[clang] Don't do casting of atomic FP loads/stores in FE. (PR #83446)

[Jonas Paulsson via cfe-commits]

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@@ -1410,13 +1414,14 @@ RValue AtomicInfo::ConvertIntToValueOrAtomic(llvm::Value *IntVal,
     auto *ValTy = AsValue
                       ? CGF.ConvertTypeForMem(ValueTy)
                       : getAtomicAddress().getElementType();
-    if (ValTy->isIntegerTy()) {
-      assert(IntVal->getType() == ValTy && "Different integer types.");
-      return RValue::get(CGF.EmitFromMemory(IntVal, ValueTy));
+    if (ValTy->isIntegerTy() || (!CastFP && ValTy->isIEEELikeFPTy())) {
+      assert((!ValTy->isIntegerTy() || Val->getType() == ValTy) &&
+             "Different integer types.");
+      return RValue::get(CGF.EmitFromMemory(Val, ValueTy));
     } else if (ValTy->isPointerTy())
-      return RValue::get(CGF.Builder.CreateIntToPtr(IntVal, ValTy));
-    else if (llvm::CastInst::isBitCastable(IntVal->getType(), ValTy))
-      return RValue::get(CGF.Builder.CreateBitCast(IntVal, ValTy));
+      return RValue::get(CGF.Builder.CreateIntToPtr(Val, ValTy));
+    else if (llvm::CastInst::isBitCastable(Val->getType(), ValTy))
+      return RValue::get(CGF.Builder.CreateBitCast(Val, ValTy));
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JonPsson1 wrote:

As AtomicExpandPass doesn't do any casting of AtomicCmpXchg - at least currently - I think the other users of ConvertIntToValueOrAtomic() (which emit AtomicCmpXchg) need the current behavior.

https://github.com/llvm/llvm-project/pull/83446