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Code Issues Projects Releases Wiki Activity

1. Fix a bug in fromString for the <= 64bits case

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2. Fix shl when shiftAmount == BitWidth.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34560 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-02-24 20:19:37 +00:00
parent 610fad85d2
commit 5bce8547f3
1 changed files with 29 additions and 17 deletions

46
lib/Support/APInt.cpp

@ -945,24 +945,33 @@ APInt APInt::lshr(uint32_t shiftAmt) const {
/// Left-shift this APInt by shiftAmt.
/// @brief Left-shift function.
APInt APInt::shl(uint32_t shiftAmt) const {
assert(shiftAmt <= BitWidth && "Invalid shift amount");
APInt API(*this);
if (API.isSingleWord())
API.VAL <<= shiftAmt;
else if (shiftAmt >= API.BitWidth)
memset(API.pVal, 0, API.getNumWords() * APINT_WORD_SIZE);
else {
if (uint32_t offset = shiftAmt / APINT_BITS_PER_WORD) {
for (uint32_t i = API.getNumWords() - 1; i > offset - 1; --i)
API.pVal[i] = API.pVal[i-offset];
memset(API.pVal, 0, offset * APINT_WORD_SIZE);
}
shiftAmt %= APINT_BITS_PER_WORD;
uint32_t i;
for (i = API.getNumWords() - 1; i > 0; --i)
API.pVal[i] = (API.pVal[i] << shiftAmt) |
(API.pVal[i-1] >> (APINT_BITS_PER_WORD - shiftAmt));
API.pVal[i] <<= shiftAmt;
if (API.isSingleWord()) {
if (shiftAmt == BitWidth)
API.VAL = 0;
else
API.VAL <<= shiftAmt;
API.clearUnusedBits();
return API;
}
if (shiftAmt == BitWidth) {
memset(API.pVal, 0, getNumWords() * APINT_WORD_SIZE);
return API;
}
if (uint32_t offset = shiftAmt / APINT_BITS_PER_WORD) {
for (uint32_t i = API.getNumWords() - 1; i > offset - 1; --i)
API.pVal[i] = API.pVal[i-offset];
memset(API.pVal, 0, offset * APINT_WORD_SIZE);
}
shiftAmt %= APINT_BITS_PER_WORD;
uint32_t i;
for (i = API.getNumWords() - 1; i > 0; --i)
API.pVal[i] = (API.pVal[i] << shiftAmt) |
(API.pVal[i-1] >> (APINT_BITS_PER_WORD - shiftAmt));
API.pVal[i] <<= shiftAmt;
API.clearUnusedBits();
return API;
}
@ -1423,7 +1432,10 @@ void APInt::fromString(uint32_t numbits, const char *str, uint32_t slen,
*this *= apradix;
// Add in the digit we just interpreted
apdigit.pVal[0] = digit;
if (apdigit.isSingleWord())
apdigit.VAL = digit;
else
apdigit.pVal[0] = digit;
*this += apdigit;
}
}