[llvm] [AArch64] Check for streaming mode in HasSME* features. (PR #96302)

[Paul Walker via llvm-commits]

================
@@ -198,39 +204,39 @@ def HasSSVE_FP8DOT4  : Predicate<"Subtarget->hasSSVE_FP8DOT4() || "
                                  "ssve-fp8dot4 or (sve2 and fp8dot4)">;
 def HasLUT          : Predicate<"Subtarget->hasLUT()">,
                                  AssemblerPredicateWithAll<(all_of FeatureLUT), "lut">;
-def HasSME_LUTv2     : Predicate<"Subtarget->hasSME_LUTv2()">,
+def HasSME_LUTv2     : Predicate<"Subtarget->isStreaming() && Subtarget->hasSME_LUTv2()">,
                                  AssemblerPredicateWithAll<(all_of FeatureSME_LUTv2), "sme-lutv2">;
-def HasSMEF8F16     : Predicate<"Subtarget->hasSMEF8F16()">,
+def HasSMEF8F16     : Predicate<"Subtarget->isStreaming() && Subtarget->hasSMEF8F16()">,
                                  AssemblerPredicateWithAll<(all_of FeatureSMEF8F16), "sme-f8f16">;
-def HasSMEF8F32     : Predicate<"Subtarget->hasSMEF8F32()">,
+def HasSMEF8F32     : Predicate<"Subtarget->isStreaming() && Subtarget->hasSMEF8F32()">,
                                  AssemblerPredicateWithAll<(all_of FeatureSMEF8F32), "sme-f8f32">;
 
 // A subset of SVE(2) instructions are legal in Streaming SVE execution mode,
 // they should be enabled if either has been specified.
 def HasSVEorSME
-    : Predicate<"Subtarget->hasSVEorSME()">,
+    : Predicate<"Subtarget->isSVEorStreamingSVEAvailable()">,
                 AssemblerPredicateWithAll<(any_of FeatureSVE, FeatureSME),
                 "sve or sme">;
 def HasSVE2orSME
-    : Predicate<"Subtarget->hasSVE2() || Subtarget->hasSME()">,
+    : Predicate<"Subtarget->isSVEorStreamingSVEAvailable() && (Subtarget->hasSVE2() || Subtarget->hasSME())">,
----------------
paulwalker-arm wrote:

As discussed this logic will likely need to be a function in its own right because when building with `+sve+sme` this logic will return true when isStreaming is false but the required SVE feature is not available. Same goes for the other `HasSVEor...` predicates.

https://github.com/llvm/llvm-project/pull/96302