vendor/llvm/llvm-trunk-r302418

2 files changed, 9 insertions, 0 deletions

diff --git a/docs/Lexicon.rst b/docs/Lexicon.rst
index 5d16091e27e5..35687e258182 100644
--- a/docs/Lexicon.rst
+++ b/docs/Lexicon.rst
@@ -38,6 +38,13 @@ B
 **BB Vectorization**
     Basic-Block Vectorization
 
+**BDCE**
+    Bit-tracking dead code elimination. Some bit-wise instructions (shifts,
+    ands, ors, etc.) "kill" some of their input bits -- that is, they make it
+    such that those bits can be either zero or one without affecting control or
+    data flow of a program. The BDCE pass removes instructions that only
+    compute these dead bits.
+
 **BURS**
     Bottom Up Rewriting System --- A method of instruction selection for code
     generation.  An example is the `BURG
diff --git a/docs/MIRLangRef.rst b/docs/MIRLangRef.rst
index d5e227a2018c..b4ca8f2347a7 100644
--- a/docs/MIRLangRef.rst
+++ b/docs/MIRLangRef.rst
@@ -78,6 +78,8 @@ Simplifying MIR files
 The MIR code coming out of ``-stop-after``/``-stop-before`` is very verbose;
 Tests are more accessible and future proof when simplified:
 
+- Use the ``-simplify-mir`` option with llc.
+
 - Machine function attributes often have default values or the test works just
   as well with default values. Typical candidates for this are: `alignment:`,
   `exposesReturnsTwice`, `legalized`, `regBankSelected`, `selected`.