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authorKartik K. Agaram <vc@akkartik.com>2014-11-26 08:48:06 -0800
committerKartik K. Agaram <vc@akkartik.com>2014-11-26 08:48:06 -0800
commit711dd36f9eb81fcd51a5fd891b7dae7e7aa53de4 (patch)
tree12874de03c974e2a5a2ef00a2266d96aed7be9f4 /Readme.md
parent797a46d51c80554d05edb3f64211066b0c940972 (diff)
downloadmu-711dd36f9eb81fcd51a5fd891b7dae7e7aa53de4.tar.gz
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@@ -163,9 +163,7 @@ Another example, this time with concurrency.
 Notice that it repeatedly prints either '34' or '35' at random. Hit ctrl-c to
 stop.
 
----
-
-Another example forks two 'routines' that communicate over a channel:
+Yet another example forks two 'routines' that communicate over a channel:
 
 ```shell
   $ ./anarki/arc mu.arc channel.mu

 

generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-06-02 10:43:46 +0000


 


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# A function which pushes n zeros on the stack.
# Not really useful to call manually.
# The Mu compiler uses it when defining arrays on the stack.

== code

#? Entry:
#?     # . prologue
#?     89/<- %ebp 4/r32/esp
#?     #
#?     68/push 0xfcfdfeff/imm32
#?     b8/copy-to-eax 0x34353637/imm32
#? $dump-stack0:
#?     (push-n-zero-bytes 4)
#?     68/push 0x20/imm32
#? $dump-stack9:
#?     b8/copy-to-eax 1/imm32/exit
#?     cd/syscall 0x80/imm8

# This is not a regular function, so it won't be idiomatic.
# Registers must be properly restored.
# Registers can be spilled, but that modifies the stack and needs to be
# cleaned up.

# Overhead:
#   62 + n*6 instructions to push n bytes.
# If we just emitted code to push n zeroes, it would be:
#   5 bytes for 4 zero bytes, so 1.25 bytes per zero. And that's not even
#   instructions.
# But on the other hand it would destroy the instruction cache, where this
# approach requires 15 instructions, fixed.

# n must be positive
push-n-zero-bytes:  # n: int
$push-n-zero-bytes:prologue:
    89/<- *Push-n-zero-bytes-ebp 5/r32/ebp  # spill ebp without affecting stack
    89/<- %ebp 4/r32/esp
$push-n-zero-bytes:copy-ra:
    # -- esp = ebp
    50/push-eax
    # -- esp+8 = ebp+4
    # -- esp+4 = ebp
    8b/-> *(esp+4) 0/r32/eax
    2b/subtract *(ebp+4) 4/r32/esp
    # -- esp+4+n = ebp
    89/<- *(esp+4) 0/r32/eax
    58/pop-to-eax
    # -- esp+n = ebp
$push-n-zero-bytes:bulk-cleaning:
    89/<- *Push-n-zero-bytes-esp 4/r32/esp
    81 0/subop/add *Push-n-zero-bytes-esp 4/imm32
    81 0/subop/add *(ebp+4) 4/imm32
    (zero-out *Push-n-zero-bytes-esp *(ebp+4))  # n+4
$push-n-zero-bytes:epilogue:
    8b/-> *Push-n-zero-bytes-ebp 5/r32/ebp  # restore spill
    c3/return

== data
Push-n-zero-bytes-ebp:  # (addr int)
  0/imm32
Push-n-zero-bytes-esp:  # (addr int)
  0/imm32



 

generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-06-02 10:43:47 +0000