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C–6 Alpha Architecture Handbook
C.2 IEEE Floating-Point Instructions
Table C–3 lists the hexadecimal value of the 11-bit function code field for the IEEE float-
ing-point instructions, with and without qualifiers. The opcode for the following instructions is
16
16
, except for SQRTS and SQRTT, which are opcode 14
16
.
Table C–3: IEEE Floating-Point Instruction Function Codes
None /C /M /D /U /UC /UM /UD
ADDS 080 000 040 0C0 180 100 140 1C0
ADDT 0A0 020 060 0E0 1A0 120 160 1E0
CMPTEQ 0A5
CMPTLE 0A7
CMPTLT 0A6
CMPTUN 0A4
CVTQS 0BC 03C 07C 0FC
CVTQT 0BE 03E 07E 0FE
CVTST See below
CVTTQ See below
CVTTS 0AC 02C 06C 0EC 1AC 12C 16C 1EC
DIVS 083 003 043 0C3 183 103 143 1C3
DIVT 0A3 023 063 0E3 1A3 123 163 1E3
MULS 082 002 042 0C2 182 102 142 1C2
MULT 0A2 022 062 0E2 1A2 122 162 1E2
SQRTS 08B 00B 04B 0CB 18B 10B 14B 1CB
SQRTT 0AB 02B 06B 0EB 1AB 12B 16B 1EB
SUBS 081 001 041 0C1 181 101 141 1C1
SUBT 0A1 021 061 0E1 1A1 121 161 1E1
/SU /SUC /SUM /SUD /SUI /SUIC /SUIM /SUID
ADDS 580 500 540 5C0 780 700 740 7C0
ADDT 5A0 520 560 5E0 7A0 720 760 7E0
CMPTEQ 5A5
CMPTLE 5A7
CMPTLT 5A6
CMPTUN 5A4
CVTQS 7BC 73C 77C 7FC
CVTQT 7BE 73E 77E 7FE
CVTTS 5AC 52C 56C 5EC 7AC 72C 76C 7EC
DIVS 583 503 543 5C3 783 703 743 7C3
DIVT 5A3 523 563 5E3 7A3 723 763 7E3
MULS 582 502 542 5C2 782 702 742 7C2
MULT 5A2 522 562 5E2 7A2 722 762 7E2
SQRTS 58B 50B 54B 5CB 78B 70B 74B 7CB
SQRTT 5AB 52B 56B 5EB 7AB 72B 76B 7EB
SUBS 581 501 541 5C1 781 701 741 7C1
SUBT 5A1 521 561 5E1 7A1 721 761 7E1
None /S
CVTST 2AC 6AC