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Modifiers

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9/7/2007

ARM and THUMB support Microsoft-specific modifiers for interworking. The iwcall, iw16, and iw32 declspecs allow you to select which function calls are interworking.

Compared to a linker-generated thunking routine, the iwcall or iw16 declspecs always result in faster code for interworking calls. The declspecs add only a single MOV instruction to the execution path, while a linker-generated thunking routine adds two instructions: a load from memory, and a branch.

See Also

Concepts

THUMB-enabled ARM Implementation
Linker-Generated Thunking Routines