[EarlyCSE] Simplify max/min pattern matching. NFC.

llvm · Sep 16, 2020 · 4e4c89b · 4e4c89b
1 parent 0c6a56e
commit 4e4c89b
Showing 1 changed file with 9 additions and 18 deletions.
diff --git a/llvm/lib/Transforms/Scalar/EarlyCSE.cpp b/llvm/lib/Transforms/Scalar/EarlyCSE.cpp
@@ -191,25 +191,16 @@ static bool matchSelectWithOptionalNotCond(Value *V, Value *&Cond, Value *&A,
     Pred = ICmpInst::getSwappedPredicate(Pred);
   }
 
-  // Check for inverted variants of min/max by swapping operands.
-  bool Inversed = false;
   switch (Pred) {
-  case CmpInst::ICMP_ULE:
-  case CmpInst::ICMP_UGE:
-  case CmpInst::ICMP_SLE:
-  case CmpInst::ICMP_SGE:
-    Pred = CmpInst::getInversePredicate(Pred);
-    Inversed = true;
-    break;
-  default:
-    break;
-  }
-
-  switch (Pred) {
-  case CmpInst::ICMP_UGT: Flavor = Inversed ? SPF_UMIN : SPF_UMAX; break;
-  case CmpInst::ICMP_ULT: Flavor = Inversed ? SPF_UMAX : SPF_UMIN; break;
-  case CmpInst::ICMP_SGT: Flavor = Inversed ? SPF_SMIN : SPF_SMAX; break;
-  case CmpInst::ICMP_SLT: Flavor = Inversed ? SPF_SMAX : SPF_SMIN; break;
+  case CmpInst::ICMP_UGT: Flavor = SPF_UMAX; break;
+  case CmpInst::ICMP_ULT: Flavor = SPF_UMIN; break;
+  case CmpInst::ICMP_SGT: Flavor = SPF_SMAX; break;
+  case CmpInst::ICMP_SLT: Flavor = SPF_SMIN; break;
+  // Non-strict inequalities.
+  case CmpInst::ICMP_ULE: Flavor = SPF_UMIN; break;
+  case CmpInst::ICMP_UGE: Flavor = SPF_UMAX; break;
+  case CmpInst::ICMP_SLE: Flavor = SPF_SMIN; break;
+  case CmpInst::ICMP_SGE: Flavor = SPF_SMAX; break;
   default: break;
   }