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APInt: udivrem should use machine instructions for single-word APInts
This mirrors the behavior of APInt::udiv and APInt::urem. Some architectures, like X86, have a single instruction which can compute both division and remainder. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224217 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1956,6 +1956,18 @@ APInt APInt::srem(const APInt &RHS) const {
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void APInt::udivrem(const APInt &LHS, const APInt &RHS,
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APInt &Quotient, APInt &Remainder) {
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assert(LHS.BitWidth == RHS.BitWidth && "Bit widths must be the same");
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// First, deal with the easy case
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if (LHS.isSingleWord()) {
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assert(RHS.VAL != 0 && "Divide by zero?");
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uint64_t QuotVal = LHS.VAL / RHS.VAL;
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uint64_t RemVal = LHS.VAL % RHS.VAL;
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Quotient = APInt(LHS.BitWidth, QuotVal);
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Remainder = APInt(LHS.BitWidth, RemVal);
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return;
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}
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// Get some size facts about the dividend and divisor
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unsigned lhsBits = LHS.getActiveBits();
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unsigned lhsWords = !lhsBits ? 0 : (APInt::whichWord(lhsBits - 1) + 1);
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