[llvm] Add constant-folding for unary NVVM intrinsics (PR #141233)

[Lewis Crawford via llvm-commits]

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@@ -2548,6 +2653,170 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
         return ConstantFoldFP(atan, APF, Ty);
       case Intrinsic::sqrt:
         return ConstantFoldFP(sqrt, APF, Ty);
+
+      // NVVM Intrinsics:
+      case Intrinsic::nvvm_ceil_ftz_f:
+      case Intrinsic::nvvm_ceil_f:
+      case Intrinsic::nvvm_ceil_d:
+        return ConstantFoldFP(
+            ceil, APF, Ty,
+            nvvm::GetNVVMDenromMode(
+                nvvm::UnaryMathIntrinsicShouldFTZ(IntrinsicID)));
+
+      case Intrinsic::nvvm_cos_approx_ftz_f:
+      case Intrinsic::nvvm_cos_approx_f:
+        return ConstantFoldFP(
+            cos, APF, Ty,
+            nvvm::GetNVVMDenromMode(
+                nvvm::UnaryMathIntrinsicShouldFTZ(IntrinsicID)));
+
+      case Intrinsic::nvvm_ex2_approx_ftz_f:
+      case Intrinsic::nvvm_ex2_approx_d:
+      case Intrinsic::nvvm_ex2_approx_f:
+        return ConstantFoldFP(
+            exp2, APF, Ty,
+            nvvm::GetNVVMDenromMode(
+                (nvvm::UnaryMathIntrinsicShouldFTZ(IntrinsicID))));
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LewisCrawford wrote:

Ok, I have removed all "approx" intrinsic folding from the patch now.

https://github.com/llvm/llvm-project/pull/141233