[clang] [llvm] [clang][NVPTX] Add support for mixed-precision FP arithmetic (PR #168359)

[Srinivasa Ravi via llvm-commits]

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@@ -1443,15 +1445,31 @@ let TargetPrefix = "nvvm" in {
   // Add
   //
   let IntrProperties = [IntrNoMem, IntrSpeculatable, Commutative] in {
-    foreach rnd = ["rn", "rz", "rm", "rp"] in {
-      foreach ftz = ["", "_ftz"] in
-        def int_nvvm_add_ # rnd # ftz # _f : NVVMBuiltin,
-          DefaultAttrsIntrinsic<[llvm_float_ty], [llvm_float_ty, llvm_float_ty]>;
-
-      def int_nvvm_add_ # rnd # _d : NVVMBuiltin,
+    foreach rnd = ["_rn", "_rz", "_rm", "_rp"] in {
+      foreach ftz = ["", "_ftz"] in {
+        foreach sat = ["", "_sat"] in {
+          def int_nvvm_add # rnd # ftz # sat # _f : NVVMBuiltin,
+            DefaultAttrsIntrinsic<[llvm_float_ty], [llvm_float_ty, llvm_float_ty]>;
+        } // sat
+      } // ftz
+      def int_nvvm_add # rnd # _d : NVVMBuiltin,
           DefaultAttrsIntrinsic<[llvm_double_ty], [llvm_double_ty, llvm_double_ty]>;
-    }
+    } // rnd
   }
+  
+  //
+  // Sub
+  //
+  foreach rnd = ["_rn", "_rz", "_rm", "_rp"] in {
+    foreach ftz = ["", "_ftz"] in {
+      foreach sat = ["", "_sat"] in {
+        def int_nvvm_sub # rnd # ftz # sat # _f : NVVMBuiltin,
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Wolfram70 wrote:

Added a DAG combine to fold `fneg` with the `add` intrinsics to `sub` similar to https://github.com/llvm/llvm-project/pull/170079. Please take a look, thanks!

https://github.com/llvm/llvm-project/pull/168359