VFP Exception Handling
ARM DDI 0301H Copyright © 2004-2009 ARM Limited. All rights reserved. 22-19
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22.11 Input exceptions
The VFP11 hardware processes most input operands without support code assistance. However,
the hardware is incapable of processing some operands and bounces to support code to process
the instruction. An arithmetic operation bounces with an Input exception when it has either of
the following:
• a NaN operand or operands, and default NaN mode is not enabled
• a subnormal operand or operands, and flush-to-zero mode is not enabled.
Note
In default NaN mode, an SNaN input to an arithmetic operation causes an Invalid Operation
exception. When the IOE bit, FPSCR[8], is set, the instruction bounces to the Invalid Operation
user trap handler. When the IOE bit is clear, and the VFP11 coprocessor is not in default NaN
mode, the instruction bounces to the support code.
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