[libcxx-commits] [libcxxabi] 8be4bd8 - [libcxxabi] Fix the long double demangling for PowerPC (#135332)

[via libcxx-commits]

Author: Martin Storsjö
Date: 2025-04-11T12:24:13+03:00
New Revision: 8be4bd85708cddc8d84d03cf77ba4b02d0b6d44c

URL: https://github.com/llvm/llvm-project/commit/8be4bd85708cddc8d84d03cf77ba4b02d0b6d44c
DIFF: https://github.com/llvm/llvm-project/commit/8be4bd85708cddc8d84d03cf77ba4b02d0b6d44c.diff

LOG: [libcxxabi] Fix the long double demangling for PowerPC (#135332)

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.

Added: 
    

Modified: 
    libcxxabi/src/demangle/ItaniumDemangle.h

Removed: 
    


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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