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very strange bug (when runing c basic arrays code)

Obi Wan Kenobi · 2014-06-30T20:34:41

I was testing such very simple code float modelRight_x = 1.1; float modelRight_y = 1.2; float modelRight_z = 1.3; float modelUp_x = 1.1; float modelUp_y = 1.2; float modelUp_z = 1.3; float modelDir_x = 1.1; float modelDir_y = 1.2; float modelDir_z = 1.3; float normal_x[100*1000]; float normal_y[100*1000]; float normal_z[100*1000]; float n_x[100*1000]; float n_y[100*1000]; float n_z[100*1000]; void matrix_mul_float() { for(int i=0; i<100*1000; i++) { normal_x[i] = n_x[i]*modelRight_x + n_y[i]*modelRight_y + n_z[i]*modelRight_z; normal_y[i] = n_x[i]*modelUp_x + n_y[i]*modelUp_y + n_z[i]*modelUp_z; //third line -> normal_z[i] = n_x[i]*modelDir_x + n_y[i]*modelDir_y + n_z[i]*modelDir_z; } return; } (dam those forum bug eated text again) I got runtime crash on the third line , when comment this line its ok, when xchange it with normal_x = ... line it crashes on those x third line then, it also works when changing normal_z[i/2] = n_x*modelDir_x + n_y*modelDir_y + n_z*modelDir_z; very strange imo normal_z[i/1*1] = n_x*modelDir_x + n_y*modelDir_y + n_z*modelDir_z; crashes normal_z[i/2*2] = n_x*modelDir_x + n_y*modelDir_y + n_z*modelDir_z; not crashes compile options c:\mingw\bin\g++ -O3 -Ofast -w -c tests.c -funsafe-math-optimizations -mrecip -ffast-math -fno-rtti -fno-exceptions -march=pentium4 -mtune=generic -mfpmath=both gcc 4.7.1 is this compiler bug?

General and Gameplay Programming Programming

Started by fir June 30, 2014 11:55 AM

39 comments, last by Washu 9 years, 9 months ago

Washu

7,836

June 30, 2014 08:34 PM

Just as an addendum we have a decent article on learning to use the handy debugger built into visual studio... after all, you never know when its going to be a fork

In time the project grows, the ignorance of its devs it shows, with many a convoluted function, it plunges into deep compunction, the price of failure is high, Washu's mirth is nigh.

very strange bug (when runing c basic arrays code)

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very strange bug (when runing c basic arrays code)

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