| commit | 8d96964e29e737b597e31af04db14570b87c6346 | [log] [tgz] |
|---|---|---|
| author | Chris Lattner <sabre@nondot.org> | Mon Mar 10 23:06:50 2003 +0000 |
| committer | Chris Lattner <sabre@nondot.org> | Mon Mar 10 23:06:50 2003 +0000 |
| tree | 0e72338b831bc5b55880770dc08c0228ca8e6cc0 | |
| parent | 1b77300154ca8cbf1594475712811228f898149c [diff] |
Generalize not and neg comparison testers to allow constant to be considered not'able and neg'able. This
allows optimization of this:
int %test4(int %A, int %B) {
%a = xor int %A, -1
%c = and int %a, 5 ; 5 = ~c2
%d = xor int %c, -1
ret int %d
}
into this:
int %test4(int %A, int %B) { ; No predecessors!
%c.demorgan = or int %A, -6 ; <int> [#uses=1]
ret int %c.demorgan
}
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5736 91177308-0d34-0410-b5e6-96231b3b80d8