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19.5
Maintaining consistency in register precision
ARM DDI 0301H
ID012310
The VFP11 register file stores single-precision, double-precision, and integer data in the same
registers. For example, D6 occupies the same registers as S12 and S13. The usable format of the
register or registers depends on the last load or arithmetic instruction that wrote to the register
or registers.
The VFP11 hardware does not check the register format to see if it is consistent with the
precision of the current operation. Inconsistent use of the registers is possible but Unpredictable.
The hardware interprets the data in the format required by the instruction regardless of the latest
store or write operation to the register. It is the task of the compiler or programmer to maintain
consistency in register usage.
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The VFP Register File
19-8
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