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Added an idea about any_extend for performance tuning.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24763 91177308-0d34-0410-b5e6-96231b3b80d8
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Evan Cheng
2005-12-17 06:54:43 +00:00
parent 0d8fcd3218
commit 98abbfb2ef
1 changed files with 5 additions and 0 deletions
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lib/Target/X86/README.txt
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@@ -102,3 +102,8 @@ Some isel ideas:
//===---------------------------------------------------------------------===//
Should we promote i16 to i32 to avoid partial register update stalls?
//===---------------------------------------------------------------------===//
Leave any_extend as pseudo instruction and hint to register
allocator. Delay codegen until post register allocation.