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Hi!
I'm currently fixing some minor portability issues in gccrs and stumbled over
the following
error [1] which indicates a reference to an ARMv8 target extension in the ARM
backend which
doesn't seem to exist:
../../gcc/config/arm/arm-rust.c:204:9: error: 'arm_arch8_5' was not declared in
this scope; did you mean 'arm_arch8_4'?
204 | if (arm_arch8_5)
| ^~~~~~~~~~~
| arm_arch8_4
../../gcc/config/arm/arm-rust.c:206:9: error: 'arm_arch8_6' was not declared in
this scope; did you mean 'arm_arch8_4'?
206 | if (arm_arch8_6)
| ^~~~~~~~~~~
| arm_arch8_4
Looking at gcc/config/arm.c, the highest level of ARMv8 that is supported in
the ARM backend is 8.4,
not 8.5 and 8.6 [2]:
/* Nonzero if this chip supports the ARM Architecture 8.2 extensions. */
int arm_arch8_2 = 0;
/* Nonzero if this chip supports the ARM Architecture 8.3 extensions. */
int arm_arch8_3 = 0;
/* Nonzero if this chip supports the ARM Architecture 8.4 extensions. */
int arm_arch8_4 = 0;
/* Nonzero if this chip supports the ARM Architecture 8.1-M Mainline
extensions. */
int arm_arch8_1m_main = 0;
/* Nonzero if this chip supports the FP16 instructions extension of ARM
Architecture 8.2. */
int arm_fp16_inst = 0;
Does anyone know whether the ARM backend is supposed to support the ARMv8.5 and
ARMv8.6
baselines or are these only present in the Aarch64 backend? If the latter
applies, I can
just delete the two if statements in arm-rust.c.
Thanks,
Adrian
> [1] https://github.com/Rust-GCC/gccrs/issues/483
> [2] https://github.com/gcc-mirror/gcc/blob/master/gcc/config/arm/arm.c#L919
--
.''`. John Paul Adrian Glaubitz
: :' : Debian Developer - glaub...@debian.org
`. `' Freie Universitaet Berlin - glaub...@physik.fu-berlin.de
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