[Octave-bug-tracker] [bug #54572] int64 does not saturate correctly in negative direction

[Rik]

Follow-up Comment #22, bug #54572 (project octave):

The second sample code from comment #16 works for me regardless of
optimization level.  I'm attaching a modified version of the original called
tst-overflow.rik.cc.  It fails for me at the addition operator.


~/code/cppsrc: g++ -O2 --std=c++11 int-overflow.rik.cc 
~/code/cppsrc: a.out 
-9223372036854775808 + -2
branch 1: -9223372036854775808 + -2
TMP START
9223372036854775807 + 1
9223372036854775807
TMP END
9223372036854775807
~/code/cppsrc: g++ -O1 --std=c++11 int-overflow.rik.cc -o a.out2
~/code/cppsrc: a.out2 
-9223372036854775808 + -2
branch 1: -9223372036854775808 + -2
TMP START
9223372036854775807 + 1
-9223372036854775808
TMP END
-9223372036854775808




(file #44892)
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Additional Item Attachment:

File name: int-overflow.rik.cc            Size:6 KB


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