1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
#[cfg(test)]
mod tests {
use super::*;
// =========================================================================
// f16_to_f32 edge cases
// =========================================================================
#[test]
fn test_f16_positive_zero() {
let result = f16_to_f32(0x0000);
assert_eq!(result, 0.0);
assert!(result.is_sign_positive());
}
#[test]
fn test_f16_negative_zero() {
let result = f16_to_f32(0x8000);
assert_eq!(result, 0.0);
assert!(result.is_sign_negative());
}
#[test]
fn test_f16_positive_infinity() {
let result = f16_to_f32(0x7C00);
assert!(result.is_infinite());
assert!(result.is_sign_positive());
}
#[test]
fn test_f16_negative_infinity() {
let result = f16_to_f32(0xFC00);
assert!(result.is_infinite());
assert!(result.is_sign_negative());
}
#[test]
fn test_f16_nan() {
// NaN has exp=31 and non-zero mantissa
let result = f16_to_f32(0x7C01);
assert!(result.is_nan());
}
#[test]
fn test_f16_subnormal() {
// Smallest subnormal: 0x0001 = 2^-24 ~= 5.96e-8
let result = f16_to_f32(0x0001);
assert!(result > 0.0);
assert!(result < 1e-4);
}
#[test]
fn test_f16_normal_one() {
// f16 representation of 1.0 = 0x3C00
let result = f16_to_f32(0x3C00);
assert!((result - 1.0).abs() < 1e-6);
}
#[test]
fn test_f16_normal_negative() {
// f16 representation of -1.0 = 0xBC00
let result = f16_to_f32(0xBC00);
assert!((result - (-1.0)).abs() < 1e-6);
}
// =========================================================================
// Dequantize Q4_0
// =========================================================================
#[test]
fn test_dequantize_q4_0_basic() {
// Build a minimal Q4_0 block: 2 bytes scale + 16 bytes data = 18 bytes per block of 32
let mut data = vec![0u8; 18];
// Scale = 1.0 in f16 = 0x3C00
data[0] = 0x00;
data[1] = 0x3C;
// Fill 16 quant bytes with 0x88 (both nibbles = 8, so value = 8-8 = 0)
for i in 2..18 {
data[i] = 0x88;
}
let result = dequantize_q4_0(&data, 0, 32).expect("should succeed");
assert_eq!(result.len(), 32);
// All values should be 0 (quant value 8 - 8 = 0, scaled by 1.0)
for v in &result {
assert!(v.abs() < 1e-6, "Expected ~0.0 but got {v}");
}
}
#[test]
fn test_dequantize_q4_0_exceeds_file_size() {
let data = vec![0u8; 10]; // Too small for 1 block (needs 18 bytes)
let result = dequantize_q4_0(&data, 0, 32);
assert!(result.is_err());
}
#[test]
fn test_dequantize_q4_0_partial_block() {
// Request fewer elements than a full block
let mut data = vec![0u8; 18];
data[0] = 0x00;
data[1] = 0x3C;
let result = dequantize_q4_0(&data, 0, 16).expect("should succeed");
assert_eq!(result.len(), 16);
}
// =========================================================================
// Dequantize Q8_0
// =========================================================================
#[test]
fn test_dequantize_q8_0_basic() {
// Build Q8_0 block: 2 bytes scale + 32 bytes data = 34 bytes
let mut data = vec![0u8; 34];
// Scale = 1.0 in f16
data[0] = 0x00;
data[1] = 0x3C;
// All quant bytes = 0 (int8 value 0)
let result = dequantize_q8_0(&data, 0, 32).expect("should succeed");
assert_eq!(result.len(), 32);
for v in &result {
assert!(v.abs() < 1e-6);
}
}
#[test]
fn test_dequantize_q8_0_exceeds_file_size() {
let data = vec![0u8; 10];
let result = dequantize_q8_0(&data, 0, 32);
assert!(result.is_err());
}
// =========================================================================
// Dequantize Q5_0
// =========================================================================
#[test]
fn test_dequantize_q5_0_basic() {
// Q5_0 block: 2 + 4 + 16 = 22 bytes
let data = vec![0u8; 22];
let result = dequantize_q5_0(&data, 0, 32).expect("should succeed");
assert_eq!(result.len(), 32);
}
#[test]
fn test_dequantize_q5_0_exceeds_file_size() {
let data = vec![0u8; 10];
let result = dequantize_q5_0(&data, 0, 32);
assert!(result.is_err());
}
// =========================================================================
