ÐïëëÜ ðñÜãìáôá ìðïñïý?* ?*á ðÜ?*å óôñáâÜ óôï BC, åîïý êáé ç á?*Üãêç patching, åéäéêÜ á?* ìéëÜìå ãéá low-level ðñïãñáììáôéóìü.
Ìðïñåß ?*áé ìå?* Ý?*á ðáé÷?*ßäé ?*á ôñÝ÷åé unpatched, áëëÜ ?*á ðáñïõóéÜæåé visual glitches. Èá Þôá?* áðïäåêôü êÜôé ôÝôïéï; Äå?* ?*ïìßæù.
Åäþ ?*á óçìåéþóù üôé ç ISA (Instruction Set Architecture, áõôü ðïõ ëÝìå áñ÷éôåêôï?*éêÞ êáé óåô å?*ôïëþ?*) ôçò RDNA2 GPU åß?*áé ç GCN. Áõôü ôï ëÝù ãéáôß êõêëïöïñåß óõ÷?*Ü ùò ðáñá?*üçóç óôï äéáäßêôõï (äå?* ìéëÜù ãéá åäþ ìÝóá ðñïò áðïöõãÞ?* ðáñåîçãÞóåù?*).
Ìá èá ðåé êÜðïéïò äå?* åß?*áé GCN! Êáé üìùò, GCN åß?*áé (äå?* Ý÷åé áëëÜîåé ç áñ÷éôåêôï?*éêÞ), åéäÜëëùò äå?* èá åß÷áìå êá?* BC. Å?*ôåëþò äéáöïñåôéêÞ áñ÷éôåêôï?*éêÞ = bye-bye BC (ìéëÜù ãéá native execution, ü÷é emulation).
Ç RDNA/Navi åß?*áé -ãéá ?*á ôï ðù áðëïúêÜ- GCN ìå tiled rasterizer (ðïõ á?*åâÜæåé ôï efficiency êáé ñß÷?*åé ôç?* êáôá?*Üëùóç). ¸÷ù îá?*áãñÜøåé óå Üëëï post ôé åß?*áé ôï tiling êáé ðùò äïõëåýåé (óðÜóéìï ôçò åéêü?*áò/framebuffer óå êïõôÜêéá ãéá ðéï efficient åðåîåñãáóßá ãñáöéêþ?*).
Ãéá ?*á ìç?* õðÜñ÷åé êáìßá ðáñÜ?*ïçóç ëïéðü?*:
GCN = ç GPU ISA
Polaris/RDNA = uarch (ìéêñïáñ÷éôåêôï?*éêÞ)
Ôï ?*á ðåé êÜðïéïò äå?* åß?*áé GCN ISA ç RDNA2 uarch, åß?*áé óá?* ?*á ðåé êÜðïéïò ôï åîÞò ðáñÜëïãï: üôé ç Zen 2 CPU äå?* åß?*áé x86-64!
x86-64 = ç CPU ISA
Jaguar/Zen 2 = ç ìéêñïáñ÷éôåêôï?*éêÞ
Ôé åß?*áé ç ìéêñïáñ÷éôåêôï?*éêÞ; Åß?*áé ç åêÜóôïôå õëïðïßçóç ôçò áñ÷éôåêôï?*éêÞò.
Ç áñ÷éôåêôï?*éêÞ åß?*áé ìéá (áëëÜæåé ðïëý óðÜ?*éá), áëëÜ ïé ìéêñïáñ÷éôåêôï?*éêÝò ðïëëÝò êáé äéÜöïñåò (êÜðïéåò êáëÝò, êÜðïéåò ìÝôñéåò, êÜðïéåò êáêÝò).
¼óï ðéï ?*åüôåñç åß?*áé ìéá ìéêñïáñ÷éôåêôï?*éêÞ, ôüóï ðéï efficient åß?*áé (óõ?*Þèùò äçëáäÞ, óðá?*ßùò èá õðÜñîåé efficiency regression).
Ï ëüãïò ðïõ äå?* áëëÜæåé ç áñ÷éôåêôï?*éêÞ/ISA åß?*áé ëüãù BC requirements. ÔÝëåéï BC üìùò äå?* õðÜñ÷åé ðïõèå?*Ü (ïýôå êá?* óå PC, áó÷Ýôùò ôïõ ôé áêïýôå).







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