(From Microsoft Visual C++ Floating-Point Optimization ) Many C++ compilers offer a "consistency" floating-point model (through a /Op or /fltconsistency switch) that enables a developer to create programs compliant with strict floating-point...

I thought I’d post a brief entry on how to retain intermediate results in extended precision. Consider the following direct summation algorithm: double sum(double[] a, int c) { 1: double result = 0.0; 2: for (int i=0; i<c;...

John Albert asks two questions: What would "register float" mean? How would this work under fp:fast? The basic guideline is that "intermediate expressions will be computed in as high as precision as is practical". For instance, suppose for a...

Igor Abramov wrote: “Well, I was in desperate need for 80-bit long doubles. Now I coded this type as set of asm inlines and application prototype shipped in such form. But the production version will be done for amd64, in 64-bit mode for performance...

So I may have been confusing people when I talk about VC8.0. When I refer to VC8.0, I'm referring to Visual C++ in Visual Studio 2005. The product version is 8.0, but the compiler itself (i.e. cl.exe) is “version 14“. I'll try to be...