tree 5dd8c10c1133439026815de4afae8ae58083dd1c
parent f644a4b3a36d707b32dd4b7855774a346a575e96
author Jim Stichnoth <stichnot@chromium.org> 1426795310 -0700
committer Jim Stichnoth <stichnot@chromium.org> 1426795310 -0700

Subzero: Add fabs intrinsic support.

The intrinsic is lowered using the standard technique of masking off the FP sign bit, which is the high-order bit.

To construct this mask, we use the existing trick of loading a vector register with all "1" bits, then logical-shift-right by one bit.

In the future, we should add 128-bit vector values to the constant pool and force them to memory, and this could be used for the other routines that synthesize a vector constant.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4097
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/1022573004