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Fix conversion to float 8 when uz is True#53

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Merged
sdpython merged 1 commit intomainfromf88
Nov 20, 2023
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1 change: 1 addition & 0 deletions.gitignore
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Original file line numberDiff line numberDiff line change
Expand Up@@ -3,6 +3,7 @@
*.dylib
*.so
*.whl
*.xlsx
coverage.html/*
_cache/*
.coverage
Expand Down
15 changes: 15 additions & 0 deletions_unittests/ut_validation/test_f8.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -1246,6 +1246,21 @@ def test_nan(self):
f8 = float32_to_fe4m3(x)
self.assertEqual(e, f8)

def test_negative_zero_uz(self):
self.assertEqual(numpy.float32(-0.0), numpy.float32(0.0))
self.assertEqual(float32_to_fe4m3(-0.00000001, fn=True, uz=False), 128)
self.assertEqual(float32_to_fe4m3(0.00000001, fn=True, uz=True), 0)
self.assertEqual(float32_to_fe4m3(-0.00000001, fn=True, uz=True), 0)
self.assertEqual(float32_to_fe5m2(-0.00000001, fn=False, uz=False), 128)
self.assertEqual(float32_to_fe5m2(0.00000001, fn=True, uz=True), 0)
self.assertEqual(float32_to_fe5m2(-0.00000001, fn=True, uz=True), 0)
self.assertEqual(float32_to_fe4m3(-0.0001, fn=True, uz=False), 128)
self.assertEqual(float32_to_fe4m3(-0.0001, fn=True, uz=True), 0)
self.assertEqual(search_float32_into_fe4m3(-0.0001, fn=True, uz=False), 128)
self.assertEqual(search_float32_into_fe4m3(-0.0001, fn=True, uz=True), 0)
self.assertEqual(search_float32_into_fe5m2(-0.000001, fn=False, uz=False), 128)
self.assertEqual(search_float32_into_fe5m2(-0.000001, fn=True, uz=True), 0)


if __name__ == "__main__":
unittest.main(verbosity=2)
158 changes: 82 additions & 76 deletionsonnx_array_api/validation/f8.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -445,6 +445,11 @@ def search_float32_into_fe4m3(
return (max_value[1] | ret) if saturate else 0x7F | ret
f = numpy.float32(value)
i = CastFloat8.find_closest_value(f, set_values)
if uz:
ic = i & 0x7F
if ic == 0:
return 0
return ic | ret
return (i & 0x7F) | ret


Expand DownExpand Up@@ -488,6 +493,11 @@ def search_float32_into_fe5m2(

f = numpy.float32(value)
i = CastFloat8.find_closest_value(f, set_values)
if uz:
ic = i & 0x7F
if ic == 0:
return 0
return ic | ret
return (i & 0x7F) | ret


Expand DownExpand Up@@ -518,47 +528,45 @@ def float32_to_fe4m3(x, fn: bool = True, uz: bool = False, saturate: bool = True
e = (b & 0x7F800000) >> 23 # exponent
m = b & 0x007FFFFF # mantissa

if e != 0:
if e < 116:
pass
elif e < 120:
# denormalized number
ex = e - 119
if ex >= -2:
ret |= 1 << (2 + ex)
ret |= m >> (21 - ex)
elif m > 0:
ret |= 1
mask = 1 << (20 - ex)
if m & mask and (
ret & 1
or m & (mask - 1) > 0
or (m & mask and m & (mask << 1) and m & (mask - 1) == 0)
):
if e < 116:
ret = 0
elif e < 120:
# denormalized number
ex = e - 119
if ex >= -2:
ret |= 1 << (2 + ex)
ret |= m >> (21 - ex)
elif m > 0:
ret |= 1
else:
ret = 0
mask = 1 << (20 - ex)
if m & mask and (
ret & 1
or m & (mask - 1) > 0
or (m & mask and m & (mask << 1) and m & (mask - 1) == 0)
):
# rounding
ret += 1
elif e < 135:
# normalized number
ex = e - 119 # 127 - 8
if ex == 0:
ret |= 0x4
ret |= m >> 21
else:
ret |= ex << 3
ret |= m >> 20
if m & 0x80000 and ((m & 0x100000) or (m & 0x7FFFF)):
if (ret & 0x7F) < 0x7F:
# rounding
ret += 1
elif e < 135:
# normalized number
ex = e - 119 # 127 - 8
if ex == 0:
ret |= 0x4
ret |= m >> 21
else:
ret |= ex << 3
ret |= m >> 20
if m & 0x80000 and ((m & 0x100000) or (m & 0x7FFFF)):
if (ret & 0x7F) < 0x7F:
# rounding
ret += 1
elif not saturate:
return 0x80
elif saturate:
ret |= 0x7F # 01111110
else:
ret = 0x80
elif m == 0:
# -0
ret = 0
elif not saturate:
return 0x80
elif saturate:
ret |= 0x7F # 01111110
else:
ret = 0x80
return int(ret)
else:
if (b & 0x7FFFFFFF) == 0x7F800000:
Expand DownExpand Up@@ -640,45 +648,43 @@ def float32_to_fe5m2(x, fn: bool = False, uz: bool = False, saturate: bool = Tru
e = (b & 0x7F800000) >> 23 # exponent
m = b & 0x007FFFFF # mantissa

if e != 0:
if e < 109:
pass
elif e < 112:
# denormalized number
ex = e - 111
if ex >= -1:
ret |= 1 << (1 + ex)
ret |= m >> (22 - ex)
elif m > 0:
ret |= 1
mask = 1 << (21 - ex)
if m & mask and (
ret & 1
or m & (mask - 1) > 0
or (m & mask and m & (mask << 1) and m & (mask - 1) == 0)
):
if e < 109:
ret = 0
elif e < 112:
# denormalized number
ex = e - 111
if ex >= -1:
ret |= 1 << (1 + ex)
ret |= m >> (22 - ex)
elif m > 0:
ret |= 1
else:
ret = 0
mask = 1 << (21 - ex)
if m & mask and (
ret & 1
or m & (mask - 1) > 0
or (m & mask and m & (mask << 1) and m & (mask - 1) == 0)
):
# rounding
ret += 1
elif e < 143:
# normalized number
ex = e - 111
ret |= ex << 2
ret |= m >> 21
if m & 0x100000 and ((m & 0xFFFFF) or (m & 0x200000)):
if (ret & 0x7F) < 0x7F:
# rounding
ret += 1
elif e < 143:
# normalized number
ex = e - 111
ret |= ex << 2
ret |= m >> 21
if m & 0x100000 and ((m & 0xFFFFF) or (m & 0x200000)):
if (ret & 0x7F) < 0x7F:
# rounding
ret += 1
elif not saturate:
ret = 0x80
elif e == 255 and m == 0: # inf
ret = 0x80
elif saturate:
ret |= 0x7F # last possible number
else:
ret = 0x80
elif m == 0:
# -0
ret = 0
elif not saturate:
ret = 0x80
elif e == 255 and m == 0: # inf
ret = 0x80
elif saturate:
ret |= 0x7F # last possible number
else:
ret = 0x80
return int(ret)
elif not fn and not uz:
if (b & 0x7FFFFFFF) == 0x7F800000:
Expand Down
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