6.18 Expansion of inline assembler load and store instructions
STRD instructions might be replaced by equivalent ARM instructions.
In this case the compiler outputs a warning message informing you that it might expand
instructions. The warning can be suppressed with
Inline assembly code must be written in such a way that it does not depend on the number of
expected instructions or on the expected execution time for each specified instruction.
Instructions that normally place constraints on pairs of operand registers, such as
STRD, are replaced by a sequence of
instructions with equivalent functionality and without the constraints. However, these might
be recombined into
STM instructions are expanded into a sequence
STR instructions with equivalent effect.
However, the compiler might subsequently recombine the separate instructions into an
STM during optimization.