[Bug target/91229] RISC-V ABI problem with zero-length bit-fields and float struct fields

[wilson at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91229

--- Comment #3 from Jim Wilson <wilson at gcc dot gnu.org> ---
Author: wilson
Date: Thu Aug  8 19:04:56 2019
New Revision: 274215

URL: https://gcc.gnu.org/viewcvs?rev=274215&root=gcc&view=rev
Log:
RISC-V: Fix C ABI for flattened struct with 0-length bitfield.

        gcc/
        PR target/91229
        * config/riscv/riscv.c (riscv_flatten_aggregate_field): New arg
        ignore_zero_width_bit_field_p.  Skip zero size bitfields when true.
        Pass into recursive call.
        (riscv_flatten_aggregate_argument): New arg.  Pass to
        riscv_flatten_aggregate_field.
        (riscv_pass_aggregate_in_fpr_pair_p): New local warned.  Call
        riscv_flatten_aggregate_argument twice, with false and true as last
        arg.  Process result twice.  Compare results and warn if different.
        (riscv_pass_aggregate_in_fpr_and_gpr_p): Likewise.

        gcc/testsuite/
        * gcc.target/riscv/flattened-struct-abi-1.c: New test.
        * gcc.target/riscv/flattened-struct-abi-2.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/riscv/flattened-struct-abi-1.c
    trunk/gcc/testsuite/gcc.target/riscv/flattened-struct-abi-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/riscv/riscv.c
    trunk/gcc/testsuite/ChangeLog