llvm/include/llvm/Bitcode/LLVMBitCodes.h

		@@ -754,6 +754,7 @@ enum AttributeKindCodes {
		ATTR_KIND_CORO_ONLY_DESTROY_WHEN_COMPLETE = 90,
		ATTR_KIND_DEAD_ON_UNWIND = 91,
		ATTR_KIND_RANGE = 92,
		+ ATTR_KIND_SANITIZE_NUMERICAL_STABILITY = 93,
		};
		enum ComdatSelectionKindCodes {

llvm/include/llvm/IR/Attributes.td

		@@ -285,6 +285,9 @@ def SanitizeHWAddress : EnumAttr<"sanitize_hwaddress", [FnAttr]>;
		/// MemTagSanitizer is on.
		def SanitizeMemTag : EnumAttr<"sanitize_memtag", [FnAttr]>;
		+/// NumericalStabilitySanitizer is on.
		+def SanitizeNumericalStability : EnumAttr<"sanitize_numerical_stability", [FnAttr]>;
		+
		/// Speculative Load Hardening is enabled.
		///
		/// Note that this uses the default compatibility (always compatible during
		@@ -372,6 +375,7 @@ def : CompatRule<"isEqual<SanitizeThreadAttr>">;
		def : CompatRule<"isEqual<SanitizeMemoryAttr>">;
		def : CompatRule<"isEqual<SanitizeHWAddressAttr>">;
		def : CompatRule<"isEqual<SanitizeMemTagAttr>">;
		+def : CompatRule<"isEqual<SanitizeNumericalStabilityAttr>">;
		def : CompatRule<"isEqual<SafeStackAttr>">;
		def : CompatRule<"isEqual<ShadowCallStackAttr>">;
		def : CompatRule<"isEqual<UseSampleProfileAttr>">;

llvm/lib/Bitcode/Reader/BitcodeReader.cpp

		@@ -2128,6 +2128,8 @@ static Attribute::AttrKind getAttrFromCode(uint64_t Code) {
		return Attribute::SanitizeThread;
		case bitc::ATTR_KIND_SANITIZE_MEMORY:
		return Attribute::SanitizeMemory;
		+ case bitc::ATTR_KIND_SANITIZE_NUMERICAL_STABILITY:
		+ return Attribute::SanitizeNumericalStability;
		case bitc::ATTR_KIND_SPECULATIVE_LOAD_HARDENING:
		return Attribute::SpeculativeLoadHardening;
		case bitc::ATTR_KIND_SWIFT_ERROR:

llvm/lib/Bitcode/Writer/BitcodeWriter.cpp

		@@ -828,6 +828,8 @@ static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
		return bitc::ATTR_KIND_SANITIZE_THREAD;
		case Attribute::SanitizeMemory:
		return bitc::ATTR_KIND_SANITIZE_MEMORY;
		+ case Attribute::SanitizeNumericalStability:
		+ return bitc::ATTR_KIND_SANITIZE_NUMERICAL_STABILITY;
		case Attribute::SpeculativeLoadHardening:
		return bitc::ATTR_KIND_SPECULATIVE_LOAD_HARDENING;
		case Attribute::SwiftError:

llvm/lib/Transforms/Utils/CodeExtractor.cpp

		@@ -954,6 +954,7 @@ Function *CodeExtractor::constructFunction(const ValueSet &inputs,
		case Attribute::ShadowCallStack:
		case Attribute::SanitizeAddress:
		case Attribute::SanitizeMemory:
		+ case Attribute::SanitizeNumericalStability:
		case Attribute::SanitizeThread:
		case Attribute::SanitizeHWAddress:
		case Attribute::SanitizeMemTag:

llvm/test/Bitcode/compatibility.ll

		@@ -1564,7 +1564,7 @@ exit:
		; CHECK: select <2 x i1> <i1 true, i1 false>, <2 x i8> <i8 2, i8 3>, <2 x i8> <i8 3, i8 2>
		call void @f.nobuiltin() builtin
		- ; CHECK: call void @f.nobuiltin() #51
		+ ; CHECK: call void @f.nobuiltin() #52
		call fastcc noalias ptr @f.noalias() noinline
		; CHECK: call fastcc noalias ptr @f.noalias() #12
		@@ -1988,6 +1988,8 @@ declare void @f.nosanitize_bounds() nosanitize_bounds
		declare void @f.allockind() allockind("alloc,uninitialized")
		; CHECK: declare void @f.allockind() #50
		+declare void @f.sanitize_numerical_stability() sanitize_numerical_stability
		+; CHECK: declare void @f.sanitize_numerical_stability() #51
		; CHECK: declare nofpclass(snan) float @nofpclass_snan(float nofpclass(snan))
		declare nofpclass(snan) float @nofpclass_snan(float nofpclass(snan))
		@@ -2110,7 +2112,8 @@ define float @nofpclass_callsites(float %arg) {
		; CHECK: attributes #48 = { allocsize(1,0) }
		; CHECK: attributes #49 = { nosanitize_bounds }
		; CHECK: attributes #50 = { allockind("alloc,uninitialized") }
		-; CHECK: attributes #51 = { builtin }
		+; CHECK: attributes #51 = { sanitize_numerical_stability }
		+; CHECK: attributes #52 = { builtin }
		;; Metadata