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vvp: Remove unused `%cmp/ws` and `%cmp/wu` instructions 

The `%cmp/ws` and `%cmp/wu` instructions compare two index registers. They
are currently unused. Since the index registers are not used for data there
is not really a need to compare them. Values can be compared before loading
them into an index register.

So remove these two instructions.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
This commit is contained in:
Lars-Peter Clausen 2022-05-22 12:54:32 +02:00
parent 781089662c
commit 86cc6e6159
3 changed files with 0 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
vvp/compile.cc
View File

@ -129,8 +129,6 @@ static const struct opcode_table_s opcode_table[] = {
{ "%cmp/we", of_CMPWE, 0, {OA_NONE, OA_NONE, OA_NONE} },
{ "%cmp/wne", of_CMPWNE, 0, {OA_NONE, OA_NONE, OA_NONE} },
{ "%cmp/wr", of_CMPWR, 0, {OA_NONE, OA_NONE, OA_NONE} },
{ "%cmp/ws", of_CMPWS, 2, {OA_BIT1, OA_BIT2, OA_NONE} },
{ "%cmp/wu", of_CMPWU, 2, {OA_BIT1, OA_BIT2, OA_NONE} },
{ "%cmp/x", of_CMPX, 0, {OA_NONE, OA_NONE, OA_NONE} },
{ "%cmp/z", of_CMPZ, 0, {OA_NONE, OA_NONE, OA_NONE} },
{ "%cmpi/e", of_CMPIE, 3, {OA_BIT1, OA_BIT2, OA_NUMBER} },

5
vvp/opcodes.txt
View File

@ -341,11 +341,6 @@ values from the real-value stack and writes the comparison result to
bits 4/5. The expressions (a < b) and (a==b) are calculated, with (b)
popped from the stack first, then (a).
* %cmp/ws <bit-l>, <bit-r>
* %cmp/wu <bit-l>, <bit-r>
[compare signed/unsigned integer words.]
* %cmp/z
* %cmp/x

28
vvp/vthread.cc
View File

@ -2245,34 +2245,6 @@ bool of_CMPWR(vthread_t thr, vvp_code_t)
return true;
}
bool of_CMPWS(vthread_t thr, vvp_code_t cp)
{
int64_t l = thr->words[cp->bit_idx[0]].w_int;
int64_t r = thr->words[cp->bit_idx[1]].w_int;
vvp_bit4_t eq = (l == r)? BIT4_1 : BIT4_0;
vvp_bit4_t lt = (l < r)? BIT4_1 : BIT4_0;
thr->flags[4] = eq;
thr->flags[5] = lt;
return true;
}
bool of_CMPWU(vthread_t thr, vvp_code_t cp)
{
uint64_t l = thr->words[cp->bit_idx[0]].w_uint;
uint64_t r = thr->words[cp->bit_idx[1]].w_uint;
vvp_bit4_t eq = (l == r)? BIT4_1 : BIT4_0;
vvp_bit4_t lt = (l < r)? BIT4_1 : BIT4_0;
thr->flags[4] = eq;
thr->flags[5] = lt;
return true;
}
/*
* %cmp/z
*/