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Add zeroext/signext attributes to C ABI functions where appropriate #31725

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Add zeroext/signext attributes to C ABI functions where appropriate #31725

wants to merge 3 commits into from

Commits on Feb 17, 2016

  1. Handle integer-extending for C ABI 

    We need to supply sext/zext attributes to LLVM to ensure that arguments
are extended to the appropriate width in the correct way.

This commit adds the necessary infrastructure for handling integer
widening and makes the x86-64 code produce the correct information.
    @Aatch
    Aatch committed Feb 17, 2016
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  2. Classify integer arguments as 'Extend' where appropriate 

    Most platforms extend integers less than 32 bits, though not all.
    @Aatch
    Aatch committed Feb 17, 2016
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  3. Add test for C ABI integer widening

    @Aatch
    Aatch committed Feb 17, 2016
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