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Editorial Team
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Asked: 2026-05-26T04:38:04+00:00

I am optimizing some hotspots in my application and compilation is done using gcc-arm

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I am optimizing some hotspots in my application and compilation is done using gcc-arm.

Now, is there any chance that the following statements result in different assembler code:

static const pixel_t roundedwhite = 4294572537U;
return (packed >= roundedwhite) ? purewhite : packed;

// OR
const pixel_t roundedwhite = 4294572537U;
return (packed >= roundedwhite) ? purewhite : packed;

// OR
return (packed >= 4294572537U) ? purewhite : packed;

Is there any chance that my ARM compiler might produce the unwanted code for the first case or should this get optimized anyway?

I assume that it’s pretty the same, but, unfortunately, I am not that sure in what gcc-arm does compared to ordinary gcc and I can’t access the disassembly listing.

Thank you very much.

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1 Answer

  1. Editorial Team

    Call gcc with the -S flag and take a look at the assembly:

    -S

    Stop after the stage of compilation proper; do not assemble. The output is in the form of an assembler code file for each non-assembler input file specified.

    I would it out try myself to include in the answer, but I don’t have an ARM compiler handy.

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