Hi, on S/390 we have DFP conversions for SD<->DD and DD<->TD but miss SD<->TD. The attached patch expands the missing patterns to SD->DD->TD and TD->DD->SD to avoid library calls being emitted.
No regressions on s390 and s390x. Bye, -Andreas- 2014-09-10 Andreas Krebbel <andreas.kreb...@de.ibm.com> * config/s390/s390.md ("trunctdsd2", "extendsdtd2"): New expanders. 2014-09-10 Andreas Krebbel <andreas.kreb...@de.ibm.com> * gcc.target/s390/dfp-conv1.c: New testcase. diff --git a/gcc/config/s390/s390.md b/gcc/config/s390/s390.md index bcfe8f9..73ac0dc 100644 --- a/gcc/config/s390/s390.md +++ b/gcc/config/s390/s390.md @@ -4406,6 +4406,18 @@ [(set_attr "op_type" "RRF") (set_attr "type" "ftruncsd")]) +(define_expand "trunctdsd2" + [(parallel + [(set (match_dup 3) + (float_truncate:DD (match_operand:TD 1 "register_operand" ""))) + (clobber (match_scratch:TD 2 ""))]) + (set (match_operand:SD 0 "register_operand" "") + (float_truncate:SD (match_dup 3)))] + "TARGET_HARD_DFP" +{ + operands[3] = gen_reg_rtx (DDmode); +}) + ; ; extend(sf|df)(df|tf)2 instruction pattern(s). ; @@ -4442,6 +4454,16 @@ [(set_attr "op_type" "RRF") (set_attr "type" "fsimptf")]) +(define_expand "extendsdtd2" + [(set (match_dup 2) + (float_extend:DD (match_operand:SD 1 "register_operand" ""))) + (set (match_operand:TD 0 "register_operand" "") + (float_extend:TD (match_dup 2)))] + "TARGET_HARD_DFP" +{ + operands[2] = gen_reg_rtx (DDmode); +}) + ; Binary Floating Point - load fp integer ; Expanders for: floor, btrunc, round, ceil, and nearbyint diff --git a/gcc/testsuite/gcc.target/s390/dfp-conv1.c b/gcc/testsuite/gcc.target/s390/dfp-conv1.c new file mode 100644 index 0000000..3c553a3 --- /dev/null +++ b/gcc/testsuite/gcc.target/s390/dfp-conv1.c @@ -0,0 +1,22 @@ +/* We do not have hardware instructions which do a direct conversion + between the 32 and 128 bit DFP types. But we can easily do it in + two steps. Older libdfp implementations require this not to call + into a lib in order to prevent an endless loop. */ + +/* { dg-do compile } */ +/* { dg-options "-O3 -march=z10 -mzarch" } */ + +_Decimal32 +foo (_Decimal128 a) +{ + return (_Decimal32)a; +} + +_Decimal128 +bar (_Decimal32 a) +{ + return (_Decimal128)a; +} + +/* Make sure no library call is emitted. */ +/* { dg-final { scan-assembler-not "brasl" } } */ -- 1.7.11.4