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keiravillekodekeiravillekode
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Add game-of-life
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‎config.json

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"prerequisites": [],
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"difficulty": 8
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},
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{
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"slug": "game-of-life",
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"name": "Conway's Game of Life",
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"uuid": "5e290392-ad3b-42a7-8612-9f22a69dfeaf",
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"practices": [],
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"prerequisites": [],
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"difficulty": 8
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},
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{
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"slug": "meetup",
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"name": "Meetup",

‎exercises/practice/game-of-life/.docs/instructions.append.md

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# Instructions append
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Each row of the grid is represented as a 64 bit integer.
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For example,
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```
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0 1 0
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1 0 0
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1 1 0
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```
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is represented as
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```
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2
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4
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6
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```
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The grid has at most 64 columns.

‎exercises/practice/game-of-life/.docs/instructions.md

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# Instructions
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After each generation, the cells interact with their eight neighbors, which are cells adjacent horizontally, vertically, or diagonally.
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The following rules are applied to each cell:
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- Any live cell with two or three live neighbors lives on.
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- Any dead cell with exactly three live neighbors becomes a live cell.
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- All other cells die or stay dead.
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Given a matrix of 1s and 0s (corresponding to live and dead cells), apply the rules to each cell, and return the next generation.

‎exercises/practice/game-of-life/.docs/introduction.md

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# Introduction
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[Conway's Game of Life][game-of-life] is a fascinating cellular automaton created by the British mathematician John Horton Conway in 1970.
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The game consists of a two-dimensional grid of cells that can either be "alive" or "dead."
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After each generation, the cells interact with their eight neighbors via a set of rules, which define the new generation.
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[game-of-life]: https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life

‎exercises/practice/game-of-life/.meta/config.json

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{
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"authors": [
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"keiravillekode"
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],
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"files": {
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"solution": [
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"game_of_life.s"
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],
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"test": [
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"game_of_life_test.c"
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],
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"example": [
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".meta/example.s"
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]
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},
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"blurb": "Implement Conway's Game of Life.",
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"source": "Wikipedia",
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"source_url": "https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life"
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}

‎exercises/practice/game-of-life/.meta/example.s

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.text
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.globl tick
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/* extern void tick(uint64_t *buffer, const uint64_t *matrix, size_t row_count, size_t column_count); */
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tick:
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stp x22, x23, [sp, #-48]! /* preserve registers */
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stp x24, x25, [sp, #16]
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stp x26, x27, [sp, #32]
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cbz x2, .return /* 0 rows? */
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mov x5, xzr
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ldr x6, [x1], #8 /* read first row */
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.outer:
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add x2, x2, #-1
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mov x4, x5 /* previous row */
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mov x5, x6 /* current row */
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mov x6, xzr
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cbz x2, .process_row
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ldr x6, [x1], #8 /* read next row */
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.process_row:
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mov x17, xzr
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mov x14, x4
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mov x15, x5
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mov x16, x6
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and x23, x15, #1
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mov x25, xzr
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and x26, x16, #1
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add x26, x26, x23
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and x9, x14, #1
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add x26, x26, x9 /* total for first column across 3 rows */
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mov x13, x3 /* number of columns remaining */
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cbz x3, .write
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.inner:
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add x13, x13, #-1
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lsr x14, x14, #1 /* previous row, shifted */
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lsr x15, x15, #1 /* current row, shifted */
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lsr x16, x16, #1 /* next row, shifted */
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mov x22, x23 /* current cell */
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and x23, x15, #1 /* next cell */
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mov x24, x25 /* total for previous column across 3 rows */
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mov x25, x26 /* total for current column across 3 rows */
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and x26, x16, #1
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add x26, x26, x23
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and x9, x14, #1
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add x26, x26, x9 /* total for next column across 3 rows */
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add x27, x24, x25
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add x27, x27, x26
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sub x27, x27, x22 /* total of 8 neighbours */
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orr x27, x27, x22 /* if current cell is alive, treat 2 alive neighbours as 3 */
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cmp x27, #3
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cinc x17, x17, eq /* conditionally sets low bit */
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ror x17, x17, #1 /* rotate right */
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cbnz x13, .inner /* remaining columns? */
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.write:
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neg x9, x3
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rorv x17, x17, x9 /* rotate left by x3 */
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str x17, [x0], #8
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cbnz x2, .outer /* remaining rows? */
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.return:
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ldp x26, x27, [sp, #32] /* restore registers */
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ldp x24, x25, [sp, #16]
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ldp x22, x23, [sp], #48
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ret

