commit 5337f20c1516296edcea6bc3da6cdc74329142ae
author Benjamin Kramer <benny.kra@googlemail.com> Mon Dec 20 16:18:51 2010 +0000
committer Benjamin Kramer <benny.kra@googlemail.com> Mon Dec 20 16:18:51 2010 +0000
tree b344d60db4184b58df32d4eac9a14c511f07601c
parent 67e0c212c25f478e4c2ac6c8e9c50cce028fb79c

Teach InstCombine to merge (icmp ult (X + CA), C1) | (icmp eq X, C2) into (icmp ult (X + CA), C1 + 1) if C2 + CA == C1.

InstCombine creates these so now we compile x == 23 || x == 24 || x == 25 to
  %x.off = add i32 %x, -23
  %1 = icmp ult i32 %x.off, 3
instead of
  %x.off = add i32 %x, -23
  %1 = icmp ult i32 %x.off, 2
  %cmp3 = icmp eq i32 %x, 25
  %ret2 = or i1 %1, %cmp3


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122248 91177308-0d34-0410-b5e6-96231b3b80d8