[squeak-dev] The Trunk: Kernel-cmm.758.mcz
Frank Shearar
frank.shearar at gmail.com
Fri May 3 20:03:54 UTC 2013
Then we should fix our systems! Because having thousands of one-line
changes - if they are indeed independent - should be exactly what we
should be doing. Each commit becomes trivial to QA.
frank
On 3 May 2013 18:32, Chris Muller <asqueaker at gmail.com> wrote:
> Our systems cannot handle thousands of one-line changes. The ancestry
> is kept in memory, bloating our images, and the FileBasedRepository
> types utilized by our trunk process only operate by enumerating every
> single version into a list, grinding our systems ever slower. Totally
> unsustainable.
>
>
> On Fri, May 3, 2013 at 11:53 AM, Bert Freudenberg <bert at freudenbergs.de> wrote:
>>
>> On 2013-05-03, at 16:44, commits at source.squeak.org wrote:
>>
>>> Chris Muller uploaded a new version of Kernel to project The Trunk:
>>> http://source.squeak.org/trunk/Kernel-cmm.758.mcz
>>>
>>> ==================== Summary ====================
>>>
>>> Name: Kernel-cmm.758
>>> Author: cmm
>>> Time: 3 May 2013, 11:43:45.83 am
>>> UUID: b64656cf-20bf-4bad-9fca-2750e1c67e67
>>> Ancestors: Kernel-cmm.757
>>>
>>> - Another ticky-tack commit because Monticello-bf.540 did not capture ALL package changes.
>>
>> We already established that my MC mod does not match your old workflow ;)
>>
>> OTOH, I do prefer this to be two separate commits, because they have nothing to do with each other, except that they happen to be in the same package.
>>
>> - Bert -
>>
>>
>>
>>> The comment for the prior package is wrong, it did not include this change because I failed to:
>>>
>>> 1) Copy the change text to the clipboard
>>> 2) click "Cancel"
>>> 3) Find a MC browser.
>>> 4) Click "Save"
>>> 5) Re-paste the change text.
>>>
>>> Please see my immediate ancestor for what this change is about.
>>>
>>> =============== Diff against Kernel-cmm.757 ===============
>>>
>>> Item was changed:
>>> ----- Method: Float class>>fromIEEE32Bit: (in category 'instance creation') -----
>>> fromIEEE32Bit: word
>>> "Convert the given 32 bit word (which is supposed to be a positive 32bit value) from a 32bit IEEE floating point representation into an actual Squeak float object (being 64bit wide). Should only be used for conversion in FloatArrays or likewise objects."
>>>
>>> | sign mantissa exponent newFloat delta |
>>> word negative ifTrue: [^ self error:'Cannot deal with negative numbers'].
>>> + word = 0 ifTrue: [^ Float zero].
>>> - word = 0 ifTrue: [^ 0.0].
>>> sign := word bitAnd: 16r80000000.
>>> word = sign ifTrue: [^self negativeZero].
>>>
>>> exponent := ((word bitShift: -23) bitAnd: 16rFF) - 127.
>>> mantissa := word bitAnd: 16r7FFFFF.
>>>
>>> exponent = 128 ifTrue:["Either NAN or INF"
>>> mantissa = 0 ifFalse:[^ Float nan].
>>> sign = 0
>>> ifTrue:[^ Float infinity]
>>> ifFalse:[^ Float infinity negated]].
>>>
>>> exponent = -127 ifTrue: [
>>> "gradual underflow (denormalized number)
>>> Remove first bit of mantissa and adjust exponent"
>>> delta := mantissa highBit.
>>> mantissa := (mantissa bitShift: 1) bitAnd: (1 bitShift: delta) - 1.
>>> exponent := exponent + delta - 23].
>>>
>>> "Create new float"
>>> newFloat := self new: 2.
>>> newFloat basicAt: 1 put: ((sign bitOr: (1023 + exponent bitShift: 20)) bitOr: (mantissa bitShift: -3)).
>>> newFloat basicAt: 2 put: ((mantissa bitAnd: 7) bitShift: 29).
>>> ^newFloat!
>>>
>>>
>>
>>
>
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