[PATCH] [ARC] Pass along -mcode-density flag to the assembler
Claudiu Zissulescu
Claudiu.Zissulescu@synopsys.com
Thu Sep 5 07:49:00 GMT 2019
It looks good. I'll merge it asap.
Thank you for your contribution,
Claudiu
> -----Original Message-----
> From: Shahab Vahedi [mailto:shahab.vahedi@gmail.com]
> Sent: Tuesday, September 03, 2019 7:14 PM
> To: Claudiu Zissulescu <claziss@synopsys.com>
> Cc: Shahab Vahedi <shahab@synopsys.com>; gcc-patches@gcc.gnu.org;
> Francois Bedard <fbedard@synopsys.com>
> Subject: [PATCH] [ARC] Pass along -mcode-density flag to the assembler
>
> From: Shahab Vahedi <shahab@synopsys.com>
>
> This change makes sure that if the driver is invoked with
> "-mcode-density" flag, then the assembler will receive it
> too.
>
> gcc/
> 2019-09-03 Sahahb Vahedi <shahab@synopsys.com>
>
> * config/arc/arc.h (ASM_SPEC): pass -mcode-density
> * gcc.target/arc/code-density-flag.c: New test.
>
> Signed-off-by: Shahab Vahedi <shahab@synopsys.com>
> ---
> gcc/config/arc/arc.h | 5 +--
> .../gcc.target/arc/code-density-flag.c | 34 +++++++++++++++++++
> 2 files changed, 37 insertions(+), 2 deletions(-)
> create mode 100644 gcc/testsuite/gcc.target/arc/code-density-flag.c
>
> diff --git a/gcc/config/arc/arc.h b/gcc/config/arc/arc.h
> index 8dca0d2c4b2..05fba539295 100644
> --- a/gcc/config/arc/arc.h
> +++ b/gcc/config/arc/arc.h
> @@ -96,8 +96,9 @@ extern const char *arc_cpu_to_as (int argc, const char
> **argv);
> #endif
>
> #undef ASM_SPEC
> -#define ASM_SPEC "%{mbig-endian|EB:-EB} %{EL} " \
> - "%:cpu_to_as(%{mcpu=*:%*}) %{mspfp*} %{mdpfp*} %{mfpu=fpuda*:-
> mfpuda}"
> +#define ASM_SPEC "%{mbig-endian|EB:-EB} %{EL} " \
> + "%:cpu_to_as(%{mcpu=*:%*}) %{mspfp*} %{mdpfp*} " \
> + "%{mfpu=fpuda*:-mfpuda} %{mcode-density}"
>
> #define OPTION_DEFAULT_SPECS
> \
> {"cpu", "%{!mcpu=*:%{!mARC*:%{!marc*:%{!mA7:%{!mA6:-
> mcpu=%(VALUE)}}}}}" }
> diff --git a/gcc/testsuite/gcc.target/arc/code-density-flag.c
> b/gcc/testsuite/gcc.target/arc/code-density-flag.c
> new file mode 100644
> index 00000000000..1ecf1a2ca29
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/arc/code-density-flag.c
> @@ -0,0 +1,34 @@
> +/* Produce code-dense instructions and the assembler must *
> + * be okay with it. An example would be: *
> + * *
> + * sub_s r3, r1, r3 *
> + * *
> + * While generally for _short instructions_ , it is not *
> + * allowed to have different registers as the first and *
> + * second operands, the code-dense mode allows it. *
> + * This test is about the fact that if "-mcode-density" is *
> + * passed to gcc driver as the flag, "as" must receive it *
> + * as well, else it is going to choke on such encodings. */
> +
> +/* { dg-do assemble } */
> +/* { dg-skip-if "" { ! { clmcpu } } } */
> +/* { dg-options "-mcpu=em_mini -mcode-density" } */
> +
> +typedef long long uint64_t;
> +
> +uint64_t f1(void)
> +{
> + return 1;
> +}
> +
> +void f2(void)
> +{
> + uint64_t start_us = 0;
> + while ((f1() - start_us) < 2);
> +}
> +
> +/* This is a tricky check, because it hardcodes register *
> + * numbers. Nevertheless, it is easier than coming up with *
> + * a regular expression that the first two operands should *
> + * not be the same. */
> +/* { dg-final { scan-assembler "sub_s\\s+r3,r1,r3" } } */
> --
> 2.23.0
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