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Matt Mascarenhas 2018-06-26 22:55:14 +01:00
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[video member=pervognsen stream_platform=twitch project=bitwise medium=speech title="How To Program Assembly, Part 3" vod_platform=youtube id=7ye-sMA15Qs annotator=Miblo]
[0:00][Recap and set the stage for the final part of the assembly writing tutorial][:asm]
[0:30][Shout-out to godbolt[ref
site="Compiler Explorer"
url=https://godbolt.org/] for its assembly exploration capabilities][:asm :research]
[4:25][Switch statements][:asm :language]
[8:15][Implementing switch using a jump table][:language]
[15:10][Throw a switch statement into godbolt[ref
site="Compiler Explorer"
url=https://godbolt.org/] to see what riscv32 clang and x86-64 MSVC generate][:asm :research]
[21:36][Compressing a lookup table when it has few distinct entries relative to the total number of keys][:compression :memory]
[24:28][Lowering a jump table-based switch statement, without the compressed table indirection, from C to assembly][:asm :language]
[38:14][Functions[ref
author="Andrew Waterman and Krste Asanović"
title="The RISC-V Instruction Set Manual - Volume 1: User-Level ISA"
url=https://github.com/riscv/riscv-isa-manual/blob/master/release/riscv-spec-v2.2.pdf]][:asm :language]
[51:55][Calls and returns, and RISC-V's JAL and JMP instructions][:asm :isa :language]
[58:35][Lowering our example fact() function from C to assembly[ref
author="Andrew Waterman and Krste Asanović"
title="The RISC-V Instruction Set Manual - Volume 1: User-Level ISA"
url=https://github.com/riscv/riscv-isa-manual/blob/master/release/riscv-spec-v2.2.pdf]][:asm :language]
[1:07:00][@cubercaleb][What is meant by the function epilogue and prologue? Is that just a fancy way of saying "stack setup and tear-down", or does something actually happen?[ref
site=Wikipedia
page="Function prologue"
url=https://en.wikipedia.org/wiki/Function_prologue]]
[1:07:59][Lowering fact() from C to assembly using a callee-save register][:asm :language]
[1:13:18][Designating registers as caller- vs callee-save, as demonstrated by leaf functions][:asm :language]
[1:17:33][Summarise the handling of more complex functions][:asm :language]
[1:18:30][@cubercaleb][Isn't ret a CISC-like instruction, e.g. MIPS requires `jr $ra`?[ref
author="Andrew Waterman and Krste Asanović"
title="The RISC-V Instruction Set Manual - Volume 1: User-Level ISA"
url=https://github.com/riscv/riscv-isa-manual/blob/master/release/riscv-spec-v2.2.pdf]][:isa]
[1:20:53][Consider going on to nested / compound expressions][:asm :language]
[1:21:43][Note the assumption that local variables don't need to be spilt][:asm :language :memory]
[1:25:08][Flattening expressions and register allocations][:asm :language :memory]
[1:29:30][Flattening a right-associative expression[ref
site=Wikipedia
page="Sethi–Ullman algorithm"
url=https://en.wikipedia.org/wiki/Sethi%E2%80%93Ullman_algorithm]][:asm :language :memory]
[1:36:02][Summarise the expression and register allocations information][:asm :language :memory]
[1:37:18][That's it for today]
[/video]