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Open
Created Oct 30, 2019 by Timothy E Baldwin@tbaldwinDeveloper
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Add myBX, myBLX and CallI, use BX/BLX if supported.

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BLX pushes to the call-return stack so return branches can be predicted, which can potentially improve performance.

BX is allegedly faster on some CPUs.

Both are also required for inter-working with Thumb code before ARMv7.

When building for CPUs that do not support BX/BLX these macros use MOV instead.

Edited Aug 12, 2020 by Timothy E Baldwin
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Source branch: HdrSrc-BX