB);
if (Res == LazyValueInfo::Unknown)
continue;
for (pred_iterator PI = pred_begin(BB), E = pred_end(BB);PI != E; ++PI){
BasicBlock *P = *PI;
// If the value is known by LazyValueInfo to be a constant in a
// predecessor, use that information to try to thread this block.
LazyValueInfo::Tristate Res =
LVI->getPredicateOnEdge(Cmp->getPredicate(), Cmp->getOperand(0),
RHSCst, P, BB);
if (Res == LazyValueInfo::Unknown)
continue;
Constant *ResC = ConstantInt::get(Cmp->getType(), Res);
Result.push_back(std::make_pair(cast<ConstantInt>(ResC), P));
Constant *ResC = ConstantInt::get(Cmp->getType(), Res);
Result.push_back(std::make_pair(cast<ConstantInt>(ResC), P));
}
return !Result.empty();
}
// Try to find a constant value for the LHS of an equality comparison,
// and evaluate it statically if we can.
if (Cmp->getPredicate() == CmpInst::ICMP_EQ ||
Cmp->getPredicate() == CmpInst::ICMP_NE) {
SmallVector<std::pair<ConstantInt*, BasicBlock*>, 8> LHSVals;
ComputeValueKnownInPredecessors(I->getOperand(0), BB, LHSVals);
ConstantInt *True = ConstantInt::getTrue(I->getContext());
ConstantInt *False = ConstantInt::getFalse(I->getContext());
if (Cmp->getPredicate() == CmpInst::ICMP_NE) std::swap(True, False);
for (unsigned i = 0, e = LHSVals.size(); i != e; ++i) {
if (LHSVals[i].first == Cmp->getOperand(1))
Result.push_back(std::make_pair(True, LHSVals[i].second));
else
Result.push_back(std::make_pair(False, LHSVals[i].second));
}
return !Result.empty();
}
return !Result.empty();
}
}
if (LVI) {
// If all else fails, see if LVI can figure out a constant value for us.
Constant *CI = LVI->getConstant(V, BB);
ConstantInt *CInt = dyn_cast_or_null<ConstantInt>(CI);
if (CInt) {
for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
Result.push_back(std::make_pair(CInt, *PI));
}
return !Result.empty();
}
return false;
}

162
llvm/test/Transforms/JumpThreading/2010-08-26-and.ll Normal file
View File

@ -0,0 +1,162 @@
; RUN: opt -jump-threading -enable-jump-threading-lvi -S < %s | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-darwin10.0.0"
%class.StringSwitch = type { i8*, i32, i32, i8 }
@.str = private constant [4 x i8] c"red\00" ; <[4 x i8]*> [#uses=1]
@.str1 = private constant [7 x i8] c"orange\00" ; <[7 x i8]*> [#uses=1]
@.str2 = private constant [7 x i8] c"yellow\00" ; <[7 x i8]*> [#uses=1]
@.str3 = private constant [6 x i8] c"green\00" ; <[6 x i8]*> [#uses=1]
@.str4 = private constant [5 x i8] c"blue\00" ; <[5 x i8]*> [#uses=1]
@.str5 = private constant [7 x i8] c"indigo\00" ; <[7 x i8]*> [#uses=1]
@.str6 = private constant [7 x i8] c"violet\00" ; <[7 x i8]*> [#uses=1]
@.str7 = private constant [12 x i8] c"Color = %d\0A\00" ; <[12 x i8]*> [#uses=1]
define i32 @main(i32 %argc, i8** nocapture %argv) nounwind ssp {
entry:
%cmp142 = icmp sgt i32 %argc, 1 ; <i1> [#uses=1]
br i1 %cmp142, label %bb.nph, label %for.end
bb.nph: ; preds = %entry
%tmp = add i32 %argc, -2 ; <i32> [#uses=1]
%tmp144 = zext i32 %tmp to i64 ; <i64> [#uses=1]
%tmp145 = add i64 %tmp144, 1 ; <i64> [#uses=1]
br label %land.lhs.true.i
land.lhs.true.i: ; preds = %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit134, %bb.nph
%retval.0.i.pre161 = phi i32 [ undef, %bb.nph ], [ %retval.0.i.pre, %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit134 ] ; <i32> [#uses=3]
