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- Newsgroups: comp.arch
- Path: sparky!uunet!boole!John
- From: John@boole.uucp (John Ahlstrom)
- Subject: Re: Not using integers
- Message-ID: <1992Sep14.161640.19263@boole.uucp>
- Organization: Boole & Babbage, Inc.
- References: <1992Sep8.182423.26063@athena.mit.edu> <1265@taniwha.UUCP>
- Date: Mon, 14 Sep 1992 16:16:40 GMT
- Lines: 29
-
- In <1265@taniwha.UUCP> paul@taniwha.UUCP (Paul Campbell) writes:
-
- >In article <1992Sep8.182423.26063@athena.mit.edu> solman@athena.mit.edu (Jason W Solinsky) writes:
- >>Does anybody here know of any microprocessors which did not use any integer
- >>units or registers, but instead modified the floating point execution units
- >>to inhibit the normalization pipe stage whenever an "integer" flag within
- >>the instruction was set.
-
- >The good old Burroughs 6700 (and family now called the A-series) had/has a
- >FP format for which a value with a 0 exponent looks like a 'normal' integer
- >(they use a signed integer rather than a 2's complement one) - the hardware
- >goes out of its way to keep a 0 exponent for values if it possibly can ...
- >this means that there are no FP/INT instructions, there's only one ADD, SUB,
- >MULT etc instructions
-
- > Paul
- >--
- >Paul Campbell UUCP: ..!mtxinu!taniwha!paul AppleLink: CAMPBELL.P
-
- > "Most American's day to day experience of 'Family Values' is found in
- > brightly colored fliers from such organisations as Target and K-Mart."
-
- And Integer Store and Conditional Integer Store instructions when you had to
- finally store a value in an integer, or possibly integer variable.
-
- John Ahlstrom
- Boole & Babbage
- "I cannot confirm or deny that these opinions are or are not
- held by anyone else"
-