[llvm] [SLP][REVEC] Make GetMinMaxCost support FixedVectorType when REVEC is enabled. (PR #115417)

[Han-Kuan Chen via llvm-commits]

https://github.com/HanKuanChen created https://github.com/llvm/llvm-project/pull/115417

reference: https://github.com/llvm/llvm-project/pull/114946

>From c145e701dbcb35f263a6f6594159f54dea45054a Mon Sep 17 00:00:00 2001
From: Han-Kuan Chen <hankuan.chen at sifive.com>
Date: Fri, 8 Nov 2024 00:52:59 +0800
Subject: [PATCH] [SLP][REVEC] Make GetMinMaxCost support FixedVectorType when
 REVEC is enabled. (#114946)

---
 .../Transforms/Vectorize/SLPVectorizer.cpp    |  3 +-
 .../Transforms/SLPVectorizer/RISCV/revec.ll   | 40 +++++++++++++++++++
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index b2f677fb84f983..bd8680d4c16638 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -10986,7 +10986,8 @@ BoUpSLP::getEntryCost(const TreeEntry *E, ArrayRef<Value *> VectorizedVals,
     // If the selects are the only uses of the compares, they will be
     // dead and we can adjust the cost by removing their cost.
     if (VI && SelectOnly) {
-      assert(!Ty->isVectorTy() && "Expected only for scalar type.");
+      assert((!Ty->isVectorTy() || SLPReVec) &&
+             "Expected only for scalar type.");
       auto *CI = cast<CmpInst>(VI->getOperand(0));
       IntrinsicCost -= TTI->getCmpSelInstrCost(
           CI->getOpcode(), Ty, Builder.getInt1Ty(), CI->getPredicate(),
diff --git a/llvm/test/Transforms/SLPVectorizer/RISCV/revec.ll b/llvm/test/Transforms/SLPVectorizer/RISCV/revec.ll
index 3d00ddf89aaa3b..b312688b7932dc 100644
--- a/llvm/test/Transforms/SLPVectorizer/RISCV/revec.ll
+++ b/llvm/test/Transforms/SLPVectorizer/RISCV/revec.ll
@@ -94,3 +94,43 @@ entry:
   %23 = fcmp ogt <8 x float> zeroinitializer, %19
   ret void
 }
+
+define void @test3(float %0) {
+; CHECK-LABEL: @test3(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[FOR_BODY_LR_PH:%.*]]
+; CHECK:       for.body.lr.ph:
+; CHECK-NEXT:    [[TMP1:%.*]] = call <4 x float> @llvm.vector.insert.v4f32.v2f32(<4 x float> poison, <2 x float> zeroinitializer, i64 0)
+; CHECK-NEXT:    [[TMP2:%.*]] = call <4 x float> @llvm.vector.insert.v4f32.v2f32(<4 x float> [[TMP1]], <2 x float> zeroinitializer, i64 2)
+; CHECK-NEXT:    br i1 false, label [[FOR_COND_CLEANUP:%.*]], label [[FOR_BODY:%.*]]
+; CHECK:       for.cond.cleanup:
+; CHECK-NEXT:    [[TMP3:%.*]] = phi <4 x float> [ [[TMP2]], [[FOR_BODY_LR_PH]] ], [ [[TMP10:%.*]], [[FOR_BODY]] ]
+; CHECK-NEXT:    ret void
+; CHECK:       for.body:
+; CHECK-NEXT:    [[TMP4:%.*]] = load <2 x float>, ptr null, align 4
+; CHECK-NEXT:    [[TMP5:%.*]] = fcmp olt <2 x float> zeroinitializer, [[TMP4]]
+; CHECK-NEXT:    [[TMP6:%.*]] = call <4 x i1> @llvm.vector.insert.v4i1.v2i1(<4 x i1> poison, <2 x i1> splat (i1 true), i64 0)
+; CHECK-NEXT:    [[TMP7:%.*]] = call <4 x i1> @llvm.vector.insert.v4i1.v2i1(<4 x i1> [[TMP6]], <2 x i1> [[TMP5]], i64 2)
+; CHECK-NEXT:    [[TMP8:%.*]] = call <4 x float> @llvm.vector.insert.v4f32.v2f32(<4 x float> poison, <2 x float> [[TMP4]], i64 0)
+; CHECK-NEXT:    [[TMP9:%.*]] = shufflevector <4 x float> [[TMP8]], <4 x float> poison, <4 x i32> <i32 0, i32 1, i32 0, i32 1>
+; CHECK-NEXT:    [[TMP10]] = select <4 x i1> [[TMP7]], <4 x float> [[TMP9]], <4 x float> [[TMP2]]
+; CHECK-NEXT:    br label [[FOR_COND_CLEANUP]]
+;
+entry:
+  br label %for.body.lr.ph
+
+for.body.lr.ph:
+  br i1 false, label %for.cond.cleanup, label %for.body
+
+for.cond.cleanup:                                 ; preds = %for.body, %for.body.lr.ph
+  %1 = phi <2 x float> [ zeroinitializer, %for.body.lr.ph ], [ %5, %for.body ]
+  %2 = phi <2 x float> [ zeroinitializer, %for.body.lr.ph ], [ %6, %for.body ]
+  ret void
+
+for.body:
+  %3 = load <2 x float>, ptr null, align 4
+  %4 = fcmp olt <2 x float> zeroinitializer, %3
+  %5 = select <2 x i1> <i1 true, i1 true>, <2 x float> %3, <2 x float> zeroinitializer
+  %6 = select <2 x i1> %4, <2 x float> %3, <2 x float> zeroinitializer
+  br label %for.cond.cleanup
+}