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Add PPC64 iMac G5 build support

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owen
2026-07-17 18:21:31 -05:00
parent 7e2360c104
commit 438cc58b02
5 changed files with 89 additions and 9 deletions
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README.md
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@@ -6,7 +6,7 @@ across every available core. The final report includes separate single-core and
multicore scores.
The repository currently builds an executable named `fossmark` for ARM64,
x86-64, and 32-bit big-endian PowerPC. The C driver handles timing, memory,
x86-64, and 32- or 64-bit big-endian PowerPC. The C driver handles timing, memory,
threads, output, and scoring. Performance-sensitive kernels live in
architecture-specific backend files.
@@ -51,18 +51,20 @@ Other targets are available for explicit platforms and architectures:
make linux-arm64
make linux-amd64
make linux-ppc32be
make linux-ppc64be # PowerPC 970 / iMac G5
make macos-arm64
make macos-amd64
make all
```
`make all` builds all three Linux targets. Cross-compilation requires a suitable
`make all` builds all four Linux targets. Cross-compilation requires a suitable
toolchain. Override the target compiler when its name differs from the default:
```sh
make linux-arm64 CC_ARM64=aarch64-linux-gnu-gcc
make linux-amd64 CC_AMD64=x86_64-linux-gnu-gcc
make linux-ppc32be CC_PPC32BE=powerpc-linux-gnu-gcc
make linux-ppc64be CC_PPC64BE=powerpc64-linux-gnu-gcc
```
Apple Clang can build either macOS architecture with `-arch`. Windows timing
@@ -93,6 +95,10 @@ make CFLAGS='-O2 -Wall -Wextra -DFM_API_BASE_URL=\"https://bench.example.com\"'
HTTPS uploads use OpenSSL with certificate and hostname verification.
The PPC64 target is big-endian and is compiled for the PowerPC 970 with
AltiVec, matching the CPU used by the iMac G5. It targets 64-bit Linux; use a
PowerPC64 Linux installation or live environment on the machine to run it.
Release binaries statically include OpenSSL. Linux releases are fully static;
macOS releases retain only Apple's required system-library linkage because the
macOS toolchain does not support fully static executables.
@@ -101,7 +107,7 @@ macOS toolchain does not support fully static executables.
Pushing a Git tag runs the GitHub Actions build and correctness tests. If they
succeed, the workflow creates a GitHub Release named `Release <tag name>` with
Linux archives for AMD64, ARM64, and PPC32 big-endian, macOS archives for AMD64
Linux archives for AMD64, ARM64, PPC32 big-endian, and PPC64 big-endian; macOS archives for AMD64
and ARM64, and a `SHA256SUMS` file.
## Scores
@@ -149,6 +155,8 @@ The kernel backends use only baseline instructions for their architecture:
the device-tree `compatible` property begins with `nintendo,`; otherwise it
selects VSX, AltiVec, or the scalar fallback in that order according to
Linux `AT_HWCAP`.
* The same C backend builds for 64-bit big-endian PowerPC. Its PPC64 path uses
the PowerPC 970's AltiVec unit and leaves out the PPC32-only assembly helpers.
The PPC32 build uses a 2 MiB pointer-chase cycle, which exceeds the 750CL's L2
cache while keeping peak benchmark memory consumption below 32 MiB. Other
@@ -183,7 +191,7 @@ with a nonzero status if any check fails.
src/main.c portable benchmark driver and scoring
src/fossmark.S ARM64 kernels
src/fossmark_x86_64.S x86-64 kernels
src/fossmark_ppc32.c PPC32 big-endian kernels
src/fossmark_ppc32.c PPC32/PPC64 big-endian kernels
src/fossmark_ppc32_ext.S optional PPC32 PS, VSX, and AltiVec kernels
src/test_kernels.c correctness suite
Makefile native and cross-build targets