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improve portability to systems that don't have round, patch by 

Evzen Muller!

llvm-svn: 103877
This commit is contained in:
Chris Lattner 2010-05-15 17:11:55 +00:00
parent 93cd0f1c89
commit 9e01b615a4
2 changed files with 7 additions and 5 deletions
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3
llvm/include/llvm/Config/config.h.cmake
View File

@ -312,6 +312,9 @@
/* Define to 1 if you have the `roundf' function. */
#undef HAVE_ROUNDF
/* Define to 1 if you have the `round' function. */
#cmakedefine HAVE_ROUND ${HAVE_ROUND}
/* Define to 1 if you have the `sbrk' function. */
#cmakedefine HAVE_SBRK ${HAVE_SBRK}

9
llvm/lib/Support/APInt.cpp
View File

@ -1382,13 +1382,12 @@ APInt APInt::sqrt() const {
// libc sqrt function which will probably use a hardware sqrt computation.
// This should be faster than the algorithm below.
if (magnitude < 52) {
#if defined( _MSC_VER ) || defined(_MINIX)
// Amazingly, VC++ and Minix don't have round().
return APInt(BitWidth,
uint64_t(::sqrt(double(isSingleWord()?VAL:pVal[0]))) + 0.5);
#else
#if HAVE_ROUND
return APInt(BitWidth,
uint64_t(::round(::sqrt(double(isSingleWord()?VAL:pVal[0])))));
#else
return APInt(BitWidth,
uint64_t(::sqrt(double(isSingleWord()?VAL:pVal[0]))) + 0.5);
#endif
}