Optimized memcpy and mempcpy#594
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Changes:
memcpyandmempcpystrlenmemsetfor speed (Adds 6 bytes and 6F, but removes 5R + 12W in full execution case)bzero. This copies zeros from0xE40000which has less read states, thereby making it significantly faster thanmemset.memcpyandmempcpywere optimized by turningNC \ sbc hl, hl \ sbc hl, bc \ ret zintoC \ sbc hl, hl \ add hl, bc \ ret nc, saving 1 byte and 1F in all cases. The carry flag is set by doingld iy, -1 \ add iy, spinstead of the usualld iy, 0 \ add iy, sp