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Allow '+' to appear in APInt strings, and add more unit tests.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79592 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Erick Tryzelaar
2009-08-21 03:15:14 +00:00
parent d4b4cf524b
commit bb97531a5a
2 changed files with 83 additions and 14 deletions
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lib/Support/APInt.cpp
+11 -6
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@@ -60,7 +60,7 @@ void APInt::initSlowCase(const APInt& that) {
APInt::APInt(unsigned numBits, unsigned numWords, const uint64_t bigVal[])
: BitWidth(numBits), VAL(0) {
assert(BitWidth && "bitwidth too small");
assert(BitWidth && "Bitwidth too small");
assert(bigVal && "Null pointer detected!");
if (isSingleWord())
VAL = bigVal[0];
@@ -78,7 +78,7 @@ APInt::APInt(unsigned numBits, unsigned numWords, const uint64_t bigVal[])
APInt::APInt(unsigned numbits, const StringRef& Str, uint8_t radix)
: BitWidth(numbits), VAL(0) {
assert(BitWidth && "bitwidth too small");
assert(BitWidth && "Bitwidth too small");
fromString(numbits, Str, radix);
}
@@ -589,12 +589,16 @@ APInt& APInt::flip(unsigned bitPosition) {
unsigned APInt::getBitsNeeded(const StringRef& str, uint8_t radix) {
assert(!str.empty() && "Invalid string length");
assert((radix == 10 || radix == 8 || radix == 16 || radix == 2) &&
"Radix should be 2, 8, 10, or 16!");
size_t slen = str.size();
// Each computation below needs to know if its negative
StringRef::iterator p = str.begin();
unsigned isNegative = str.front() == '-';
if (isNegative) {
if (*p == '-' || *p == '+') {
p++;
slen--;
assert(slen && "string is only a minus!");
}
@@ -619,7 +623,7 @@ unsigned APInt::getBitsNeeded(const StringRef& str, uint8_t radix) {
unsigned sufficient = slen*64/18;
// Convert to the actual binary value.
APInt tmp(sufficient, str.substr(isNegative), radix);
APInt tmp(sufficient, StringRef(p, slen), radix);
// Compute how many bits are required.
return isNegative + tmp.logBase2() + 1;
@@ -2004,13 +2008,14 @@ void APInt::udivrem(const APInt &LHS, const APInt &RHS,
void APInt::fromString(unsigned numbits, const StringRef& str, uint8_t radix) {
// Check our assumptions here
assert(!str.empty() && "Invalid string length");
assert((radix == 10 || radix == 8 || radix == 16 || radix == 2) &&
"Radix should be 2, 8, 10, or 16!");
assert(!str.empty() && "Invalid string length");
StringRef::iterator p = str.begin();
size_t slen = str.size();
bool isNeg = *p == '-';
if (isNeg) {
if (*p == '-' || *p == '+') {
p++;
slen--;
assert(slen && "string is only a minus!");