%indvar = phi i64 [ 0, %bb.nph ], [ %tmp146, %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit134 ] ; <i64> [#uses=1]
%tmp146 = add i64 %indvar, 1 ; <i64> [#uses=3]
%arrayidx = getelementptr i8** %argv, i64 %tmp146 ; <i8**> [#uses=1]
%tmp6 = load i8** %arrayidx, align 8 ; <i8*> [#uses=8]
%call.i.i = call i64 @strlen(i8* %tmp6) nounwind ; <i64> [#uses=1]
%conv.i.i = trunc i64 %call.i.i to i32 ; <i32> [#uses=6]\
; CHECK: switch i32 %conv.i.i
; CHECK-NOT: if.then.i40
; CHECK: }
switch i32 %conv.i.i, label %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit [
i32 3, label %land.lhs.true5.i
i32 6, label %land.lhs.true5.i37
]
land.lhs.true5.i: ; preds = %land.lhs.true.i
%call.i = call i32 @memcmp(i8* getelementptr inbounds ([4 x i8]* @.str, i64 0, i64 0), i8* %tmp6, i64 4) nounwind ; <i32> [#uses=1]
%cmp9.i = icmp eq i32 %call.i, 0 ; <i1> [#uses=1]
br i1 %cmp9.i, label %_ZN12StringSwitchI5ColorE4CaseILj4EEERS1_RAT__KcRKS0_.exit, label %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit
_ZN12StringSwitchI5ColorE4CaseILj4EEERS1_RAT__KcRKS0_.exit: ; preds = %land.lhs.true5.i
br label %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit
land.lhs.true5.i37: ; preds = %land.lhs.true.i
%call.i35 = call i32 @memcmp(i8* getelementptr inbounds ([7 x i8]* @.str1, i64 0, i64 0), i8* %tmp6, i64 7) nounwind ; <i32> [#uses=1]
%cmp9.i36 = icmp eq i32 %call.i35, 0 ; <i1> [#uses=1]
br i1 %cmp9.i36, label %if.then.i40, label %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit
if.then.i40: ; preds = %land.lhs.true5.i37
br label %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit
_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit: ; preds = %if.then.i40, %land.lhs.true5.i37, %_ZN12StringSwitchI5ColorE4CaseILj4EEERS1_RAT__KcRKS0_.exit, %land.lhs.true5.i, %land.lhs.true.i
%retval.0.i.pre159 = phi i32 [ 1, %_ZN12StringSwitchI5ColorE4CaseILj4EEERS1_RAT__KcRKS0_.exit ], [ %retval.0.i.pre161, %land.lhs.true5.i37 ], [ 2, %if.then.i40 ], [ %retval.0.i.pre161, %land.lhs.true5.i ], [ %retval.0.i.pre161, %land.lhs.true.i ] ; <i32> [#uses=2]
%tmp2.i44 = phi i8 [ 1, %_ZN12StringSwitchI5ColorE4CaseILj4EEERS1_RAT__KcRKS0_.exit ], [ 0, %land.lhs.true5.i37 ], [ 1, %if.then.i40 ], [ 0, %land.lhs.true5.i ], [ 0, %land.lhs.true.i ] ; <i8> [#uses=3]
%tobool.i46 = icmp eq i8 %tmp2.i44, 0 ; <i1> [#uses=1]
%cmp.i49 = icmp eq i32 %conv.i.i, 6 ; <i1> [#uses=1]
%or.cond = and i1 %tobool.i46, %cmp.i49 ; <i1> [#uses=1]
br i1 %or.cond, label %land.lhs.true5.i55, label %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit60
land.lhs.true5.i55: ; preds = %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit
%call.i53 = call i32 @memcmp(i8* getelementptr inbounds ([7 x i8]* @.str2, i64 0, i64 0), i8* %tmp6, i64 7) nounwind ; <i32> [#uses=1]
%cmp9.i54 = icmp eq i32 %call.i53, 0 ; <i1> [#uses=1]
br i1 %cmp9.i54, label %if.then.i58, label %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit60
if.then.i58: ; preds = %land.lhs.true5.i55
br label %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit60
_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit60: ; preds = %if.then.i58, %land.lhs.true5.i55, %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit
