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| author | Kartik Agaram <vc@akkartik.com> | 2019-04-11 08:06:13 -0700 |
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| committer | Kartik Agaram <vc@akkartik.com> | 2019-04-11 08:06:13 -0700 |
| commit | a8cea00a29892be8f6481c5abdbc95cd1c1d4b83 (patch) | |
| tree | eddcb001a5d49220d11be7636db1cdcbe61c2d69 | |
| parent | 09492d3867b5da6d0b2f21b139d097cd481a8fa1 (diff) | |
| download | mu-a8cea00a29892be8f6481c5abdbc95cd1c1d4b83.tar.gz | |
5078
| -rw-r--r-- | subx/Readme.md | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/subx/Readme.md b/subx/Readme.md index c0a11c42..2107bd96 100644 --- a/subx/Readme.md +++ b/subx/Readme.md @@ -86,15 +86,15 @@ small subset of the 32-bit x86 instruction set that likely runs on your computer. (Think of the name as short for "sub-x86".) Instructions operate on a few registers: -* 6 general-purpose 32-bit registers: EAX, EBX, ECX, EDX, ESI and EDI -* 2 additional 32-bit registers: ESP and EBP (I suggest you only use these to +* Six general-purpose 32-bit registers: EAX, EBX, ECX, EDX, ESI and EDI +* Two additional 32-bit registers: ESP and EBP (I suggest you only use these to manage the call stack.) -* 3 bit-size _flag_ registers for conditional branching: +* Three 1-bit _flag_ registers for conditional branching: - zero/equal flag ZF - sign flag SF - overflow flag OF -SubX programs consist of instructions like `89/copy`, `01/add`, `39/compare` +SubX programs consist of instructions like `89/copy`, `01/add`, `3d/compare` and `52/push-ECX` which modify these registers as well as a byte-addressable memory. For a complete list of supported instructions, run `subx help opcodes`. |