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4–106 Alpha Architecture Handbook
4.10.2 Convert Integer to Integer
Format:
Operation:
CASE
CVTQL: Fc ← Fbv<31:30> || 0<2:0> || Fbv<29:0> ||0<28:0>
CVTLQ: Fc ← SEXT(Fbv<63:62> || Fbv<58:29>)
ENDCASE
Exceptions:
Instruction mnemonics:
Qualifiers:
Description:
The two’s-complement operand in register Fb is converted to a two’s-complement result and
written to register Fc. Register Fa must be F31.
The conversion from quadword to longword is a repositioning of the low 32 bits of the oper-
and, with zero fill and optional integer overflow checking. Integer overflow occurs if Fb is
outside the range –2**31..2**31–1. If integer overflow occurs, the truncated result is stored in
Fc, and an arithmetic trap is taken if enabled.
The conversion from longword to quadword is a repositioning of 32 bits of the operand, with
sign extension.
CVTxy Fb.rq,Fc.wx
!Floating-point Operate format
Integer Overflow, CVTQL only
CVTLQ Convert Longword to Quadword
CVTQL Convert Quadword to Longword
Trapping: Exception Completion (/S) (CVTQL only)
Integer Overflow Enable (/V) (CVTQL only)