Add support for probing RISC-V vector extension availability in
the backend. This information will be used when deciding whether
to use vector instructions in code generation.
Cache lg2(vlenb) for the backend. The storing of lg2(vlenb) means
we can convert all of the division into subtraction.
While the compiler doesn't support RISCV_HWPROBE_EXT_ZVE64X,
we use RISCV_HWPROBE_IMA_V instead. RISCV_HWPROBE_IMA_V is more
strictly constrainted than RISCV_HWPROBE_EXT_ZVE64X. At least in
current QEMU implemenation, the V vector extension depends on the
zve64d extension.
Signed-off-by: TANG Tiancheng <tangtiancheng.ttc@alibaba-inc.com>
Reviewed-by: Liu Zhiwei <zhiwei_liu@linux.alibaba.com>
Tested-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-ID: <20241007025700.47259-2-zhiwei_liu@linux.alibaba.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
build fails on musl libc (alpine linux) with this error:
../util/cpuinfo-riscv.c: In function 'cpuinfo_init':
../util/cpuinfo-riscv.c:63:21: error: '__NR_riscv_hwprobe' undeclared (first use in this function); did you mean 'riscv_hwprobe'?
63 | if (syscall(__NR_riscv_hwprobe, &pair, 1, 0, NULL, 0) == 0
| ^~~~~~~~~~~~~~~~~~
| riscv_hwprobe
../util/cpuinfo-riscv.c:63:21: note: each undeclared identifier is reported only once for each function it appears in
ninja: subcommand failed
add '#include "asm/unistd.h"' to util/cpuinfo-riscv.c fixes build
Signed-off-by: Milan P. Stanić <mps@arvanta.net>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20240905150702.2484-1-mps@arvanta.net>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
With recent linux kernels, there is a syscall to probe for various
ISA extensions. These bits were phased in over several kernel
releases, so we still require checks for symbol availability.
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reported-by: Brad Smith <brad@comstyle.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Move detection code out of tcg, similar to other hosts.
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
