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Switching long double from 64 to 128 bit with aix6.1 was based on an old bug
in AIX libc, which can not really be fixed due to backwards compatibility,
just worked around in math.h. The default for long double still is 64bit.
http://gcc.gnu.org/PR46481
--- gcc/config/rs6000/aix61.h.orig 2010-11-15 12:59:04.008438153 +0100
+++ gcc/config/rs6000/aix61.h 2010-11-15 12:59:43.801763387 +0100
@@ -193,4 +193,5 @@
/* This target uses the aix64.opt file. */
#define TARGET_USES_AIX64_OPT 1
-#define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
+/* keep default 64bit for 'long double': PR46481 */
+#define RS6000_DEFAULT_LONG_DOUBLE_SIZE 64
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