From 97cc937382f7a8393c9b4862eb67c50b16f21190 Mon Sep 17 00:00:00 2001 From: Jonathan Helmus Date: Tue, 6 Feb 2018 15:00:37 -0500 Subject: [PATCH 1/2] ppc64le uses special algorithm for long double --- config/cmake/ConversionTests.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff -urN a/config/cmake/ConversionTests.c b/config/cmake/ConversionTests.c --- a/config/cmake/ConversionTests.c 2021-07-02 00:26:38.000000000 +0300 +++ b/config/cmake/ConversionTests.c 2022-06-14 15:00:09.390272986 +0300 @@ -34,6 +34,13 @@ unsigned char s2[8]; int ret = 1; + #if defined __powerpc64__ && defined _LITTLE_ENDIAN + /* Don't bother checking on ppc64le, we know it'll work, and + * that what hdf5 calls 'special algorithm' simply is + * IBM ldouble 128 (i.e. two seperately scaled doubles). + * The check below assumes big endian. */ + ret = 0; + #endif if(sizeof(long double) == 16 && sizeof(long) == 8) { /*make sure the long double type has 16 bytes in size and * 11 bits of exponent. If it is, @@ -94,6 +101,13 @@ unsigned char s[16]; int flag=0, ret=1; + #if defined __powerpc64__ && defined _LITTLE_ENDIAN + /* Don't bother checking on ppc64le, we know it'll work, and + * that what hdf5 calls 'special algorithm' simply is + * IBM ldouble 128 (i.e. two seperately scaled doubles). + * The check below assumes big endian. */ + ret = 0; + #endif /*Determine if long double has 16 byte in size, 11 bit exponent, and *the bias is 0x3ff */ if(sizeof(long double) == 16) {