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Eliminate unnecessary APInt construction.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35740 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Zhou Sheng 2007-04-07 17:48:27 +00:00
parent 6db928a62e
commit 414de4df41
1 changed files with 7 additions and 8 deletions
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15
lib/Analysis/ScalarEvolution.cpp
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@ -500,7 +500,7 @@ static SCEVHandle PartialFact(SCEVHandle V, unsigned NumSteps) {
// Handle this case efficiently, it is common to have constant iteration // Handle this case efficiently, it is common to have constant iteration
// counts while computing loop exit values. // counts while computing loop exit values.
if (SCEVConstant *SC = dyn_cast<SCEVConstant>(V)) { if (SCEVConstant *SC = dyn_cast<SCEVConstant>(V)) {
APInt Val = SC->getValue()->getValue(); const APInt& Val = SC->getValue()->getValue();
APInt Result(Val.getBitWidth(), 1); APInt Result(Val.getBitWidth(), 1);
for (; NumSteps; --NumSteps) for (; NumSteps; --NumSteps)
Result *= Val-(NumSteps-1); Result *= Val-(NumSteps-1);
@ -1336,7 +1336,7 @@ SCEVHandle ScalarEvolutionsImpl::createNodeForPHI(PHINode *PN) {
/// example, turn {4,+,8} -> 4. (S umod result) should always equal zero. /// example, turn {4,+,8} -> 4. (S umod result) should always equal zero.
static APInt GetConstantFactor(SCEVHandle S) { static APInt GetConstantFactor(SCEVHandle S) {
if (SCEVConstant *C = dyn_cast<SCEVConstant>(S)) { if (SCEVConstant *C = dyn_cast<SCEVConstant>(S)) {
APInt V = C->getValue()->getValue(); const APInt& V = C->getValue()->getValue();
if (!V.isMinValue()) if (!V.isMinValue())
return V; return V;
else // Zero is a multiple of everything. else // Zero is a multiple of everything.
@ -2096,23 +2096,22 @@ SolveQuadraticEquation(const SCEVAddRecExpr *AddRec) {
} }
uint32_t BitWidth = LC->getValue()->getValue().getBitWidth(); uint32_t BitWidth = LC->getValue()->getValue().getBitWidth();
APInt L(LC->getValue()->getValue()); const APInt& L = LC->getValue()->getValue();
APInt M(MC->getValue()->getValue()); const APInt& M = MC->getValue()->getValue();
APInt N(MC->getValue()->getValue()); const APInt& N = MC->getValue()->getValue();
APInt Two(BitWidth, 2); APInt Two(BitWidth, 2);
APInt Four(BitWidth, 4); APInt Four(BitWidth, 4);
{ {
using namespace APIntOps; using namespace APIntOps;
APInt C(L); const APInt& C = L;
// Convert from chrec coefficients to polynomial coefficients AX^2+BX+C // Convert from chrec coefficients to polynomial coefficients AX^2+BX+C
// The B coefficient is M-N/2 // The B coefficient is M-N/2
APInt B(M); APInt B(M);
B -= sdiv(N,Two); B -= sdiv(N,Two);
// The A coefficient is N/2 // The A coefficient is N/2
APInt A(N); APInt A(N.sdiv(Two));
A = A.sdiv(Two);
// Compute the B^2-4ac term. // Compute the B^2-4ac term.
APInt SqrtTerm(B); APInt SqrtTerm(B);