================
@@ -3532,6 +3533,72 @@ void CXXNameMangler::mangleExtFunctionInfo(const
FunctionType *T) {
// FIXME: noreturn
}
+enum class AAPCSBitmaskSME : unsigned {
+ ArmStreamingBit = 1 << 0,
+ ArmStreamingCompatibleBit = 1 << 1,
+ ArmAgnosticSMEZAStateBit = 1 << 2,
+ ZA_Shift = 3,
+ ZT0_Shift = 6,
+ NoState = 0b000,
+ ArmIn = 0b001,
+ ArmOut = 0b010,
+ ArmInOut = 0b011,
+ ArmPreserves = 0b100,
+ LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue=*/ArmPreserves)
+};
+
+static AAPCSBitmaskSME encodeAAPCSZAState(unsigned SMEAttrs) {
+ switch (SMEAttrs) {
+ case FunctionType::ARM_None:
+ return AAPCSBitmaskSME::NoState;
+ case FunctionType::ARM_In:
+ return AAPCSBitmaskSME::ArmIn;
+ case FunctionType::ARM_Out:
+ return AAPCSBitmaskSME::ArmOut;
+ case FunctionType::ARM_InOut:
+ return AAPCSBitmaskSME::ArmInOut;
+ case FunctionType::ARM_Preserves:
+ return AAPCSBitmaskSME::ArmPreserves;
+ default:
+ llvm_unreachable("Unrecognised SME attribute");
+ }
+}
+
+// The mangling scheme for function types which have SME attributes is
+// implemented as a "pseudo" template:
+//
+// '__SME_ATTRS<<normal_function_type>, <sme_state>>'
+//
+// Combining the function type with a bitmask representing the streaming and ZA
+// properties of the function's interface.
+//
+// Mangling of SME keywords is described in more detail in the AArch64 ACLE:
+//
https://github.com/ARM-software/acle/blob/main/main/acle.md#c-mangling-of-sme-keywords
+//
+void CXXNameMangler::mangleSMEAttrs(unsigned SMEAttrs) {
+ if (!SMEAttrs)
+ return;
+
+ unsigned Bitmask = 0;
+ if (SMEAttrs & FunctionType::SME_PStateSMEnabledMask)
+ Bitmask |= static_cast<unsigned>(AAPCSBitmaskSME::ArmStreamingBit);
----------------
sdesmalen-arm wrote:
You can remove the `static_cast` if you change `Bitmask` to `AAPCSBitmaskSME`.
Then the only place that still requires a bitcast is where you print `Bitmask`
to `Out`.
https://github.com/llvm/llvm-project/pull/114209
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