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Sat Sep 27 15:54:56 CEST 2014

## Q or GE

Point of Q: perform a series of operations, then check if overflow
occured at the end.
CPSR has the following 32 bits.[43]
M (bits 0–4) is the processor mode bits.
T (bit 5) is the Thumb state bit.
F (bit 6) is the FIQ disable bit.
I (bit 7) is the IRQ disable bit.
A (bit 8) is the imprecise data abort disable bit.
E (bit 9) is the data endianness bit.
IT (bits 10–15 and 25–26) is the if-then state bits.
GE (bits 16–19) is the greater-than-or-equal-to bits.
DNM (bits 20–23) is the do not modify bits.
J (bit 24) is the Java state bit.
Q (bit 27) is the sticky overflow bit.
V (bit 28) is the overflow bit.
C (bit 29) is the carry/borrow/extend bit.
Z (bit 30) is the zero bit.
N (bit 31) is the negative/less than bit.
[1] http://en.wikipedia.org/wiki/ARM_architecture
[2] http://stackoverflow.com/questions/19557338/importance-of-qsaturation-flag-in-arm

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