target/riscv: fix dead assignment

Scan-build reports:
	Unused code: Dead nested assignment
	riscv.c:459 Although the value stored to 'ir_user4_raw' is
		used in the enclosing expression, the value is
		never actually read from 'ir_user4_raw'

This is caused by the value reassigned in 'ir_user4_raw':
	riscv.c:459 ir_user4[3] = (uint8_t)(ir_user4_raw >>= 8);
but never used.

Drop the DIY conversion in favor of h_u32_to_le() that does not
reassign the input value.

Change-Id: Ifad29f4c46d4a2d0a2f5a5c4104d768cc3db2794
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7208
Reviewed-by: Tim Newsome <tim@sifive.com>
Reviewed-by: Jan Matyas <matyas@codasip.com>
Tested-by: jenkins

diff --git a/src/target/riscv/riscv.c b/src/target/riscv/riscv.c
index c25efcde9a0d8cfbfe3004633dbfdc8be627de58..5444fca01b84696afb5ab2d9dfc33f4a50aa734b 100644 (file)
--- a/src/target/riscv/riscv.c
+++ b/src/target/riscv/riscv.c
@@ -453,10 +453,7 @@ static int riscv_init_target(struct command_context *cmd_ctx,
        if (bscan_tunnel_ir_width != 0) {
                assert(target->tap->ir_length >= 6);
                uint32_t ir_user4_raw = 0x23 << (target->tap->ir_length - 6);
-               ir_user4[0] = (uint8_t)ir_user4_raw;
-               ir_user4[1] = (uint8_t)(ir_user4_raw >>= 8);
-               ir_user4[2] = (uint8_t)(ir_user4_raw >>= 8);
-               ir_user4[3] = (uint8_t)(ir_user4_raw >>= 8);
+               h_u32_to_le(ir_user4, ir_user4_raw);
                select_user4.num_bits = target->tap->ir_length;
                bscan_tunneled_ir_width[0] = bscan_tunnel_ir_width;
                if (bscan_tunnel_type == BSCAN_TUNNEL_DATA_REGISTER)