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Added support for building against Android API-9 SDK

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Created an abstraction for log2, llvm::Log2 in Support/MathExtras.h

Hid Android problems inside of it

Differential Revision: http://reviews.llvm.org/D9467



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236680 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vince Harron
2015-05-07 00:05:26 +00:00
parent be6ad41cdd
commit a94bd7a780
2 changed files with 14 additions and 1 deletions
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13
include/llvm/Support/MathExtras.h
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@@ -24,6 +24,10 @@
#include <intrin.h>
#endif
#ifdef __ANDROID_NDK__
#include <android/api-level.h>
#endif
namespace llvm {
/// \brief The behavior an operation has on an input of 0.
enum ZeroBehavior {
@@ -449,6 +453,15 @@ inline unsigned countPopulation(T Value) {
return detail::PopulationCounter<T, sizeof(T)>::count(Value);
}
/// Log2 - This function returns the log base 2 of the specified value
inline double Log2(double Value) {
#if defined(__ANDROID_API__) && __ANDROID_API__ < 18
return (double)__builtin_log2l(Value);
#else
return log2(Value);
#endif
}
/// Log2_32 - This function returns the floor log base 2 of the specified value,
/// -1 if the value is zero. (32 bit edition.)
/// Ex. Log2_32(32) == 5, Log2_32(1) == 0, Log2_32(0) == -1, Log2_32(6) == 2