On Thu, May 06, 2010 at 01:22:27PM -0700, Ian Lance Taylor wrote: > Basile Starynkevitch <bas...@starynkevitch.net> writes: > > > Long time ago (probably in the GCC 2.95 & 3.2 time frame) I would > > imagine that the "register" keyword indeed affected register > > allocation, in the sense that variables declared with register where > > indeed & preferentially put in a machine register. > > I don't think the "register" keyword ever affected register allocation > in gcc. For that you have to go back to compilers of the 1970s.
I think it does, without optimization. There's some unique GDB tests that use this. It causes them to be live between statements in a machine register instead of always stored in stack slots. This might not be current information though. -- Daniel Jacobowitz CodeSourcery
