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Diffstat (limited to 'docs/Passes.html')
| -rw-r--r-- | docs/Passes.html | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/docs/Passes.html b/docs/Passes.html index 96d1aee..37a304d 100644 --- a/docs/Passes.html +++ b/docs/Passes.html @@ -126,6 +126,7 @@ perl -e '$/ = undef; for (split(/\n/, <>)) { s:^ *///? ?::; print " <p>\n" if ! <tr><td><a href="#adce">-adce</a></td><td>Aggressive Dead Code Elimination</td></tr> <tr><td><a href="#always-inline">-always-inline</a></td><td>Inliner for always_inline functions</td></tr> <tr><td><a href="#argpromotion">-argpromotion</a></td><td>Promote 'by reference' arguments to scalars</td></tr> +<tr><td><a href="#bb-vectorize">-bb-vectorize</a></td><td>Combine instructions to form vector instructions within basic blocks</td></tr> <tr><td><a href="#block-placement">-block-placement</a></td><td>Profile Guided Basic Block Placement</td></tr> <tr><td><a href="#break-crit-edges">-break-crit-edges</a></td><td>Break critical edges in CFG</td></tr> <tr><td><a href="#codegenprepare">-codegenprepare</a></td><td>Optimize for code generation</td></tr> @@ -817,6 +818,26 @@ perl -e '$/ = undef; for (split(/\n/, <>)) { s:^ *///? ?::; print " <p>\n" if ! <!-------------------------------------------------------------------------- --> <h3> + <a name="bb-vectorize">-bb-vectorize: Basic-Block Vectorization</a> +</h3> +<div> + <p>This pass combines instructions inside basic blocks to form vector + instructions. It iterates over each basic block, attempting to pair + compatible instructions, repeating this process until no additional + pairs are selected for vectorization. When the outputs of some pair + of compatible instructions are used as inputs by some other pair of + compatible instructions, those pairs are part of a potential + vectorization chain. Instruction pairs are only fused into vector + instructions when they are part of a chain longer than some + threshold length. Moreover, the pass attempts to find the best + possible chain for each pair of compatible instructions. These + heuristics are intended to prevent vectorization in cases where + it would not yield a performance increase of the resulting code. + </p> +</div> + +<!-------------------------------------------------------------------------- --> +<h3> <a name="block-placement">-block-placement: Profile Guided Basic Block Placement</a> </h3> <div> @@ -2039,7 +2060,7 @@ if (X < 3) {</pre> <a href="mailto:rspencer@x10sys.com">Reid Spencer</a><br> <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br> - Last modified: $Date: 2011-11-04 07:30:50 +0100 (Fri, 04 Nov 2011) $ + Last modified: $Date: 2012-02-01 04:51:43 +0100 (Wed, 01 Feb 2012) $ </address> </body> |
