Major performance problem with std.array.front()

[Walter Bright]

On 3/7/2014 7:24 AM, Adam D. Ruppe wrote:
> But you can't inline asm function,

I intend to fix that for dmd, but haven't had the time.

> and checking the overflow flag needs asm. (or a compiler intrinsic.)

For that, I was thinking of having the compiler recognize one of the common 
coding patterns for detecting overflow, and then generating efficient overflow 
checks. Then documenting the pattern as being specially detected.

This means the code will still be successful for compilers that don't detect the 
pattern, and no language changes would be required.