Changes in directory llvm/lib/Target/X86:
README.txt updated: 1.130 -> 1.131 --- Log message: new note --- Diffs of the changes: (+13 -0) README.txt | 13 +++++++++++++ 1 files changed, 13 insertions(+) Index: llvm/lib/Target/X86/README.txt diff -u llvm/lib/Target/X86/README.txt:1.130 llvm/lib/Target/X86/README.txt:1.131 --- llvm/lib/Target/X86/README.txt:1.130 Tue Sep 12 22:22:10 2006 +++ llvm/lib/Target/X86/README.txt Tue Sep 12 22:54:54 2006 @@ -45,6 +45,19 @@ 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. + + + //===---------------------------------------------------------------------===// Compile this: _______________________________________________ llvm-commits mailing list llvm-commits@cs.uiuc.edu http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
