| # Bifrost compiler | |
| ## Register file | |
| Defined partially in software, partially in hardware. | |
| ## Blend shaders | |
| R0 - R3: input (color #0) | |
| R4 - R7: input (color #1) | |
| R8 - R15: general purpose | |
| R48: return address | |
| ## Fragment | |
| Anything live during BLEND must respect blend shader registers. | |
| R0 - R3: preloaded (message #0) | |
| R4 - R7: preloaded (message #1) | |
| R57 - R63: preloaded (various) | |
| R0 - R15: general purpose (full threads) | |
| R48 - R63: general purpose (full threads) | |
| R32 - R47: general purpose (half threads, or v6) |