[NaClDocs] Add documentation for the PNaCl fabs intrinsic.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4031

Review URL: https://codereview.chromium.org/938673003

Cr-Commit-Position: refs/heads/master@{#318100}

2 files changed, 28 insertions, 10 deletions

diff --git a/native_client_sdk/doc_generated/reference/pnacl-bitcode-abi.html b/native_client_sdk/doc_generated/reference/pnacl-bitcode-abi.html
index 6453709..6367b41 100644
--- a/native_client_sdk/doc_generated/reference/pnacl-bitcode-abi.html
+++ b/native_client_sdk/doc_generated/reference/pnacl-bitcode-abi.html
@@ -327,15 +327,23 @@ argument types: i16, i32, i64 (the types supported by C-style GCC builtins).</p>
 <li><code>llvm.ctlz</code></li>
 <li><code>llvm.cttz</code></li>
 <li><p class="first"><code>llvm.ctpop</code></p>
-<p>The overloaded llvm.ctlz, llvm.cttz, and llvm.ctpop intrinsics are only
-supported with the i32 and i64 argument types (the types supported by
-C-style GCC builtins).</p>
+<p>The overloaded <code>llvm.ctlz</code>, <code>llvm.cttz</code>, and <code>llvm.ctpop</code> intrinsics
+are only supported with the i32 and i64 argument types (the types
+supported by C-style GCC builtins).</p>
+</li>
+<li><p class="first"><code>llvm.fabs</code></p>
+<p>The overloaded <code>llvm.fabs</code> intrinsic is supported for float, double and
+<code>&lt;4 x float&gt;</code> argument types. It returns the absolute value of
+the argument. Some notable points: it returns <code>+0.0</code> when given <code>-0.0</code>,
+<code>+inf</code> when given <code>-inf</code>, and a positive <code>NaN</code> when given any
+signed <code>NaN</code>.</p>
+<p>NOTE: This intrinsic was introduced in the pepper_42 SDK.</p>
 </li>
 <li><p class="first"><code>llvm.sqrt</code></p>
 <p>The overloaded <code>llvm.sqrt</code> intrinsic is only supported for float
 and double arguments types. This has the same semantics as the libc
-sqrt function, returning NaN for values less than -0.0. However, this
-does not set <code>errno</code> when the result is NaN (see the
+sqrt function, returning <code>NaN</code> for values less than <code>-0.0</code>.
+However, this does not set <code>errno</code> when the result is NaN (see the
 <a class="reference internal" href="#ir-and-errno"><em>instructions and errno</em></a> section).</p>
 </li>
 <li><code>llvm.stacksave</code></li>
diff --git a/native_client_sdk/src/doc/reference/pnacl-bitcode-abi.rst b/native_client_sdk/src/doc/reference/pnacl-bitcode-abi.rst
index f5def16..2cc44da 100644
--- a/native_client_sdk/src/doc/reference/pnacl-bitcode-abi.rst
+++ b/native_client_sdk/src/doc/reference/pnacl-bitcode-abi.rst
@@ -430,16 +430,26 @@ The only intrinsics supported by PNaCl bitcode are the following.
 * ``llvm.cttz``
 * ``llvm.ctpop``
 
-  The overloaded llvm.ctlz, llvm.cttz, and llvm.ctpop intrinsics are only
-  supported with the i32 and i64 argument types (the types supported by
-  C-style GCC builtins).
+  The overloaded ``llvm.ctlz``, ``llvm.cttz``, and ``llvm.ctpop`` intrinsics
+  are only supported with the i32 and i64 argument types (the types
+  supported by C-style GCC builtins).
+
+* ``llvm.fabs``
+
+  The overloaded ``llvm.fabs`` intrinsic is supported for float, double and
+  ``<4 x float>`` argument types. It returns the absolute value of
+  the argument. Some notable points: it returns ``+0.0`` when given ``-0.0``,
+  ``+inf`` when given ``-inf``, and a positive ``NaN`` when given any
+  signed ``NaN``.
+
+  NOTE: This intrinsic was introduced in the pepper_42 SDK.
 
 * ``llvm.sqrt``
 
   The overloaded ``llvm.sqrt`` intrinsic is only supported for float
   and double arguments types. This has the same semantics as the libc
-  sqrt function, returning NaN for values less than -0.0. However, this
-  does not set ``errno`` when the result is NaN (see the
+  sqrt function, returning ``NaN`` for values less than ``-0.0``.
+  However, this does not set ``errno`` when the result is NaN (see the
   :ref:`instructions and errno <ir_and_errno>` section).
 
 * ``llvm.stacksave``