‎exercises/practice/game-of-life/.meta/tests.toml

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# This is an auto-generated file.
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#
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# Regenerating this file via `configlet sync` will:
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# - Recreate every `description` key/value pair
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# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
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# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
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# - Preserve any other key/value pair
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#
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# As user-added comments (using the # character) will be removed when this file
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# is regenerated, comments can be added via a `comment` key.
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[ae86ea7d-bd07-4357-90b3-ac7d256bd5c5]
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description = "empty matrix"
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include = false
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[4ea5ccb7-7b73-4281-954a-bed1b0f139a5]
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description = "live cells with zero live neighbors die"
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[df245adc-14ff-4f9c-b2ae-f465ef5321b2]
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description = "live cells with only one live neighbor die"
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[2a713b56-283c-48c8-adae-1d21306c80ae]
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description = "live cells with two live neighbors stay alive"
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[86d5c5a5-ab7b-41a1-8907-c9b3fc5e9dae]
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description = "live cells with three live neighbors stay alive"
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[015f60ac-39d8-4c6c-8328-57f334fc9f89]
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description = "dead cells with three live neighbors become alive"
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[2ee69c00-9d41-4b8b-89da-5832e735ccf1]
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description = "live cells with four or more neighbors die"
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[a79b42be-ed6c-4e27-9206-43da08697ef6]
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description = "bigger matrix"

‎exercises/practice/game-of-life/Makefile

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ifeq ($(origin AS),default)
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AS = aarch64-linux-gnu-as
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endif
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ifeq ($(origin CC),default)
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CC = aarch64-linux-gnu-gcc
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endif
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CFLAGS ?= -g -Wall -Wextra -pedantic -Werror
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LDFLAGS =
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ALL_LDFLAGS = -pie -Wl,--fatal-warnings
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ALL_CFLAGS = -std=c99 -fPIE $(CFLAGS)
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ALL_LDFLAGS += $(LDFLAGS)
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C_OBJS = $(patsubst %.c,%.o,$(wildcard *.c))
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AS_OBJS = $(patsubst %.s,%.o,$(wildcard *.s))
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ALL_OBJS = $(filter-out example.o,$(C_OBJS) $(AS_OBJS) vendor/unity.o)
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CC_CMD = $(CC) $(ALL_CFLAGS) -c -o $@ $<
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PLATFORM = $(shell uname -m)
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ifeq ($(PLATFORM),aarch64)
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MAYBE_QEMU =
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else
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MAYBE_QEMU = qemu-aarch64 -L /usr/aarch64-linux-gnu
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endif
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all: tests
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@$(MAYBE_QEMU) ./$<
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tests: $(ALL_OBJS)
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@$(CC) $(ALL_CFLAGS) $(ALL_LDFLAGS) -o $@ $(ALL_OBJS)
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%.o: %.s
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@$(AS) -o $@ $<
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%.o: %.c
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@$(CC_CMD)
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vendor/unity.o: vendor/unity.c vendor/unity.h vendor/unity_internals.h
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@$(CC_CMD)
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clean:
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@rm -f *.o vendor/*.o tests
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.PHONY: all clean

‎exercises/practice/game-of-life/game_of_life.s

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.text
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.globl tick
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tick:
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ret

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