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mac: disable bf16 on unsupported OS versions (#11585)

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Support for bf16 was added in MacOS v14+ and attempting to enable
on older versions causes runtime failures.
This commit is contained in:
Daniel Hiltgen
2025-07-30 08:50:54 -07:00
committed by GitHub
parent 8afa6e83f2
commit 25911a6e6b
3 changed files with 34 additions and 3 deletions
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27
llama/patches/0022-BF16-macos-version-guard.patch Normal file
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@@ -0,0 +1,27 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Daniel Hiltgen <daniel@ollama.com>
Date: Wed, 30 Jul 2025 08:43:46 -0700
Subject: [PATCH] BF16 macos version guard
Only enable BF16 on supported MacOS versions (v14+)
---
ggml/src/ggml-metal/ggml-metal.m | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/ggml/src/ggml-metal/ggml-metal.m b/ggml/src/ggml-metal/ggml-metal.m
index 110c9ece..ab46f6e3 100644
--- a/ggml/src/ggml-metal/ggml-metal.m
+++ b/ggml/src/ggml-metal/ggml-metal.m
@@ -89,7 +89,11 @@
ctx->has_bfloat |= [ctx->mtl_device supportsFamily:MTLGPUFamilyApple6];
#if defined(GGML_METAL_USE_BF16)
- ctx->use_bfloat = ctx->has_bfloat;
+ if (@available(macOS 14.0, *)) {
+ ctx->use_bfloat = ctx->has_bfloat;
+ } else {
+ ctx->use_bfloat = false;
+ }
#else
ctx->use_bfloat = false;
#endif