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authorChris Lattner <sabre@nondot.org>2010-10-04 16:46:07 +0000
committerChris Lattner <sabre@nondot.org>2010-10-04 16:46:07 +0000
commitb822f659fcab2423ca2fe073bb663b1cfb75f505 (patch)
tree0b0209b0b2ed0478e087425cbe36c2689fe98e3a /docs/ReleaseNotes.html
parentc5fd15628f8d034acbb16e7a57c410d931cae597 (diff)
downloadexternal_llvm-b822f659fcab2423ca2fe073bb663b1cfb75f505.zip
external_llvm-b822f659fcab2423ca2fe073bb663b1cfb75f505.tar.gz
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scheduler update
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115515 91177308-0d34-0410-b5e6-96231b3b80d8
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@@ -734,12 +734,11 @@ it run faster:</p>
is available from a previous instruction.</li>
<li>Atomic operations now get legalized into simpler atomic operations if not
natively supported, easing the implementation burden on targets.</li>
-<li>The bottom-up pre-allocation scheduler is now register pressure aware,
- allowing it to avoid overscheduling in high pressure situations while still
- aggressively scheduling when registers are available.</li>
-<li>A new instruction-level-parallelism pre-allocation scheduler is available,
- which is also register pressure aware. This scheduler has shown substantial
- wins on X86-64 and is on by default.</li>
+<li>We have added two new bottom-up pre-allocation register pressure aware schedulers:
+<ol>
+<li>The hybrid scheduler schedules aggressively to minimize schedule length when registers are available and avoid overscheduling in high pressure situations.</li>
+<li>The instruction-level-parallelism scheduler schedules for maximum ILP when registers are available and avoid overscheduling in high pressure situations.</li>
+</ol></li>
<li>The tblgen type inference algorithm was rewritten to be more consistent and
diagnose more target bugs. If you have an out-of-tree backend, you may
find that it finds bugs in your target description. This support also