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bitfields_msvc
#include <iostream> #define be_smart typedef unsigned char u8; typedef unsigned short u16; typedef unsigned int u32; typedef unsigned long long u64; #ifdef be_smart enum MyEnum : u32 #else enum MyEnum : u8 #endif { MyEnum_Unknown = 0, MyEnum_CreationNotConfirmed, MyEnum_CreationConfirmed, MyEnum_DeletionNotConfirmed }; struct MyStruct { u64 handle; u16 firstWrittenIndex; u16 lastWrittenIndex; #ifdef be_smart enum MyEnum state : 8; #else enum MyEnum state; #endif u32 pendingInit : 1; u32 pendingDelete : 1; u32 pendingFlush : 1; u32 isFlushed : 1; u32 hasDirtyStates : 1; u32 hasModifiedMask : 1; u32 pendingNewBaseline : 1; u32 isStaticNetObject : 1; u32 countToNextBaseLine : 8; u32 pendingNewBaselineIndex : 4; }; int main() { u32 size = sizeof(MyStruct); u32 alignment = alignof(MyStruct); #ifdef be_smart printf("I'm smart!\n"); #endif printf("sizeof(MyStruct): %u, align %u", size, alignment); }
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What is the fastest/most efficient way to find the highest set bit (msb) in an integer in C?
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