SYS-OSS/FRET-qemu
4
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

target/riscv: Fix the element agnostic function problem

Browse Source 
In RVV and vcrypto instructions, the masked and tail elements are set to 1s
using vext_set_elems_1s function if the vma/vta bit is set. It is the element
agnostic policy.

However, this function can't deal the big endian situation. This patch fixes
the problem by adding handling of such case.

Signed-off-by: Huang Tao <eric.huang@linux.alibaba.com>
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Cc: qemu-stable <qemu-stable@nongnu.org>
Message-ID: <20240325021654.6594-1-eric.huang@linux.alibaba.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
(cherry picked from commit 75115d880c6d396f8a2d56aab8c12236d85a90e0)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Huang Tao 2024-03-25 10:16:54 +08:00 committed by Michael Tokarev
parent 2dcc48b38b
commit af1e2cdc57
1 changed files with 22 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
target/riscv/vector_internals.c
View File

@ -30,6 +30,28 @@ void vext_set_elems_1s(void *base, uint32_t is_agnostic, uint32_t cnt,
if (tot - cnt == 0) {
return ;
}
if (HOST_BIG_ENDIAN) {
/*
* Deal the situation when the elements are insdie
* only one uint64 block including setting the
* masked-off element.
*/
if (((tot - 1) ^ cnt) < 8) {
memset(base + H1(tot - 1), -1, tot - cnt);
return;
}
/*
* Otherwise, at least cross two uint64_t blocks.
* Set first unaligned block.
*/
if (cnt % 8 != 0) {
uint32_t j = ROUND_UP(cnt, 8);
memset(base + H1(j - 1), -1, j - cnt);
cnt = j;
}
/* Set other 64bit aligend blocks */
}
memset(base + cnt, -1, tot - cnt);
}