// Dequantize Q5_1
// =========================================================================
#[test]
fn test_dequantize_q5_1_basic() {
// Q5_1 block: 2 + 2 + 4 + 16 = 24 bytes
let data = vec![0u8; 24];
let result = dequantize_q5_1(&data, 0, 32).expect("should succeed");
assert_eq!(result.len(), 32);
}
#[test]
fn test_dequantize_q5_1_exceeds_file_size() {
let data = vec![0u8; 10];
let result = dequantize_q5_1(&data, 0, 32);
assert!(result.is_err());
}
// =========================================================================
// Dequantize Q4_K
// =========================================================================
#[test]
fn test_dequantize_q4_k_basic() {
// Q4_K block: 2 + 2 + 12 + 128 = 144 bytes
let data = vec![0u8; 144];
let result = dequantize_q4_k(&data, 0, 256).expect("should succeed");
assert_eq!(result.len(), 256);
}
#[test]
fn test_dequantize_q4_k_exceeds_file_size() {
let data = vec![0u8; 100];
let result = dequantize_q4_k(&data, 0, 256);
assert!(result.is_err());
}
// =========================================================================
// Dequantize Q5_K
// =========================================================================
#[test]
fn test_dequantize_q5_k_basic() {
// Q5_K block: 2 + 2 + 12 + 32 + 128 = 176 bytes
let data = vec![0u8; 176];
let result = dequantize_q5_k(&data, 0, 256).expect("should succeed");
assert_eq!(result.len(), 256);
}
#[test]
fn test_dequantize_q5_k_exceeds_file_size() {
let data = vec![0u8; 100];
let result = dequantize_q5_k(&data, 0, 256);
assert!(result.is_err());
}
// =========================================================================
// Dequantize Q6_K
// =========================================================================
#[test]
fn test_dequantize_q6_k_basic() {
// Q6_K block: 128 + 64 + 16 + 2 = 210 bytes
let data = vec![0u8; 210];
let result = dequantize_q6_k(&data, 0, 256).expect("should succeed");
assert_eq!(result.len(), 256);
}
#[test]
fn test_dequantize_q6_k_exceeds_file_size() {
let data = vec![0u8; 100];
let result = dequantize_q6_k(&data, 0, 256);
assert!(result.is_err());
}
// =========================================================================
// Dequantize Q4_1
// =========================================================================
#[test]
fn test_dequantize_q4_1_basic() {
// Q4_1 block: 2 + 2 + 16 = 20 bytes
let data = vec![0u8; 20];
let result = dequantize_q4_1(&data, 0, 32).expect("should succeed");
assert_eq!(result.len(), 32);
}
#[test]
fn test_dequantize_q4_1_exceeds_file_size() {
let data = vec![0u8; 10];
let result = dequantize_q4_1(&data, 0, 32);
assert!(result.is_err());
}
// =========================================================================
// Dequantize Q2_K
// =========================================================================
#[test]
fn test_dequantize_q2_k_basic() {
// Q2_K block: 2 + 2 + 16 + 64 = 84 bytes
let data = vec![0u8; 84];
let result = dequantize_q2_k(&data, 0, 256).expect("should succeed");
assert_eq!(result.len(), 256);
}
#[test]
fn test_dequantize_q2_k_exceeds_file_size() {
let data = vec![0u8; 50];
let result = dequantize_q2_k(&data, 0, 256);
assert!(result.is_err());
}
// =========================================================================
// Dequantize Q3_K
// =========================================================================
#[test]
fn test_dequantize_q3_k_basic() {
// Q3_K block: 32 + 64 + 12 + 2 = 110 bytes
let data = vec![0u8; 110];
let result = dequantize_q3_k(&data, 0, 256).expect("should succeed");
assert_eq!(result.len(), 256);
}
#[test]
fn test_dequantize_q3_k_exceeds_file_size() {
let data = vec![0u8; 50];
let result = dequantize_q3_k(&data, 0, 256);
assert!(result.is_err());
}
// =========================================================================
// Dequantize IQ approximate
// =========================================================================
#[test]
