gcc.target/arc/uncached-7.c fails

[abrodkin]

The following DejaGnu test (https://github.com/foss-for-synopsys-dwc-arc-processors/gcc/blob/arc-2020.09/gcc/testsuite/gcc.target/arc/uncached-7.c) of GCC fails with arc-2020.09 toolchain this way:

FAIL: gcc.target/arc/uncached-7.c scan-assembler-times st.di 1

$ arc-elf32-gcc -v
...
gcc version 10.2.0 (ARCompact/ARCv2 ISA elf32 toolchain 2020.09)

$ arc-elf32-gcc uncached-7.c -O1 -S -mcpu=archs
$ cat uncached-7.s
        .file   "uncached-7.c"
        .cpu HS
        .arc_attribute Tag_ARC_PCS_config, 2
        .arc_attribute Tag_ARC_ABI_rf16, 0
        .arc_attribute Tag_ARC_ABI_pic, 0
        .arc_attribute Tag_ARC_ABI_tls, 0
        .arc_attribute Tag_ARC_ABI_sda, 2
        .arc_attribute Tag_ARC_ABI_exceptions, 0
        .arc_attribute Tag_ARC_CPU_variation, 2
        .section        .text
        .align 4
        .global s_acc
        .type   s_acc, @function
s_acc:
        st      15,[@s+40]      ;37
        j_s     [blink]
        .size   s_acc, .-s_acc
        .global s
        .section        .bss
        .align 4
        .type   s, @object
        .size   s, 80
s:
        .zero   80
        .ident  "GCC: (ARCompact/ARCv2 ISA elf32 toolchain 2020.09) 10.2.0"
        .section        .note.GNU-stack,"",@progbits

With arc-2020.03 it passes:

$ arc-elf32-gcc -v
...
gcc version 9.3.1 20200315 (ARCompact/ARCv2 ISA elf32 toolchain 2020.03)

$ arc-elf32-gcc uncached-7.c -O1 -S -mcpu=archs
$ cat uncached-7.s
        .file   "uncached-7.c"
        .cpu HS
        .arc_attribute Tag_ARC_PCS_config, 2
        .arc_attribute Tag_ARC_ABI_rf16, 0
        .arc_attribute Tag_ARC_ABI_pic, 0
        .arc_attribute Tag_ARC_ABI_tls, 0
        .arc_attribute Tag_ARC_ABI_sda, 2
        .arc_attribute Tag_ARC_ABI_exceptions, 0
        .arc_attribute Tag_ARC_CPU_variation, 2
        .section        .text
        .align 4
        .global s_acc
        .type   s_acc, @function
s_acc:
        st.di   15,[@s+40]
        j_s     [blink]
        .size   s_acc, .-s_acc
        .global s
        .section        .bss
        .align 4
        .type   s, @object
        .size   s, 80
s:
        .zero   80
        .ident  "GCC: (ARCompact/ARCv2 ISA elf32 toolchain 2020.03) 9.3.1 20200315"
        .section        .note.GNU-stack,"",@progbits

[claziss]

This require a proper implementationof unchahed attribute.

[VVIsaev]

https://lists.zephyrproject.org/g/users/message/2904 -- same issue from zephyr mailing list.