fhahn added inline comments.

================
Comment at: clang/lib/Driver/ToolChains/Darwin.cpp:2492
+  // Darwin_libsystem_m for iOS based targets.
+  if (isTargetIOSBased() && !DriverArgs.hasArgNoClaim(options::OPT_fveclib))
+    CC1Args.push_back("-fveclib=Darwin_libsystem_m");
----------------
arphaman wrote:
> Is this applicable to the watchOS targets as well? The iOS based check 
> doesn't cover it.
`libsystem_m`'s vector functions should be available on all Darwin platforms I 
think. I'd gradually opt-in additional platforms, once we verified it is 
clearly beneficial for each platform individually.

Should I add a TODO?


================
Comment at: clang/test/Driver/darwin-veclib-default.c:9
+
+// RUN: %clang -target arm64-apple-darwinos -S -### %s -arch arm64 2>&1 | \
+// RUN:   FileCheck --check-prefix CHECK-IOS-DEFAULT %s
----------------
arphaman wrote:
> `darwinos` isn't a valid OS type, what's your intent with this testcase here?
Ah OK! Would it make sense to check `-darwin`? Or just `-iOS`?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D102494/new/

https://reviews.llvm.org/D102494

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