[clang] [llvm] [RISCV] Add Zilsd and Zclsd Extensions (PR #131094)

[Craig Topper via llvm-commits]

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@@ -401,6 +408,14 @@ def FeatureStdExtZcf
                      "Compressed Single-Precision Floating-Point Instructions",
                      [FeatureStdExtF, FeatureStdExtZca]>;
 
+def FeatureStdExtZclsd
+    : RISCVExtension<1, 0,
+                     "Compressed Load/Store pair instructions",
+                     [FeatureStdExtZilsd,FeatureStdExtZca]>;     
+def HasStdExtZclsd : Predicate<"Subtarget->hasStdExtZclsd() && !Subtarget->hasStdExtZcf()">,
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topperc wrote:

The conflict with Zcf needs to be checked in `RISCVISAInfo::checkDependency` in llvm/lib/TargetParser/RISCVISAInfo.cpp 

https://github.com/llvm/llvm-project/pull/131094