================
@@ -2381,11 +2392,104 @@ def AArch64SystemLibrary :
SystemRuntimeLibrary<isAArch64_ExceptArm64EC,
["compiler-rt", "libatomic", "llvm-client-runtime", "libm", "libc", "unwind",
"sme"]>;
+//===----------------------------------------------------------------------===//
+// ARM64EC helpers for the x87 `long double` format
+//===----------------------------------------------------------------------===//
+
+// These are not the exact x87 soft-float helpers of libgcc: The value stays
+// an 80-bit x87 image in a 16-byte slot, but every operation on it is carried
+// out in `double`. These are named with an `__arm64ec_` prefix so they will
+// not be confused with, or silently bound to, an exact implementation of the
+// same format.
----------------
arsenm wrote:
Ideally that would happen first
https://github.com/llvm/llvm-project/pull/237057
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