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Hexagon: fix HVX store new 

At 09a7e7db0f (Hexagon (target/hexagon) Remove uses of
op_regs_generated.h.inc, 2024-03-06), we've changed the logic of
check_new_value() to use the new pre-calculated
packet->insn[...].dest_idx instead of calculating the index on the fly
using opcode_reginfo[...]. The dest_idx index is calculated roughly like
the following:

    for reg in iset[tag]["syntax"]:
        if reg.is_written():
            dest_idx = regno
            break

Thus, we take the first register that is writtable. Before that,
however, we also used to follow an alphabetical order on the register
type: 'd', 'e', 'x', and 'y'. No longer following that makes us select
the wrong register index and the HVX store new instruction does not
update the memory like expected.

Signed-off-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Reviewed-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Message-Id: <f548dc1c240819c724245e887f29f918441e9125.1716220379.git.quic_mathbern@quicinc.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
This commit is contained in:
Matheus Tavares Bernardino 2024-05-20 12:53:04 -03:00 committed by Brian Cain
parent 3e246da2c3
commit a1852002c7
2 changed files with 29 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
target/hexagon/gen_trans_funcs.py
View File

@ -89,6 +89,7 @@ def gen_trans_funcs(f):
new_read_idx = -1
dest_idx = -1
dest_idx_reg_id = None
has_pred_dest = "false"
for regno, (reg_type, reg_id, *_) in enumerate(regs):
reg = hex_common.get_register(tag, reg_type, reg_id)
@ -97,9 +98,11 @@ def gen_trans_funcs(f):
"""))
if reg.is_read() and reg.is_new():
new_read_idx = regno
# dest_idx should be the first destination, so check for -1
if reg.is_written() and dest_idx == -1:
dest_idx = regno
if reg.is_written():
# dest_idx should be the first destination alphabetically
if dest_idx_reg_id is None or reg_id < dest_idx_reg_id:
dest_idx = regno
dest_idx_reg_id = reg_id
if reg_type == "P" and reg.is_written() and not reg.is_read():
has_pred_dest = "true"

23
tests/tcg/hexagon/hvx_misc.c
View File

@ -474,6 +474,27 @@ static void test_vcombine(void)
check_output_w(__LINE__, BUFSIZE);
}
void test_store_new()
{
asm volatile(
"r0 = #0x12345678\n"
"v0 = vsplat(r0)\n"
"r0 = #0xff00ff00\n"
"v1 = vsplat(r0)\n"
"{\n"
" vdeal(v1,v0,r0)\n"
" vmem(%0) = v0.new\n"
"}\n"
:
: "r"(&output[0])
: "r0", "v0", "v1", "memory"
);
for (int i = 0; i < MAX_VEC_SIZE_BYTES / 4; i++) {
expect[0].w[i] = 0x12345678;
}
check_output_w(__LINE__, 1);
}
int main()
{
init_buffers();
@ -515,6 +536,8 @@ int main()
test_vcombine();
test_store_new();
puts(err ? "FAIL" : "PASS");
return err ? 1 : 0;
}