我大声尖叫.这真让你好奇.
我担心如果我选择"赞成大小超速"会发生什么.
设置:Visual Studio 2010
<Optimization>MaxSpeed</Optimization>
<IntrinsicFunctions>true</IntrinsicFunctions>
<FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
<EnableEnhancedInstructionSet>StreamingSIMDExtensions2</EnableEnhancedInstructionSet>
<FloatingPointModel>Precise</FloatingPointModel>
如何:
for (i = 0; i < some_num; i++)
{
one += buf[i] * buf[i];
two += buf[i] * buf[off+i];
}
翻译成这个:
131: for (i = 0; i < some_num; i++)
132: {
133: one += buf[i] * buf[i];
00404B40 movss xmm0,dword ptr [eax-4]
00404B45 movss xmm7,dword ptr [esp+18h]
00404B4B movss xmm2,dword ptr [eax]
00404B4F cvtps2pd xmm3,xmm2
00404B52 movss xmm4,dword ptr [eax+4]
00404B57 cvtps2pd xmm1,xmm0
00404B5A mulsd xmm3,xmm3
00404B5E movss …