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[Bugfix][CPU] Make the Apple Silicon BF16 probe fall back instead of raising #51627

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Merged
bigPYJ1151 merged 1 commit into from
Aug 11, 2026
+8 −5
Merged

[Bugfix][CPU] Make the Apple Silicon BF16 probe fall back instead of raising #51627

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13 changes: 8 additions & 5 deletions vllm/platforms/cpu.py
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Original file line number Diff line number Diff line change
Expand Up @@ -54,12 +54,15 @@ def supported_dtypes(self) -> list[torch.dtype]:
elif self.get_cpu_architecture() == CpuArchEnum.ARM and sys.platform.startswith(
"darwin"
):
if (
subprocess.check_output(
["sysctl -n hw.optional.arm.FEAT_BF16"], shell=True
).strip()
# sysctl exits non-zero when the OID is absent, so check_output would
# raise instead of letting the fp16/fp32 fallback below run.
bf16 = (
subprocess.run(
["sysctl", "-n", "hw.optional.arm.FEAT_BF16"], capture_output=True
).stdout.strip()
== b"1"
):
)
if bf16:
return [torch.bfloat16, torch.float16, torch.float32]
return [torch.float16, torch.float32]
elif self.get_cpu_architecture() == CpuArchEnum.RISCV:
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