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Currently for 128 bit floating-point ibm128 and ieee128 formats conversion, the corresponding libcalls are: ibm128 -> ieee128 "__trunctfkf2" ieee128 -> ibm128 "__extendkftf2" , and generic code handling (like convert_mode_scalar) also adopts sext_optab for ieee128 -> ibm128 while trunc_optab for ibm128 -> ieee128. But in rs6000 port as function rs6000_expand_float128_convert and init_float128_ieee show, we adopt sext_optab for ibm128 -> ieee128 with "__trunctfkf2" while trunc_optab for ieee128 -> ibm128 with "__extendkftf2". To make them consistent and avoid some surprises, this patch is to adjust rs6000 internal handlings by adopting trunc_optab for ibm128 -> ieee128 with "__trunctfkf2" while sext_optab for ieee128 -> ibm128 with "__extendkftf2". gcc/ChangeLog: * config/rs6000/rs6000.cc (init_float128_ieee): Use trunc_optab rather than sext_optab for converting FLOAT128_IBM_P mode to FLOAT128_IEEE_P mode, and use sext_optab rather than trunc_optab for converting FLOAT128_IEEE_P mode to FLOAT128_IBM_P mode. (rs6000_expand_float128_convert): Likewise.
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