tree 32ffe0abbf3002b708259d4c1a7fb9040ad33098
parent e6e497dbc2dc6e97b33f7fb1ec661df92d0ce100
author Matt Wala <wala@chromium.org> 1406749479 -0700
committer Matt Wala <wala@chromium.org> 1406749479 -0700

Subzero: Add support for SSE4.1 instructions.

* Add initial support for code generation with SSE4.1 instructions. The
following operations are affected:
 - multiplication with v4i32
 - select
 - insertelement
 - extractelement

* Add appropriate lit checks for SSE4.1 instructions. Run the crosstests
in both SSE2 and SSE4.1 mode.

* Introduce the -mattr flag to llvm2ice to control which instruction set
gets used.

BUG=none
R=jvoung@chromium.org, stichnot@chromium.org

Review URL: https://codereview.chromium.org/427843002