fn test_dequantize_iq_approximate_iq2() {
let data = vec![128u8; 1024];
let result = dequantize_iq_approximate(&data, 0, 64, 13); // IQ2_XXS
assert_eq!(result.len(), 64);
}
#[test]
fn test_dequantize_iq_approximate_iq3() {
let data = vec![128u8; 1024];
let result = dequantize_iq_approximate(&data, 0, 64, 16); // IQ3_XXS
assert_eq!(result.len(), 64);
}
#[test]
fn test_dequantize_iq_approximate_iq1() {
let data = vec![128u8; 1024];
let result = dequantize_iq_approximate(&data, 0, 64, 18); // IQ1_S
assert_eq!(result.len(), 64);
}
#[test]
fn test_dequantize_iq_approximate_default_dtype() {
let data = vec![128u8; 1024];
let result = dequantize_iq_approximate(&data, 0, 64, 99); // Unknown dtype
assert_eq!(result.len(), 64);
}
#[test]
fn test_dequantize_iq_approximate_byte_out_of_range() {
// Small data so byte_idx exceeds data.len()
let data = vec![128u8; 4];
let result = dequantize_iq_approximate(&data, 0, 256, 13);
// Should still produce 256 elements (some will be 0.0 for out-of-range bytes)
assert_eq!(result.len(), 256);
// Verify some elements are 0.0 (from the byte_idx >= data.len() path)
assert!(result.iter().any(|&v| v == 0.0));
}
#[test]
fn test_dequantize_q4_0_with_nonzero_start() {
// 18 bytes padding + 18 bytes block; put scale at offset 18
let mut data = vec![0u8; 36];
data[18] = 0x00;
data[19] = 0x3C;
let result = dequantize_q4_0(&data, 18, 32).expect("should succeed");
assert_eq!(result.len(), 32);
}
// =========================================================================
// GH-186: safe_f16_scale NaN/Inf/subnormal clamping
// =========================================================================
#[test]
fn test_safe_f16_scale_normal() {
// 1.0 in f16 = 0x3C00
assert!((safe_f16_scale(0x3C00) - 1.0).abs() < 1e-3);
// 2.0 in f16 = 0x4000
assert!((safe_f16_scale(0x4000) - 2.0).abs() < 1e-3);
// -1.0 in f16 = 0xBC00
assert!((safe_f16_scale(0xBC00) - (-1.0)).abs() < 1e-3);
}
#[test]
fn test_safe_f16_scale_nan_clamped() {
// NaN in f16: exp=31, mantissa!=0 → 0x7E00
assert_eq!(safe_f16_scale(0x7E00), 0.0);
// Another NaN pattern
assert_eq!(safe_f16_scale(0x7C01), 0.0);
}
#[test]
fn test_safe_f16_scale_inf_clamped() {
// +Inf in f16: 0x7C00
assert_eq!(safe_f16_scale(0x7C00), 0.0);
// -Inf in f16: 0xFC00
assert_eq!(safe_f16_scale(0xFC00), 0.0);
}
#[test]
fn test_safe_f16_scale_subnormal_preserved() {
// PMAT-238: Subnormals are now PRESERVED (valid Q6_K scale factors)
// Smallest subnormal: 0x0001 → ~5.96e-8
assert!(safe_f16_scale(0x0001) > 0.0);
// Largest subnormal: 0x03FF → ~6.09e-5
assert!(safe_f16_scale(0x03FF) > 0.0);
}
#[test]
fn test_safe_f16_scale_zero_preserved() {
// Positive zero
assert_eq!(safe_f16_scale(0x0000), 0.0);
// Negative zero - abs(0.0) < F16_MIN_NORMAL so clamped to 0.0
assert_eq!(safe_f16_scale(0x8000), 0.0);
}
#[test]
fn test_gh186_nan_does_not_propagate_q4_0() {
// Build a Q4_0 block with NaN scale (0x7E00)
let mut data = vec![0u8; 18]; // 2-byte scale + 16-byte quants
data[0] = 0x00; // NaN f16 = 0x7E00 (little-endian: 0x00, 0x7E)
data[1] = 0x7E;
// Fill quants with non-zero data
for i in 2..18 {
data[i] = 0x55; // non-zero nibbles
}
let result = dequantize_q4_0(&data, 0, 32).expect("should succeed");
// With NaN clamping, all values should be finite (0.0 * anything = 0.0)
assert!(
result.iter().all(|v| v.is_finite()),
"GH-186: NaN scale should not propagate to output"
);
}
#[test]
fn test_gh186_nan_does_not_propagate_q4_k() {
// Build a Q4_K block with NaN scale
// Q4_K block: 4 bytes (d+dmin) + 12 bytes (scales) + 128 bytes (quants) = 144 bytes
let mut data = vec![0u8; 144];
data[0] = 0x00; // d = NaN f16 = 0x7E00 (LE)
data[1] = 0x7E;
data[2] = 0x00; // dmin = NaN
data[3] = 0x7E;
// Fill scales and quants with non-zero
for i in 4..144 {
data[i] = 0x33;
}
let result = dequantize_q4_k(&data, 0, 256).expect("should succeed");
assert!(
result.iter().all(|v| v.is_finite()),
"GH-186: NaN scale should not propagate to Q4_K output"
);
}
}