[libcxx-commits] [libcxxabi] [libcxxabi] Fix the long double demangling for PowerPC (PR #135332)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libcxxabi

Author: Martin Storsjö (mstorsjo)

<details>
<summary>Changes</summary>

PowerPC uses a slightly different type of floats for their 128 bit long doubles, as "double-double", with __LDBL_MANT_DIG__ == 106 rather than __LDBL_MANT_DIG__ == 113 for IEEE 128 bit floats.

This fixes compiling libcxxabi for PowerPC after
3b70715c13876c51542ebfe2e3f4ee908f6785cb.

---
Full diff: https://github.com/llvm/llvm-project/pull/135332.diff


1 Files Affected:

- (modified) libcxxabi/src/demangle/ItaniumDemangle.h (+1-1) 


``````````diff
diff --git a/libcxxabi/src/demangle/ItaniumDemangle.h b/libcxxabi/src/demangle/ItaniumDemangle.h
index b9d17060c04f9..eca9ddad66f92 100644
--- a/libcxxabi/src/demangle/ItaniumDemangle.h
+++ b/libcxxabi/src/demangle/ItaniumDemangle.h
@@ -5741,7 +5741,7 @@ struct FloatData<double>
 template <>
 struct FloatData<long double>
 {
-#if __LDBL_MANT_DIG__ == 113
+#if __LDBL_MANT_DIG__ == 113 || __LDBL_MANT_DIG__ == 106
   static const size_t mangled_size = 32;
 #elif __LDBL_MANT_DIG__ == 53 || defined(_MSC_VER)
   // MSVC doesn't define __LDBL_MANT_DIG__, but it has long double equal to

``````````

</details>


https://github.com/llvm/llvm-project/pull/135332