For lshr by 0 bits, just return *this as a short cut. This also prevents
undefined behavior when the width > 64 bits.

llvm-svn: 37153

Fix a bug in the "fromString" method where radix 2,8 and 16 values were
not being generated correctly because the shl operator does not mutate its
object but returns a new value. Also, make the disti

Fix a bug in the "fromString" method where radix 2,8 and 16 values were
not being generated correctly because the shl operator does not mutate its
object but returns a new value. Also, make the distinction between radix
16 and the others more clear.

llvm-svn: 37111

show more ...

Make the results for the rotate functions correct when rotateAmt == 0.

llvm-svn: 37026

Add some things needed by the llvm-gcc version supporting bit accurate integer
types:
1. Functions to compute div/rem at the same time.
2. Further assurance that an APInt with 0 bitwidth cannot be co

Add some things needed by the llvm-gcc version supporting bit accurate integer
types:
1. Functions to compute div/rem at the same time.
2. Further assurance that an APInt with 0 bitwidth cannot be constructed.
3. Left and right rotate operations.
4. An exactLogBase2 function which requires an exact power of two or it
returns -1.

llvm-svn: 37025

show more ...

Fix shl to produce the correct result when the bitwidth is > 64 and the
shift amount is 0. Previously this code would do a lshr by the bit width
which can lead to incorrect results.

llvm-svn: 37010

silence some annoying gcc 4.3 warnings

llvm-svn: 36680

We want the number of bits needed, not the power of 2.

llvm-svn: 35977

Implement a getBitsNeeded method to determine how many bits are needed to
represent a string in binary form by an APInt.

llvm-svn: 35968

Fix an approximate calculation in an assertion not to give false negatives.

llvm-svn: 35901

Fix a bug in getAllOnesValue() which broke
some test cases for bitwidth > 64.

llvm-svn: 35232

Fix (and simplify) 48-bit byte swap.
Get pos/neg infinity the correct way.

llvm-svn: 35223

Fix coding standards violation.

llvm-svn: 35189

Implement extension of sign bits for negative values in the uint64_t
constructor. This helps to fix test/Assembler/2007-03-19-NegValue.ll

llvm-svn: 35180

Revert the last patch as it violates the conditions of sext/zext.

llvm-svn: 35068

For APInt::z/sext(width), if width == BitWidth, just return *this.

llvm-svn: 35065

Unbreak VC++ build.

llvm-svn: 34917

Fix ashr for bitwidths > 64. This is now validated up to 1024 bits.

llvm-svn: 34852

Use a better algorithm for rounding sqrt results. Change the FIXME about
this to a NOTE: because pari/gp results start to get rounded incorrectly
after 192 bits of precision. APInt and pari/gp never

Use a better algorithm for rounding sqrt results. Change the FIXME about
this to a NOTE: because pari/gp results start to get rounded incorrectly
after 192 bits of precision. APInt and pari/gp never differ by more than
1, but APInt is more accurate because it does not lose precision after 192
bits as does pari/gp.

llvm-svn: 34834

show more ...

Add a FIXME

llvm-svn: 34828

Fix a problem where shifting by 64-bits leads to incorrect results on PPC
but not on X86 becuase shift by word size is "undefined".

llvm-svn: 34825

Combine two lines that can be.

llvm-svn: 34818

Make the static table of results in sqrt const.

llvm-svn: 34791

Add methods for bit width modification: sextOrTrunc, zextOrTrunc.

llvm-svn: 34789

Use a real table in sqrt to shorten and quicken the code.
Thanks for the idea Chris.

llvm-svn: 34779

Add a square root function.

llvm-svn: 34775