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keep macOS CPU targeting consistent with EOL/supported macOS versions #2633

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Sep 17, 2024
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keep macOS CPU targeting consistent with EOL/supported macOS versions #2633

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18 changes: 5 additions & 13 deletions config.nims
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Original file line number Diff line number Diff line change
Expand Up @@ -90,19 +90,11 @@ if defined(windows):
if defined(disableMarchNative):
if defined(i386) or defined(amd64):
if defined(macosx):
# https://support.apple.com/kb/sp803
# "macOS Catalina - Technical Specifications": EOL as of 2022-09
# https://support.apple.com/kb/sp833
# "macOS Big Sur - Technical Specifications" lists current oldest
# supported models: MacBook (2015 or later), MacBook Air (2013 or later),
# MacBook Pro (Late 2013 or later), Mac mini (2014 or later), iMac (2014
# or later), iMac Pro (2017 or later), Mac Pro (2013 or later).
#
# These all have Haswell or newer CPUs.
#
# This ensures AVX2, AES-NI, PCLMUL, BMI1, and BMI2 instruction set support.
switch("passC", "-march=haswell -mtune=generic")
switch("passL", "-march=haswell -mtune=generic")
# https://support.apple.com/en-us/102861
# "macOS Ventura is compatible with these computers" lists current oldest
# supported x86 models, all of which have Kaby Lake or newer CPUs.
switch("passC", "-march=skylake -mtune=generic")
switch("passL", "-march=skylake -mtune=generic")
else:
switch("passC", "-mssse3")
switch("passL", "-mssse3")
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