unsigned int and i << 1

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LX_User
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Joined: Sat. Mar 5, 2011
Posts: 124 View posts
Location: CZ, Zlin
#1
Posted by LX_User: Tue. Apr 5, 2011 - 02:16 PM
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Small bug. I think.

// Small fragment code for M168.

unsigned int i = 1;
unsigned char c;

for (c=0; c < 32; c++)
{
i = i << 1;
if (i == 0x8000) i = 1;
}

Output - Simulator in AS-4
i = 1,2,4,8,...,8192, 16384, 32768, 1,2,...

Output - Simulator in AS-5
i = 1,2,4,8,...,8192, 16384, -32768, 1,2,...

i - is declared like unsigned int, but in simulator has value -32768.

Tags:

Tools, Atmel Studio (AVR-related)
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danv
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Level: Hangaround
Joined: Tue. Mar 1, 2011
Posts: 224 View posts
Location: Atmel, Norway
Posted by danv: Tue. Apr 5, 2011 - 07:21 PM
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Total votes: 0

This bug is fixed in the upcoming beta2 release. Unsigned ints were evaluated as "int"s, as evidenced in the Type column of the watch view.

Regards, Dan

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