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QBE 1.3 - Release notes

qbe-1.3

QBE 1.3 took a while to cook, but it is the most significant release since 1.0 with around 7k new lines of code and 1.5k deleted ones. In addition to the usual bug fixes, QBE gained a new and original IL matching algorithm, new optimizations from Roland Paterson-Jones, Scott Graham added support for the Windows ABI, and I implemented a plan suggested by Michael Forney to have QBE produce position-independent code (as in shared objects). QBE is teamwork, and I am happy to thank all the contributors to this release. In the rest of the notes we will take a closer look at some of the meat of the release.

Faster

Every once in a while, the QBE fly stings an outstanding programmer. This time, Roland was the victim! Roland suggested we look at the coremark benchmark to give us a concrete but simple playground to optimize. Initial measurements with qbe-1.2 revealed that we were far behind our “70% of gcc -O2 ” goal, closer to 40%.…