Keil forum "VOLATILE" IS VERY C0NFUSING

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"VOLATILE" IS VERY C0NFUSING

amol bhrd over 16 years ago

I AM NOT UNDERSTANDING THE SITUATION WHEN SHOULD I USE "VOLATILE" WITH VARIABLES ???

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0 ImPer Westermark over 16 years ago in reply to HansBernhard Broeker

It seems to depend a lot on gcc version. Most probably, only versions before 4.x keep empty loops.

Test with empty loop and -O3:

gcc 2.95.4 leaves loop.
gcc 3.0.4 leaves loop.
gcc 3.3.1 leaves loop.
gcc 3.3.5 leaves loop.
gcc 3.3.6 leaves loop.
gcc 4.1.2 strips loop.
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0 ImPer Westermark over 16 years ago in reply to HansBernhard Broeker

It seems to depend a lot on gcc version. Most probably, only versions before 4.x keep empty loops.

Test with empty loop and -O3:

gcc 2.95.4 leaves loop.
gcc 3.0.4 leaves loop.
gcc 3.3.1 leaves loop.
gcc 3.3.5 leaves loop.
gcc 3.3.6 leaves loop.
gcc 4.1.2 strips loop.
Cancel
Vote up 0 Vote down

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