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XER
Fixed Point Exception Register
Register Summary 10-53
XER
SPR 0x001
See “Fixed Point Exception Register (XER)” on page 2-7.
Figure 10-36. Fixed Point Exception Register (XER)
0 SO Summary Overflow
0 No overflow has occurred.
1 Overflow has occurred.
Can be
set
by mtspr or by using “o” form
instructions; can be
reset
by mtspr or by
mcrxr.
1 OV Overflow
0 No overflow has occurred.
0 Overflow has occurred.
Can be
set
by mtspr or by using “o” form
instructions; can be
reset
by mtspr, by
mcrxr, or “o” form instructions.
2 CA Carry
0 Carry has not occurred.
1 Carry has occurred.
Can be
set
by mtspr or arithmetic
instructions that update the CA field; can
be
reset
by mtspr, by mcrxr, or by
arithmetic instructions that update the CA
field.
3:24
Reserved
25:31 TBC Transfer Byte Count Used by lswx and stswx; written by mtspr.
0123 24 25 31
SO
OV
CA
TBC