[llvm] r332770 - [InstCombine] Qualify a select pattern based transform to restrct to only min/max and ignore abs/nabs.

[Craig Topper via llvm-commits]

Author: ctopper
Date: Fri May 18 14:21:56 2018
New Revision: 332770

URL: http://llvm.org/viewvc/llvm-project?rev=332770&view=rev
Log:
[InstCombine] Qualify a select pattern based transform to restrct to only min/max and ignore abs/nabs.

Modified:
    llvm/trunk/lib/Transforms/InstCombine/InstCombineSelect.cpp

Modified: llvm/trunk/lib/Transforms/InstCombine/InstCombineSelect.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/InstCombine/InstCombineSelect.cpp?rev=332770&r1=332769&r2=332770&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstCombineSelect.cpp (original)
+++ llvm/trunk/lib/Transforms/InstCombine/InstCombineSelect.cpp Fri May 18 14:21:56 2018
@@ -938,7 +938,7 @@ Instruction *InstCombiner::foldSPFofSPF(
   if (C == A || C == B) {
     // MAX(MAX(A, B), B) -> MAX(A, B)
     // MIN(MIN(a, b), a) -> MIN(a, b)
-    if (SPF1 == SPF2)
+    if (SPF1 == SPF2 && SelectPatternResult::isMinOrMax(SPF1))
       return replaceInstUsesWith(Outer, Inner);
 
     // MAX(MIN(a, b), a) -> a