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add a note. Our 64-bit shifts are ~30% slower than gcc's

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30457 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2006-09-18 05:36:54 +00:00
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lib/Target/X86/README.txt
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@ -59,7 +59,8 @@ One better solution for 1LL << x is:
But that requires good 8-bit subreg support.
64-bit shifts (in general) expand to really bad code. Instead of using
cmovs, we should expand to a conditional branch like GCC produces.
//===---------------------------------------------------------------------===//