[llvm] [AArch64] Consider runtime mode when deciding to use SVE for fixed-length vectors. (PR #96081)

[Sander de Smalen via llvm-commits]

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@@ -185,6 +185,12 @@ class AArch64Subtarget final : public AArch64GenSubtargetInfo {
            (hasSMEFA64() || (!isStreaming() && !isStreamingCompatible()));
   }
 
+  /// Returns true if the target has access to either the full range of SVE instructions,
+  /// or the streaming-compatible subset of SVE instructions.
+  bool isSVEorStreamingSVEAvailable() const {
+    return hasSVE() || hasSMEFA64() || (hasSME() && isStreaming());
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sdesmalen-arm wrote:

Good point, I agree that it shouldn't have been included here. I'll remove it.

https://github.com/llvm/llvm-project/pull/96081