[Bug target/77918] S390: Floating point comparisons don't raise invalid for unordered operands.

[iii at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77918

--- Comment #9 from iii at gcc dot gnu.org ---
Author: iii
Date: Fri Oct 11 09:00:26 2019
New Revision: 276871

URL: https://gcc.gnu.org/viewcvs?rev=276871&root=gcc&view=rev
Log:
S/390: Use signaling FP comparison instructions

dg-torture.exp=inf-compare-1.c is failing, because (qNaN > +Inf)
comparison is compiled to CDB instruction, which does not signal an
invalid operation exception. KDB should have been used instead.

This patch introduces a new CCmode and a new pattern in order to
generate signaling instructions in this and similar cases.

gcc/ChangeLog:

2019-10-11  Ilya Leoshkevich  <iii@linux.ibm.com>

        PR target/77918
        * config/s390/2827.md: Add new opcodes.
        * config/s390/2964.md: Likewise.
        * config/s390/3906.md: Likewise.
        * config/s390/8561.md: Likewise.
        * config/s390/s390-builtins.def (s390_vfchesb): Use
        the new vec_cmpgev4sf_quiet_nocc.
        (s390_vfchedb): Use the new vec_cmpgev2df_quiet_nocc.
        (s390_vfchsb): Use the new vec_cmpgtv4sf_quiet_nocc.
        (s390_vfchdb): Use the new vec_cmpgtv2df_quiet_nocc.
        (vec_cmplev4sf): Use the new vec_cmplev4sf_quiet_nocc.
        (vec_cmplev2df): Use the new vec_cmplev2df_quiet_nocc.
        (vec_cmpltv4sf): Use the new vec_cmpltv4sf_quiet_nocc.
        (vec_cmpltv2df): Use the new vec_cmpltv2df_quiet_nocc.
        * config/s390/s390-modes.def (CCSFPS): New mode.
        * config/s390/s390.c (s390_match_ccmode_set): Support CCSFPS.
        (s390_select_ccmode): Return CCSFPS for LT, LE, GT, GE and LTGT.
        (s390_branch_condition_mask): Reuse CCS for CCSFPS.
        (s390_expand_vec_compare): Use non-signaling patterns where
        necessary.
        (s390_reverse_condition): Support CCSFPS.
        * config/s390/s390.md (*cmp<mode>_ccsfps): New pattern.
        * config/s390/vector.md: (VFCMP_HW_OP): Remove.
        (asm_fcmp_op): Likewise.
        (*smaxv2df3_vx): Use pattern for quiet comparison.
        (*sminv2df3_vx): Likewise.
        (*vec_cmp<VFCMP_HW_OP:code><mode>_nocc): Remove.
        (*vec_cmpeq<mode>_quiet_nocc): New pattern.
        (vec_cmpgt<mode>_quiet_nocc): Likewise.
        (vec_cmplt<mode>_quiet_nocc): New expander.
        (vec_cmpge<mode>_quiet_nocc): New pattern.
        (vec_cmple<mode>_quiet_nocc): New expander.
        (*vec_cmpeq<mode>_signaling_nocc): New pattern.
        (*vec_cmpgt<mode>_signaling_nocc): Likewise.
        (*vec_cmpgt<mode>_signaling_finite_nocc): Likewise.
        (*vec_cmpge<mode>_signaling_nocc): Likewise.
        (*vec_cmpge<mode>_signaling_finite_nocc): Likewise.
        (vec_cmpungt<mode>): New expander.
        (vec_cmpunge<mode>): Likewise.
        (vec_cmpuneq<mode>): Use quiet patterns.
        (vec_cmpltgt<mode>): Allow only on z14+.
        (vec_cmpordered<mode>): Use quiet patterns.
        (vec_cmpunordered<mode>): Likewise.
        (VEC_CMP_EXPAND): Add ungt and unge.

gcc/testsuite/ChangeLog:

2019-10-11  Ilya Leoshkevich  <iii@linux.ibm.com>

        * gcc.target/s390/vector/vec-scalar-cmp-1.c: Adjust
        expectations.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/s390/2827.md
    trunk/gcc/config/s390/2964.md
    trunk/gcc/config/s390/3906.md
    trunk/gcc/config/s390/8561.md
    trunk/gcc/config/s390/s390-builtins.def
    trunk/gcc/config/s390/s390-modes.def
    trunk/gcc/config/s390/s390.c
    trunk/gcc/config/s390/s390.md
    trunk/gcc/config/s390/vector.md
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.target/s390/vector/vec-scalar-cmp-1.c