diff --git a/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h b/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
--- a/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
+++ b/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
@@ -81,7 +81,7 @@
                              TTI::PeelingPreferences &PP);
 
   unsigned getMinVectorRegisterBitWidth() const {
-    return ST->hasVInstructions() ? ST->getMinRVVVectorSizeInBits() : 0;
+    return ST->useRVVForFixedLengthVectors() ? 16 : 0;
   }
 
   InstructionCost getGatherScatterOpCost(unsigned Opcode, Type *DataTy,
diff --git a/llvm/test/Transforms/SLPVectorizer/RISCV/lit.local.cfg b/llvm/test/Transforms/SLPVectorizer/RISCV/lit.local.cfg
new file mode 100644
--- /dev/null
+++ b/llvm/test/Transforms/SLPVectorizer/RISCV/lit.local.cfg
@@ -0,0 +1,2 @@
+if not 'RISCV' in config.root.targets:
+    config.unsupported = True
diff --git a/llvm/test/Transforms/SLPVectorizer/RISCV/rvv-min-vector-size.ll b/llvm/test/Transforms/SLPVectorizer/RISCV/rvv-min-vector-size.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/Transforms/SLPVectorizer/RISCV/rvv-min-vector-size.ll
@@ -0,0 +1,68 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -slp-vectorizer -mtriple=riscv64 -mattr=+experimental-v \
+; RUN: -riscv-v-vector-bits-min=128 -S | FileCheck %s --check-prefixes=CHECK,CHECK-128
+; RUN: opt < %s -slp-vectorizer -mtriple=riscv64 -mattr=+experimental-v \
+; RUN: -riscv-v-vector-bits-min=256 -S | FileCheck %s --check-prefixes=CHECK,CHECK-256
+; RUN: opt < %s -slp-vectorizer -mtriple=riscv64 -mattr=+experimental-v \
+; RUN: -riscv-v-vector-bits-min=512 -S | FileCheck %s --check-prefixes=CHECK,CHECK-512
+
+target datalayout = "e-m:e-p:64:64-i64:64-i128:128-n64-S128"
+target triple = "riscv64"
+
+define void @foo(i64* nocapture writeonly %da) {
+; CHECK-128-LABEL: @foo(
+; CHECK-128-NEXT:  entry:
+; CHECK-128-NEXT:    [[ARRAYIDX1:%.*]] = getelementptr inbounds i64, i64* [[DA:%.*]], i64 1
+; CHECK-128-NEXT:    [[TMP0:%.*]] = bitcast i64* [[DA]] to <2 x i64>*
+; CHECK-128-NEXT:    store <2 x i64> <i64 0, i64 1>, <2 x i64>* [[TMP0]], align 8
+; CHECK-128-NEXT:    [[ARRAYIDX2:%.*]] = getelementptr inbounds i64, i64* [[DA]], i64 2
+; CHECK-128-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr inbounds i64, i64* [[DA]], i64 3
+; CHECK-128-NEXT:    [[TMP1:%.*]] = bitcast i64* [[ARRAYIDX2]] to <2 x i64>*
+; CHECK-128-NEXT:    store <2 x i64> <i64 2, i64 3>, <2 x i64>* [[TMP1]], align 8
+; CHECK-128-NEXT:    ret void
+;
+; CHECK-256-LABEL: @foo(
+; CHECK-256-NEXT:  entry:
+; CHECK-256-NEXT:    [[ARRAYIDX1:%.*]] = getelementptr inbounds i64, i64* [[DA:%.*]], i64 1
+; CHECK-256-NEXT:    [[ARRAYIDX2:%.*]] = getelementptr inbounds i64, i64* [[DA]], i64 2
+; CHECK-256-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr inbounds i64, i64* [[DA]], i64 3
+; CHECK-256-NEXT:    [[TMP0:%.*]] = bitcast i64* [[DA]] to <4 x i64>*
+; CHECK-256-NEXT:    store <4 x i64> <i64 0, i64 1, i64 2, i64 3>, <4 x i64>* [[TMP0]], align 8
+; CHECK-256-NEXT:    ret void
+;
+; CHECK-512-LABEL: @foo(
+; CHECK-512-NEXT:  entry:
+; CHECK-512-NEXT:    [[ARRAYIDX1:%.*]] = getelementptr inbounds i64, i64* [[DA:%.*]], i64 1
+; CHECK-512-NEXT:    [[ARRAYIDX2:%.*]] = getelementptr inbounds i64, i64* [[DA]], i64 2
+; CHECK-512-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr inbounds i64, i64* [[DA]], i64 3
+; CHECK-512-NEXT:    [[TMP0:%.*]] = bitcast i64* [[DA]] to <4 x i64>*
+; CHECK-512-NEXT:    store <4 x i64> <i64 0, i64 1, i64 2, i64 3>, <4 x i64>* [[TMP0]], align 8
+; CHECK-512-NEXT:    ret void
+;
+entry:
+  store i64 0, i64* %da, align 8
+  %arrayidx1 = getelementptr inbounds i64, i64* %da, i64 1
+  store i64 1, i64* %arrayidx1, align 8
+  %arrayidx2 = getelementptr inbounds i64, i64* %da, i64 2
+  store i64 2, i64* %arrayidx2, align 8
+  %arrayidx3 = getelementptr inbounds i64, i64* %da, i64 3
+  store i64 3, i64* %arrayidx3, align 8
+  ret void
+}
+
+define void @foo8(i8* nocapture writeonly %da) {
+; CHECK-LABEL: @foo8(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[ARRAYIDX1:%.*]] = getelementptr inbounds i8, i8* [[DA:%.*]], i8 1
+; CHECK-NEXT:    [[TMP0:%.*]] = bitcast i8* [[DA]] to <2 x i8>*
+; CHECK-NEXT:    store <2 x i8> <i8 0, i8 1>, <2 x i8>* [[TMP0]], align 8
+; CHECK-NEXT:    [[ARRAYIDX2:%.*]] = getelementptr inbounds i8, i8* [[DA]], i8 2
+; CHECK-NEXT:    ret void
+;
+entry:
+  store i8 0, i8* %da, align 8
+  %arrayidx1 = getelementptr inbounds i8, i8* %da, i8 1
+  store i8 1, i8* %arrayidx1, align 8
+  %arrayidx2 = getelementptr inbounds i8, i8* %da, i8 2
+  ret void
+}