git:20260821.71d8484 to git:20260918.792b4a6

---

name: compiler-sccz80

description: >

sccz80 classic C compiler for z88dk: calling conventions, copt peephole path,

8080/8085/z80 runtime under libsrc/l/sccz80. Use when debugging sccz80 codegen

or classic -compiler=sccz80 builds.

---

# Compiler — sccz80

Binary: `z88dk-sccz80` (normally via `zcc`). Source: `src/sccz80/`.

## Agent facts

| Topic | Detail |

|-------|--------|

| Default | Many classic targets use sccz80 |

| Peephole | `z88dk-copt` + `lib/z80rules.*` on **compiler output only** |

| Runtime | `libsrc/l/sccz80/` per CPU (`5-z80`, `7-8085`, `8-8080`, …) |

| Inline ints | May load `z80rules.8` — see `tool-copt` |

| Float rewrite | sccz80 may rewrite `1.0f/x` → `inv(x)`; force runtime numerator to hit `fsdiv` |

## Condensed wiki

# Tool — z88dk-sccz80

Native C compiler. Normally invoked through **zcc**, not directly.

## When to use direct invocation

Rare. Prefer `zcc +target …`. Use the binary directly only when debugging the compiler front end.

## Select via zcc

Default for most classic CLIBs and for `-clib=new`. See [Compilers](Compilers).

## Help

```text

Small-C/Plus - z80 Crosscompiler Version: 25141-6b30e0885e-20260716

(C) 1980-2025 Cain, Van Zandt, Hendrix, Yorston, z88dk

Usage: z88dk-sccz80 [flags] [file]

-v -verbose Be verbose

-h -help Show this help page

-o -output Set the output filename

CPU Targetting:

-m8080 Generate output for the i8080

-m8085 Generate output for the i8085

-mez80_z80 Generate output for the ez80 in z80 mode

-mz80 Generate output for the z80

-mz80n Generate output for the z80n

-mz180 Generate output for the z180

-mr2ka Generate output for the Rabbit 2000A

-mr3k Generate output for the Rabbit 3000

-mr4k Generate output for the Rabbit 4000

-mr6k Generate output for the Rabbit 4000

-mgbz80 Generate output for the Gameboy CPU

-mkc160 Generate output for the KC160

Code generation options

-unsigned Make all types unsigned

--disable-builtins Disable builtin functions

-params-offset =<num> Base offset for the function parameters (default: 2)

-doublestr Store FP constants as strings

-math-z88 (deprecated) Make FP constants match z88

-banked-style=regular Use regular banked calling style

-banked-style=ti Use ticalc banked calling style

-fp-exponent-bias =<num> FP exponent bias (default: 128)

-fp-mantissa-size =<num> FP mantissa size (default: 5 bytes)

-fp-mode=z80 Use 48 bit doubles

-fp-mode=ieee Use 32 bit IEEE doubles

-fp-mode=mbf32 Use 32 bit Microsoft Binary format

-fp-mode=mbf40 Use 40 bit Microsoft binary format

-fp-mode=mbf64 Use 64 bit Microsoft binary format

-fp-mode=z88 Use 40 bit z88 doubles

-fp-mode=am9511 Use 32 bit AM9511 doubles

-noaltreg Try not to use the alternative register set

-standard-escape-chars Use standard mappings for \r and \n

-set-r2l-by-default Use r->l calling convention by default

--constseg =<name> Set the const section name

--codeseg =<name> Set the code section name

--bssseg =<name> Set the bss section name

--dataseg =<name> Set the data section name

--

… (more in wiki page)

## Related

- `tool-copt`, `tool-zcc`, `library-classic`, `cpu-8085`