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Get rid of leading zeros in the output of toString.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37175 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1938,14 +1938,33 @@ std::string APInt::toString(uint8_t radix, bool wantSigned) const {
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}
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if (radix != 10) {
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// For the 2, 8 and 16 bit cases, we can just shift instead of divide
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// because the number of bits per digit (1,3 and 4 respectively) divides
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// equaly. We just shift until there value is zero.
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// First, check for a zero value and just short circuit the logic below.
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if (*this == 0)
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result = "0";
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else {
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APInt tmp(*this);
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size_t insert_at = 0;
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if (wantSigned && this->isNegative()) {
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// They want to print the signed version and it is a negative value
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// Flip the bits and add one to turn it into the equivalent positive
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// value and put a '-' in the result.
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tmp.flip();
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tmp++;
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result = "-";
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insert_at = 1;
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}
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// Just shift tmp right for each digit width until it becomes zero
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uint32_t shift = (radix == 16 ? 4 : (radix == 8 ? 3 : 1));
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uint64_t mask = radix - 1;
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uint32_t shift = (radix == 16 ? 4 : radix == 8 ? 3 : 1);
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uint32_t nibbles = APINT_BITS_PER_WORD / shift;
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for (uint32_t i = 0; i < getNumWords(); ++i) {
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uint64_t value = pVal[i];
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for (uint32_t j = 0; j < nibbles; ++j) {
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result.insert(0, digits[ value & mask ]);
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value >>= shift;
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APInt zero(tmp.getBitWidth(), 0);
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while (tmp.ne(zero)) {
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unsigned digit = tmp.getZExtValue() & mask;
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tmp = tmp.lshr(shift);
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result.insert(insert_at, digits[digit]);
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}
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}
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return result;
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