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B–10 Alpha Architecture Handbook
CMPTLT CMPTLE INPUT Exceptions:
Denormal operand Trap Trap Supply ≤ or <
[Denormal Op
2
]
QNaN operand Trap Trap Supply False [Invalid Op]
SNaN operand Trap Trap Supply False [Invalid Op]
CVTfi INPUT Exceptions:
Denormal operand Trap Trap Supply Cvt
[Denormal Op
2
]
+/-Inf operand Trap Trap Supply 0 [Invalid Op]
QNaN operand Trap Trap Supply 0 –
SNaN operand Trap Trap Supply 0 [Invalid Op]
CVTfi OUTPUT Exceptions:
Inexact and disabled – – – –
Inexact and enabled Supply Cvt
and trap
Trap – [Inexact]
Integer overflow Supply Trunc.
result and trap
if enabled
Trap –
[Invalid Op
5
]
CVTif OUTPUT Exceptions:
Inexact and disabled – – – –
Inexact and enabled Supply Cvt
and trap
Trap – [Inexact]
CVTff INPUT Exceptions:
Denormal operand Trap Trap Supply Cvt
[Denormal Op
2
]
+/-Inf operand Trap Trap Supply Cvt –
QNaN operand Trap Trap Supply QNaN –
SNaN operand Trap Trap Supply QNaN [Invalid Op]
CVTff OUTPUT Exceptions:
Exponent overflow Trap Trap Supply
+/–Inf
+/–MAX
[Overflow
3
]
Scale by bias
adjust
Exponent underflow and disabled Supply +0 – – –
Exponent underflow and enabled Supply +0
and trap
Trap Supply
+/– MIN
denorm
+/–0
[Underflow
3
]
Scale by bias
adjust
Inexact and disabled – – – –
Inexact and enabled Supply Cvt
and trap
Trap – [Inexact]
Table B–2: IEEE Floating-Point Trap Handling (Continued)
Alpha Instructions
Hardware
1
PAL-
Code
OS
Completion
Handler
User
Signal
Handler