%retval.0.i.pre158 = phi i32 [ %retval.0.i.pre159, %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit ], [ %retval.0.i.pre159, %land.lhs.true5.i55 ], [ 3, %if.then.i58 ] ; <i32> [#uses=2]
%tmp2.i63 = phi i8 [ %tmp2.i44, %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit ], [ %tmp2.i44, %land.lhs.true5.i55 ], [ 1, %if.then.i58 ] ; <i8> [#uses=3]
%tmp14.i64 = and i8 %tmp2.i63, 1 ; <i8> [#uses=1]
%tobool.i65 = icmp eq i8 %tmp14.i64, 0 ; <i1> [#uses=1]
%cmp.i68 = icmp eq i32 %conv.i.i, 5 ; <i1> [#uses=1]
%or.cond168 = and i1 %tobool.i65, %cmp.i68 ; <i1> [#uses=1]
br i1 %or.cond168, label %land.lhs.true5.i74, label %_ZN12StringSwitchI5ColorE4CaseILj6EEERS1_RAT__KcRKS0_.exit
land.lhs.true5.i74: ; preds = %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit60
%call.i72 = call i32 @memcmp(i8* getelementptr inbounds ([6 x i8]* @.str3, i64 0, i64 0), i8* %tmp6, i64 6) nounwind ; <i32> [#uses=1]
%cmp9.i73 = icmp eq i32 %call.i72, 0 ; <i1> [#uses=1]
br i1 %cmp9.i73, label %if.then.i77, label %_ZN12StringSwitchI5ColorE4CaseILj6EEERS1_RAT__KcRKS0_.exit
if.then.i77: ; preds = %land.lhs.true5.i74
br label %_ZN12StringSwitchI5ColorE4CaseILj6EEERS1_RAT__KcRKS0_.exit
_ZN12StringSwitchI5ColorE4CaseILj6EEERS1_RAT__KcRKS0_.exit: ; preds = %if.then.i77, %land.lhs.true5.i74, %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit60
%retval.0.i.pre157 = phi i32 [ %retval.0.i.pre158, %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit60 ], [ %retval.0.i.pre158, %land.lhs.true5.i74 ], [ 4, %if.then.i77 ] ; <i32> [#uses=2]
%tmp2.i81 = phi i8 [ %tmp2.i63, %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit60 ], [ %tmp2.i63, %land.lhs.true5.i74 ], [ 1, %if.then.i77 ] ; <i8> [#uses=3]
%tmp14.i82 = and i8 %tmp2.i81, 1 ; <i8> [#uses=1]
%tobool.i83 = icmp eq i8 %tmp14.i82, 0 ; <i1> [#uses=1]
%cmp.i86 = icmp eq i32 %conv.i.i, 4 ; <i1> [#uses=1]
%or.cond169 = and i1 %tobool.i83, %cmp.i86 ; <i1> [#uses=1]
br i1 %or.cond169, label %land.lhs.true5.i92, label %_ZN12StringSwitchI5ColorE4CaseILj5EEERS1_RAT__KcRKS0_.exit
land.lhs.true5.i92: ; preds = %_ZN12StringSwitchI5ColorE4CaseILj6EEERS1_RAT__KcRKS0_.exit
%call.i90 = call i32 @memcmp(i8* getelementptr inbounds ([5 x i8]* @.str4, i64 0, i64 0), i8* %tmp6, i64 5) nounwind ; <i32> [#uses=1]
%cmp9.i91 = icmp eq i32 %call.i90, 0 ; <i1> [#uses=1]
br i1 %cmp9.i91, label %if.then.i95, label %_ZN12StringSwitchI5ColorE4CaseILj5EEERS1_RAT__KcRKS0_.exit
if.then.i95: ; preds = %land.lhs.true5.i92
br label %_ZN12StringSwitchI5ColorE4CaseILj5EEERS1_RAT__KcRKS0_.exit
_ZN12StringSwitchI5ColorE4CaseILj5EEERS1_RAT__KcRKS0_.exit: ; preds = %if.then.i95, %land.lhs.true5.i92, %_ZN12StringSwitchI5ColorE4CaseILj6EEERS1_RAT__KcRKS0_.exit
%retval.0.i.pre156 = phi i32 [ %retval.0.i.pre157, %_ZN12StringSwitchI5ColorE4CaseILj6EEERS1_RAT__KcRKS0_.exit ], [ %retval.0.i.pre157, %land.lhs.true5.i92 ], [ 5, %if.then.i95 ] ; <i32> [#uses=2]
%tmp2.i99 = phi i8 [ %tmp2.i81, %_ZN12StringSwitchI5ColorE4CaseILj6EEERS1_RAT__KcRKS0_.exit ], [ %tmp2.i81, %land.lhs.true5.i92 ], [ 1, %if.then.i95 ] ; <i8> [#uses=3]
%tmp14.i100 = and i8 %tmp2.i99, 1 ; <i8> [#uses=1]
%tobool.i101 = icmp eq i8 %tmp14.i100, 0 ; <i1> [#uses=1]
%cmp.i104 = icmp eq i32 %conv.i.i, 6 ; <i1> [#uses=1]
%or.cond170 = and i1 %tobool.i101, %cmp.i104 ; <i1> [#uses=1]
