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3 Commits

Author SHA1 Message Date
Craig Topper e1c664b136 Add _lzcnt_u32 and _lzcnt_u64 to lzcntintrin.h to match Intel documentation names for these intrinsics. 
llvm-svn: 221066
 2014-11-01 22:50:57 +00:00
Craig Topper 3ca55d9c41 Avoid undefined behavior in the x86 lzcnt header file by explicitly checking for 0 before calling __builtin_clz. Without this the optimizers may take advantage of the undefined behavior and produce incorrect results. LLVM itself still needs to be taught to merge the zero check into the llvm.ctlz with defined zero behavior. 
llvm-svn: 221064
 2014-11-01 22:25:23 +00:00
Craig Topper f2855ade2b Add intrinsics for lzcnt and tzcnt instructions. 
llvm-svn: 147263
 2011-12-25 06:25:37 +00:00