sautiller wrote:
另外, 1998 年推出的 Dreamcast 電視遊樂器, 它的 CPU 就是 128 位元的 FPU (浮點運算單元),
以某種程度來說, 它就是 128 位元的 CPU.
俗稱的 CPU 幾位員不是這樣算的吧 =.=
chiouss wrote:
俗稱的 CPU 幾位員不是這樣算的吧 =.=
一般的說法是以 CPU 一次 clock cycle 可處理的整數的位元數來歸類.
http://en.wikipedia.org/wiki/Central_processing_unit#Integer_range
Related to number representation is the size and precision of numbers that a CPU can represent. In the case of a binary CPU, a bit refers to one significant place in the numbers a CPU deals with. The number of bits (or numeral places) a CPU uses to represent numbers is often called "word size", "bit width", "data path width", or "integer precision" when dealing with strictly integer numbers (as opposed to floating point). This number differs between architectures, and often within different parts of the very same CPU. For example, an 8-bit CPU deals with a range of numbers that can be represented by eight binary digits (each digit having two possible values), that is, 2^8 or 256 discrete numbers. In effect, integer size sets a hardware limit on the range of integers the software run by the CPU can utilize.
sautiller wrote:
另外, 1998 年推出的 Dreamcast 電視遊樂器, 它的 CPU 就是 128 位元的 FPU (浮點運算單元),
以某種程度來說, 它就是 128 位元的 CPU.
.......
一般的說法是以 CPU 一次 clock cycle 可處理的整數的位元數來歸類.
...(恕刪)
1998年的DreamCast用的是Hitachi的SH-4處理器，那是一顆32位元的處理器，具有SIMD/Vector Floating Point Unit，但不代表SH-4是一顆128位元處理器，如果這樣定義，那實作出SSE指令集跟128位元SSE暫存器的Intel Pentium III以及AMD Athlon XP也都變成128位元處理器了....
SH-4的下一代SH-5，是SuperH架構的第一顆高階64位元架構處理器，如果SH-4已經是128位元處理器了，那SH-5就倒退嚕嘍！
笨冰 wrote:
有這種事?現在有12...(恕刪)
http://en.wikipedia.org/wiki/128-bit
There are currently no mainstream general-purpose processors built to operate on 128-bit integers or addresses, though a number of processors do operate on 128-bit data. System/370, made by IBM, could be considered the first rudimentary 128-bit computer as it used 128-bit floating point registers.
應該說有~ibm的產品
IBM其實已經轉成技術研發公司.. 很多新技術都逃不過他們專利權的魔掌...
ycweng wrote:
1998年的DreamCast用的是Hitachi的SH-4處理器，那是一顆32位元的處理器，具有SIMD/Vector Floating Point Unit，但不代表SH-4是一顆128位元處理器
當時的時代背景, 大概是 CPU 裡面有任何一個 processing unit 是整顆 CPU 裡最大的 N-bit, 就稱呼它為 N-bit 的吧... 後來 Intel IA64 出現之後, 就不再這樣歸納了.
http://en.wikipedia.org/wiki/128-bit
嗯, 我也看到 Wikipedia 的 Dreamcast 條目, 講到 Dreamcast 的 CPU 是 32-bit 的 SH-4.
Quoted: The system's processor is a 200 MHz SH-4 with an on-die 128-bit vector graphics engine, 360 MIPS and 1.4 GFLOPS (single precision), using the vector graphics engine.
不過, 當時 Dreamcast 在報章雜誌的文宣, 的確有強調它是 128-bit 的處理器. 這邊有提到:
http://en.wikipedia.org/wiki/History_of_video_game_consoles_%28sixth_generation%29#Number_of_bits_and_system_power
Quoted: The importance of the number of bits in the modern console gaming market has thus decreased due to the use of components that process data in varying word sizes. Previously, console manufacturers advertised the “n-bit talk” to over-emphasize the hardware capabilities of their system. The Dreamcast and the PlayStation 2 were the last systems to use the term “128-bit” in their marketing to describe their capability.
Google 搜尋 "Dreamcast 128-bit" 可得到很多結果:
http://www.google.com.tw/search?hl=zh-TW&safe=off#=100&newwindow=1&q=Dreamcast+128-bit&btnG=%E6%90%9C%E5%B0%8B&meta=&aq=f&oq=
sautiller wrote:
不過, 當時 Dreamcast 在報章雜誌的文宣, 的確有強調它是 128-bit 的處理器. 這邊有提到:
http://en.wikipedia.org/wiki/History_of_video_game_consoles_%28sixth_generation%29#Number_of_bits_and_system_power
Quoted: The importance of the number of bits in the modern console gaming market has thus decreased due to the use of components that process data in varying word sizes. Previously, console manufacturers advertised the “n-bit talk” to over-emphasize the hardware capabilities of their system. The Dreamcast and the PlayStation 2 were the last systems to use the term “128-bit” in their marketing to describe their capability.
...(恕刪)
這是技術行銷的手法，但重點還是如果這些為了行銷而行銷的"宣稱"成立，那Pentium III跟Athlon XP，也就都自動變成128位元處理器了.......
PS2 Emotion Engine內建的通用處理核心是MIPS R5900， 而R5900實作的是64位元的MIPS III RISC架構指令集加上部分MIPS IV的指令。
Intel的SandyBridge以及AMD的Bulldozer微架構，未來可能會加入使用256-bit暫存器的AVX指令集，但並不會讓基於這兩種微架構的處理器搖身變成256位元處理器。
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