tree 07a5389b98bf5f510a8a11ff495cd6c7e7cee21e
parent b3401d27a236b81393092b4d571df473b5bba64b
author Jim Stichnoth <stichnot@chromium.org> 1432054124 -0700
committer Jim Stichnoth <stichnot@chromium.org> 1432054124 -0700

Subzero: Use cmov to improve lowering for the select instruction.

This is instead of explicit control flow which may interfere with branch prediction.  However, explicit control flow is still needed for types other than i16 and i32, due to cmov limitations.

The assembler for cmov is extended to allow the non-dest operand to be a memory operand.

The select lowering is getting large enough that it was in our best interest to combine the default lowering with the bool-folding optimization.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4095
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/1125323004