Re^4: History repeats: 128 bit Math:Bigint numbers in a 64 bit DBI world

You guys have given the "correct" answer: I'm also convinced that Math::Int128 is the right way to go.

Math::Int128 *should* work on my install, but it does not.

perl -v

This is perl 5, version 16, subversion 3 (v5.16.3) built for MSWin32-x
+64-multi-thread

cpan Math::Int128


<snip>

t/00-report-prereqs.t ..... ok
t/author-eol.t ............ skipped: these tests are for testing by th
+e author
t/author-no-tabs.t ........ skipped: these tests are for testing by th
+e author
t/author-pod-spell.t ...... skipped: these tests are for testing by th
+e author
t/bugs.t .................. ok
t/Math-Int128.t ........... 1/?
#   Failed test 'max int128 >> 95'
#   at t/Math-Int128.t line 174.
#          got: '4294967295'
#     expected: '1'
# $max >> $j = 4294967295, $max / 2 ** $j = 1, $max = 1701411834604692
+3173168730
3715884105727, $j = 95, 2 ** $j = 39614081257132169000000000000.000000
+, int128(2
 ** $j) = 39614081257132168796771975168

#   Failed test 'max int128 >>= 95'
#   at t/Math-Int128.t line 183.
#          got: '4294967295'
#     expected: '1'
t/Math-Int128.t ........... Dubious, test returned 148 (wstat 37888, 0
+x9400)
Failed 2/785 subtests
t/Math-UInt128.t .......... 1/?
#   Failed test 'max uint128 >> 95'
#   at t/Math-UInt128.t line 172.
#          got: '8589934591'
#     expected: '1'

#   Failed test 'max uint128 >>= 95'
#   at t/Math-UInt128.t line 176.
#          got: '8589934591'
#     expected: '1'
<snip>
[download]

Obviously there are math overflows being triggered in the tests. I'll try another (later) version but there's some very old code on this box. Plus I need mod_perl2 and Apache2 which increases the dependencies. Not asking for sympathy. It's just how it is.

BTW pack ('Q', blah) and unpack ('Q',blah) which require 64 bit PERL, DOES work.

Comment on Re^4: History repeats: 128 bit Math:Bigint numbers in a 64 bit DBI world Download Code

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Re^5: History repeats: 128 bit Math:Bigint numbers in a 64 bit DBI world by BrowserUk (Patriarch) on Jul 04, 2016 at 14:06 UTC
If you do 'make clean' and then 'makefile'; do you see this?: `... Checking for unsigned int __attribute__ ((__mode__ (DI)))... no Checking for uint64_t... (cached) no Checking for unsigned int __attribute__ ((__mode__ (DI)))... (cached) +no It looks like your compiler doesn't support a 128-bit integer type ( +one of "int __attribute__ ((__mode__ (TI)))" or "__int128"). One of these t +ypes is necessary to compile the Math::Int128 module.` [download] With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday' Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". I knew I was on the right track :) In the absence of evidence, opinion is indistinguishable from prejudice. Not understood.	[reply] [d/l]
Re^5: History repeats: 128 bit Math:Bigint numbers in a 64 bit DBI world by syphilis (Archbishop) on Jul 05, 2016 at 00:33 UTC
There's a known bug with Strawberry 5.16.x builds - see line 179 of Math-Int128.t. I suspect you might have uncovered another bug with Strawberry 5.16.3. For my own MinGW builds of MSWin32-x64-multi-thread I find no problem with Math-Int128-0.22 going back to 5.12.0. Cheers, Rob	[reply]
Re^6: History repeats: 128 bit Math:Bigint numbers in a 64 bit DBI world by salva (Canon) on Jul 05, 2016 at 08:20 UTC
Actually, it is the same bug. What is odd is that it doesn't trigger the check that follows in the test script.	[reply]


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