WhyCan Forum(哇酷开发者社区)

Thread model: single
Supported LTO compression algorithms: zlib zstd
gcc version 10.2.0 (Xuantie-900 elf newlib gcc Toolchain V2.2.4 B-20211227)

There is a guy at rivai.ai who claims to be working on gcc rvv 1.0 support for mainline FSF gcc, so maybe in a few months we will have something usable. Rivai is in Shenzhen.

   DEVICE  = ' -march=rv64gcvxtheadc  -mabi=lp64d -mtune=c906 -fno-omit-frame-pointer '
   CFLAGS  = DEVICE + '  -ffreestanding -fno-common -ffunction-sections -fdata-sections -fstrict-volatile-bitfields '

Stack
                   .
                   .
      +->          .
      |   +-----------------+   |
      |   | return address  |   |
      |   |   previous fp ------+
      |   | saved registers |
      |   | local variables |
      |   |       ...       | <-+
      |   +-----------------+   |
      |   | return address  |   |
      +------ previous fp   |   |
          | saved registers |   |
          | local variables |   |
      +-> |       ...       |   |
      |   +-----------------+   |
      |   | return address  |   |
      |   |   previous fp ------+
      |   | saved registers |
      |   | local variables |
      |   |       ...       | <-+
      |   +-----------------+   |
      |   | return address  |   |
      +------ previous fp   |   |
          | saved registers |   |
          | local variables |   |
  $fp --> |       ...       |   |
          +-----------------+   |
          | return address  |   |
          |   previous fp ------+
          | saved registers |
  $sp --> | local variables |
          +-----------------+

unsigned long test_addsl(unsigned long b,unsigned long c)
{
  unsigned long a;
  a = b + (c << 2);
  return a;
}

00000000400000f0 <test_addsl>:
    400000f0:	1141                	addi	sp,sp,-16
    400000f2:	e422                	sd	s0,8(sp)
    400000f4:	0800                	addi	s0,sp,16
    400000f6:	6422                	ld	s0,8(sp)
    400000f8:	04b5150b          	addsl	a0,a0,a1,2
    400000fc:	0141                	addi	sp,sp,16
    400000fe:	8082                	ret
	...

00000000400000d0 <test_addsl>:
    400000d0:	04b5150b          	addsl	a0,a0,a1,2
    400000d4:	8082                	ret
	...

#include <riscv-vector.h>

vuint8m8_t test_auto_vand(vuint8m8_t a, vuint8m8_t b) 
{
    return a & b;
}

int main(void)
{
    vuint8m8_t aa = {0};
    vuint8m8_t bb = {0};
    test_auto_vand(aa,bb);
}

-march=rv64gcvxtheadc -mabi=lp64d -mtune=c906

https://github.com/T-head-Semi/csi-nn2

                /*__s32	uart_port;*/
		0,
		/*normal_gpio_cfg   uart_ctrl[2];*/
		{
		{6, 2, 4, 1, 1, 0, {0} },/*PB8: 4--RX*/
		{6, 4, 4, 1, 1, 0, {0} },/*PB9: 4--TX*/
		},

                /*__s32	uart_port;*/
		0,
		/*normal_gpio_cfg   uart_ctrl[2];*/
		{
                {2, 8, 6, 1, 1, 0, {0} },/*PB8: 4--RX*/
		{2, 9, 6, 1, 1, 0, {0} },/*PB9: 4--TX*/
		},

xfel.exe write 0x20000 boot0_sdcard_sun20iw1p1.bin 
100% [================================================]    66 kB,  319.7 kB/s

xfel.exe exec 0x20000