tree d4aa59f11a6b6b9ba9c60e3ea54b7c9fe8ae8cee
parent a667fb8599e071351bb9449687a259d710c9e849
author Jim Stichnoth <stichnot@chromium.org> 1400791128 -0700
committer Jim Stichnoth <stichnot@chromium.org> 1400791128 -0700

Add Om1 lowering with no optimizations.

This adds infrastructure for low-level x86-32 instructions, and the target lowering patterns.

Practically no optimizations are performed.  Optimizations to be introduced later include liveness analysis, dead-code elimination, global linear-scan register allocation, linear-scan based stack slot coalescing, and compare/branch fusing.  One optimization that is present is simple coalescing of stack slots for variables that are only live within a single basic block.

There are also some fairly comprehensive cross tests.  This testing infrastructure translates bitcode using both Subzero and llc, and a testing harness calls both versions with a variety of "interesting" inputs and compares the results.  Specifically, Arithmetic, Icmp, Fcmp, and Cast instructions are tested this way, across all PNaCl primitive types.

BUG=
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/265703002