Ruby-VPI 21.1.0

Sat, 02 Aug 2008 13:10:22 -0700

This release adds new compilation hooks, improves support for Mentor Modelsim, simplifies the internal task scheduler, and shortens the critical path of the C extension.

Features

Added CFLAGS_EXTRA and LDFLAGS_EXTRA environment variables, which allow you to append to the default CFLAGS and LDFLAGS with which your Ruby installation was built.

Note that the CFLAGS and LDFLAGS environment variables still behave the same way: they completely override the defaults.

Improvements

Attempted to fix spurious failures with Modelsim 6.2g by advancing to the same time step¹ before applying cache write operations.

Replaced thread-based tasks with continuations (callcc) in internal scheduler.

Avoid some function calls on the C extension’s critical path by storing/reusing return values.

¹ How can advancing the simulator by zero time steps solve anything?

A time step is really composed of multiple time slots, so advancing by zero time steps could, in fact, take us to any future time slot withnin the current time step.

There are more details that I don’t care to explain here, but in general, this technique seems to cure Modelsim 6.2g by advancing it into a time slot where write operations can be applied correctly.

Ruby-VPI project

Ruby-VPI 21.1.0

Features

Improvements