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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30285 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner
2006-09-13 03:54:54 +00:00
parent 79980b07da
commit 95af34e33f
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lib/Target/X86/README.txt
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@@ -45,6 +45,19 @@ http://gcc.gnu.org/ml/gcc-patches/2004-09/msg01136.html
Another useful one would be ~0ULL >> X and ~0ULL << X. Another useful one would be ~0ULL >> X and ~0ULL << X.
One better solution for 1LL << x is:
xorl %eax, %eax
xorl %edx, %edx
testb $32, %cl
sete %al
setne %dl
sall %cl, %eax
sall %cl, %edx
But that requires good 8-bit subreg support.
//===---------------------------------------------------------------------===// //===---------------------------------------------------------------------===//
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