diff options
| author | Test_User <hax@andrewyu.org> | 2022-11-17 00:08:58 -0500 |
|---|---|---|
| committer | Test_User <hax@andrewyu.org> | 2022-11-17 00:08:58 -0500 |
| commit | c98515e7bcede03bc9334e060f6386ef1e653801 (patch) | |
| tree | affa8f1fcf3dcc9df79099ed0e1eefda4a09e5f8 | |
| parent | b353a1f88da821e80183f613bc8179b1d0b2fdf9 (diff) | |
| download | specification-c98515e7bcede03bc9334e060f6386ef1e653801.tar.gz specification-c98515e7bcede03bc9334e060f6386ef1e653801.zip | |
More VLIW format ideas
| -rw-r--r-- | cpu/instructions/overview.txt | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/cpu/instructions/overview.txt b/cpu/instructions/overview.txt index 9708e27..3cfe266 100644 --- a/cpu/instructions/overview.txt +++ b/cpu/instructions/overview.txt @@ -15,10 +15,11 @@ Dynamic VLIW A) effects: uses space efficiently when using many repetitions of the same opcodes + allows reuse of immediate references easier for the CPU to parse requires all parameter lengths to be the same within the opcode - wastes space when few repetitions of the same opcode exists + wastes space when few repetitions of the same opcode exists and immediate references are rarely reused format: num_opcodes @@ -44,6 +45,23 @@ Dynamic VLIW parameters immediate references + C) + effects: + allows variable length parameters + allows reuse of immediate references + + harder for the CPU to parse + larger if immediate references are not reused + + format: + size_of_instructions + for each instruction: + opcode + parameters + size_of_immediate_references + for each: + value + A minimum of <n> instructions must be accepted by all CPUs TODO: define n Specific implementations may accept more, up to the maximum specifiable by the format |