[Utils] reduce code in createTargetReduction(); NFC

The switch duplicated the translation in getRecurrenceBinOp().
This code is still weird because it translates to the TTI
ReductionFlags for min/max, but then createSimpleTargetReduction()
converts that back to RecurrenceDescriptor::MinMaxRecurrenceKind.

1 files changed, 6 insertions, 29 deletions

diff --git a/llvm/lib/Transforms/Utils/LoopUtils.cpp b/llvm/lib/Transforms/Utils/LoopUtils.cpp
index 1ac2708..653680e 100644
--- a/llvm/lib/Transforms/Utils/LoopUtils.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUtils.cpp
@@ -1063,7 +1063,6 @@ Value *llvm::createTargetReduction(IRBuilderBase &B,
                                    bool NoNaN) {
   // TODO: Support in-order reductions based on the recurrence descriptor.
   using RD = RecurrenceDescriptor;
-  RD::RecurrenceKind RecKind = Desc.getRecurrenceKind();
   TargetTransformInfo::ReductionFlags Flags;
   Flags.NoNaN = NoNaN;
 
@@ -1072,34 +1071,12 @@ Value *llvm::createTargetReduction(IRBuilderBase &B,
   IRBuilderBase::FastMathFlagGuard FMFGuard(B);
   B.setFastMathFlags(Desc.getFastMathFlags());
 
-  switch (RecKind) {
-  case RD::RK_FloatAdd:
-    return createSimpleTargetReduction(B, TTI, Instruction::FAdd, Src, Flags);
-  case RD::RK_FloatMult:
-    return createSimpleTargetReduction(B, TTI, Instruction::FMul, Src, Flags);
-  case RD::RK_IntegerAdd:
-    return createSimpleTargetReduction(B, TTI, Instruction::Add, Src, Flags);
-  case RD::RK_IntegerMult:
-    return createSimpleTargetReduction(B, TTI, Instruction::Mul, Src, Flags);
-  case RD::RK_IntegerAnd:
-    return createSimpleTargetReduction(B, TTI, Instruction::And, Src, Flags);
-  case RD::RK_IntegerOr:
-    return createSimpleTargetReduction(B, TTI, Instruction::Or, Src, Flags);
-  case RD::RK_IntegerXor:
-    return createSimpleTargetReduction(B, TTI, Instruction::Xor, Src, Flags);
-  case RD::RK_IntegerMinMax: {
-    RD::MinMaxRecurrenceKind MMKind = Desc.getMinMaxRecurrenceKind();
-    Flags.IsMaxOp = (MMKind == RD::MRK_SIntMax || MMKind == RD::MRK_UIntMax);
-    Flags.IsSigned = (MMKind == RD::MRK_SIntMax || MMKind == RD::MRK_SIntMin);
-    return createSimpleTargetReduction(B, TTI, Instruction::ICmp, Src, Flags);
-  }
-  case RD::RK_FloatMinMax: {
-    Flags.IsMaxOp = Desc.getMinMaxRecurrenceKind() == RD::MRK_FloatMax;
-    return createSimpleTargetReduction(B, TTI, Instruction::FCmp, Src, Flags);
-  }
-  default:
-    llvm_unreachable("Unhandled RecKind");
-  }
+  RD::MinMaxRecurrenceKind MMKind = Desc.getMinMaxRecurrenceKind();
+  Flags.IsMaxOp = MMKind == RD::MRK_SIntMax || MMKind == RD::MRK_UIntMax ||
+                  MMKind == RD::MRK_FloatMax;
+  Flags.IsSigned = MMKind == RD::MRK_SIntMax || MMKind == RD::MRK_SIntMin;
+  return createSimpleTargetReduction(B, TTI, Desc.getRecurrenceBinOp(), Src,
+                                     Flags);
 }
 
 void llvm::propagateIRFlags(Value *I, ArrayRef<Value *> VL, Value *OpValue) {