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We do not currently generate hardware conversion instructions when converting from _Decimal128 to _Decimal32. There is no one instruction that does the conversion, so we currently call the __dpd_trunctdsd2 lib function to do the conversion for us. However, there is a short sequence of dfp hardware instructions that will do the conversion correctly. 2020-07-17 Peter Bergner <bergner@linux.ibm.com> gcc/ PR target/92488 * config/rs6000/dfp.md (trunctdsd2): New define_insn. * config/rs6000/rs6000.md (define_attr "isa"): Add p9. (define_attr "enabled"): Handle p9. gcc/testsuite/ PR target/92488 * gcc.target/powerpc/convert-fp-128.c (bl, drsp, drdpq): Update counts. (__dpd_trunctdsd2): Make conditional on !hard_dfp. (__dpd_extendsddd2, __dpd_extendsdtd2, __dpd_truncddsd2, __dpd_extendddtd2, __dpd_trunctddd2): Use !hard_dfp. * gcc.target/powerpc/pr92488.c: New test.
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