Skip to content
Commit 4ee5747f authored by Benjamin Kramer's avatar Benjamin Kramer
Browse files

ComputeMaskedBits: Make knownzero computation more aggressive for ctlz with undef zero. 

unsigned foo(unsigned x) { return 31 - __builtin_clz(x); }
now compiles into a single "bsrl" instruction on x86.

llvm-svn: 147255
parent 010337c8
Hide whitespace changes
Inline Side-by-side
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment