bench: split Realistic into 20% and 40% quoted variants

benchmark_test.go

@@ -139,12 +139,36 @@ func BenchmarkReadAll_Quoted_100K_SIMD(b *testing.B) {
 	}
 }
 
+// =============================================================================
+// ReadAll Benchmarks - Realistic CSV (20% quoted)
+// =============================================================================
+
+func BenchmarkReadAll_Realistic20_100K_Stdlib(b *testing.B) {
+	data := generateRealistic20CSV(100000, 10)
+	b.SetBytes(int64(len(data)))
+	for b.Loop() {
+		reader := csv.NewReader(bytes.NewReader(data))
+		reader.FieldsPerRecord = -1
+		_, _ = reader.ReadAll()
+	}
+}
+
+func BenchmarkReadAll_Realistic20_100K_SIMD(b *testing.B) {
+	data := generateRealistic20CSV(100000, 10)
+	b.SetBytes(int64(len(data)))
+	for b.Loop() {
+		reader := NewReader(bytes.NewReader(data))
+		reader.FieldsPerRecord = -1
+		_, _ = reader.ReadAll()
+	}
+}
+
 // =============================================================================
 // ReadAll Benchmarks - Realistic CSV (40% quoted)
 // =============================================================================
 
-func BenchmarkReadAll_Realistic_100K_Stdlib(b *testing.B) {
-	data := generateRealisticCSV(100000, 10)
+func BenchmarkReadAll_Realistic40_100K_Stdlib(b *testing.B) {
+	data := generateRealistic40CSV(100000, 10)
 	b.SetBytes(int64(len(data)))
 	for b.Loop() {
 		reader := csv.NewReader(bytes.NewReader(data))
@@ -153,8 +177,8 @@ func BenchmarkReadAll_Realistic_100K_Stdlib(b *testing.B) {
 	}
 }
 
-func BenchmarkReadAll_Realistic_100K_SIMD(b *testing.B) {
-	data := generateRealisticCSV(100000, 10)
+func BenchmarkReadAll_Realistic40_100K_SIMD(b *testing.B) {
+	data := generateRealistic40CSV(100000, 10)
 	b.SetBytes(int64(len(data)))
 	for b.Loop() {
 		reader := NewReader(bytes.NewReader(data))

test_helpers_test.go

@@ -203,11 +203,22 @@ func generateEscapedQuotesCSV(numRows, numCols int) []byte {
 	return buf.Bytes()
 }
 
-// generateRealisticCSV generates CSV with 4/10 quoted fields containing commas (~40%).
+// generateRealistic20CSV generates CSV with 2/10 quoted fields containing commas (~20%).
+// Row template: "Alice, Smith",30,Tokyo,engineer,100,Japan,active,42,"New York, US",2024
+// Cols 0,8 are quoted.
+func generateRealistic20CSV(numRows, _ int) []byte {
+	var buf bytes.Buffer
+	for i := 0; i < numRows; i++ {
+		buf.WriteString(`"Alice, Smith",30,Tokyo,engineer,100,Japan,active,42,"New York, US",2024`)
+		buf.WriteByte('\n')
+	}
+	return buf.Bytes()
+}
+
+// generateRealistic40CSV generates CSV with 4/10 quoted fields containing commas (~40%).
 // Row template: "Alice, Smith",30,"Tokyo, JP",engineer,100,"Japan, Asia",active,42,"New York, US",2024
-// Cols 0,2,5,8 are quoted; this exercises the prefixXOR / PCLMULQDQ hot path
-// without the all-quoted overhead.
-func generateRealisticCSV(numRows, _ int) []byte {
+// Cols 0,2,5,8 are quoted.
+func generateRealistic40CSV(numRows, _ int) []byte {
 	var buf bytes.Buffer
 	for i := 0; i < numRows; i++ {
 		buf.WriteString(`"Alice, Smith",30,"Tokyo, JP",engineer,100,"Japan, Asia",active,42,"New York, US",2024`)
@@ -275,18 +286,3 @@ func generateEscapedQuotesRecords(numRows, numCols int) [][]string {
 	}
 	return records
 }
-
-// generateRealisticRecords returns records matching generateRealisticCSV.
-func generateRealisticRecords(numRows, _ int) [][]string {
-	template := []string{
-		"Alice, Smith", "30", "Tokyo, JP", "engineer",
-		"100", "Japan, Asia", "active", "42", "New York, US", "2024",
-	}
-	records := make([][]string, numRows)
-	for i := range records {
-		row := make([]string, len(template))
-		copy(row, template)
-		records[i] = row
-	}
-	return records
-}