br i1 %or.cond170, label %land.lhs.true5.i110, label %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit115
land.lhs.true5.i110: ; preds = %_ZN12StringSwitchI5ColorE4CaseILj5EEERS1_RAT__KcRKS0_.exit
%call.i108 = call i32 @memcmp(i8* getelementptr inbounds ([7 x i8]* @.str5, i64 0, i64 0), i8* %tmp6, i64 7) nounwind ; <i32> [#uses=1]
%cmp9.i109 = icmp eq i32 %call.i108, 0 ; <i1> [#uses=1]
br i1 %cmp9.i109, label %if.then.i113, label %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit115
if.then.i113: ; preds = %land.lhs.true5.i110
br label %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit115
_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit115: ; preds = %if.then.i113, %land.lhs.true5.i110, %_ZN12StringSwitchI5ColorE4CaseILj5EEERS1_RAT__KcRKS0_.exit
%retval.0.i.pre155 = phi i32 [ %retval.0.i.pre156, %_ZN12StringSwitchI5ColorE4CaseILj5EEERS1_RAT__KcRKS0_.exit ], [ %retval.0.i.pre156, %land.lhs.true5.i110 ], [ 6, %if.then.i113 ] ; <i32> [#uses=2]
%tmp2.i118 = phi i8 [ %tmp2.i99, %_ZN12StringSwitchI5ColorE4CaseILj5EEERS1_RAT__KcRKS0_.exit ], [ %tmp2.i99, %land.lhs.true5.i110 ], [ 1, %if.then.i113 ] ; <i8> [#uses=3]
%tmp14.i119 = and i8 %tmp2.i118, 1 ; <i8> [#uses=1]
%tobool.i120 = icmp eq i8 %tmp14.i119, 0 ; <i1> [#uses=1]
%cmp.i123 = icmp eq i32 %conv.i.i, 6 ; <i1> [#uses=1]
%or.cond171 = and i1 %tobool.i120, %cmp.i123 ; <i1> [#uses=1]
br i1 %or.cond171, label %land.lhs.true5.i129, label %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit134
land.lhs.true5.i129: ; preds = %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit115
%call.i127 = call i32 @memcmp(i8* getelementptr inbounds ([7 x i8]* @.str6, i64 0, i64 0), i8* %tmp6, i64 7) nounwind ; <i32> [#uses=1]
%cmp9.i128 = icmp eq i32 %call.i127, 0 ; <i1> [#uses=1]
br i1 %cmp9.i128, label %if.then.i132, label %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit134
if.then.i132: ; preds = %land.lhs.true5.i129
br label %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit134
_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit134: ; preds = %if.then.i132, %land.lhs.true5.i129, %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit115
%retval.0.i.pre = phi i32 [ %retval.0.i.pre155, %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit115 ], [ %retval.0.i.pre155, %land.lhs.true5.i129 ], [ 7, %if.then.i132 ] ; <i32> [#uses=2]
%tmp2.i137 = phi i8 [ %tmp2.i118, %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit115 ], [ %tmp2.i118, %land.lhs.true5.i129 ], [ 1, %if.then.i132 ] ; <i8> [#uses=1]
%tmp7.i138 = and i8 %tmp2.i137, 1 ; <i8> [#uses=1]
%tobool.i139 = icmp eq i8 %tmp7.i138, 0 ; <i1> [#uses=1]
%retval.0.i = select i1 %tobool.i139, i32 0, i32 %retval.0.i.pre ; <i32> [#uses=1]
%call22 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([12 x i8]* @.str7, i64 0, i64 0), i32 %retval.0.i) ; <i32> [#uses=0]
%exitcond = icmp eq i64 %tmp146, %tmp145 ; <i1> [#uses=1]
br i1 %exitcond, label %for.end, label %land.lhs.true.i
for.end: ; preds = %_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit134, %entry
ret i32 0
}
declare i32 @printf(i8* nocapture, ...) nounwind
declare i32 @memcmp(i8* nocapture, i8* nocapture, i64) nounwind readonly
declare i64 @strlen(i8* nocapture) nounwind readonly