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Initial import of Pawn (Small 3.0)
2005-07-24 20:00:55 +00:00
/* Pawn compiler - Peephole optimizer "sequences" strings (plain
* and compressed formats)
*
* Copyright (c) ITB CompuPhase, 2000-2005
*
* This software is provided "as-is", without any express or implied warranty.
* In no event will the authors be held liable for any damages arising from
* the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software in
* a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#define SCPACK_TERMINATOR , /* end each section with a comma */
#define SCPACK_TABLE sequences_table
#define seqsize(o,p) (opcodes(o)+opargs(p))
typedef struct {
Remove scpack
2015-03-10 17:56:35 +00:00
const char *find;
const char *replace;
Initial import of Pawn (Small 3.0)
2005-07-24 20:00:55 +00:00
int savesize; /* number of bytes saved (in bytecode) */
} SEQUENCE;
static SEQUENCE sequences_cmp[] = {
/* A very common sequence in four varieties
* load.s.pri n1 load.s.pri n2
* push.pri load.s.alt n1
* load.s.pri n2 -
* pop.alt -
* --------------------------------------
* load.pri n1 load.s.pri n2
* push.pri load.alt n1
* load.s.pri n2 -
* pop.alt -
* --------------------------------------
* load.s.pri n1 load.pri n2
* push.pri load.s.alt n1
* load.pri n2 -
* pop.alt -
* --------------------------------------
* load.pri n1 load.pri n2
* push.pri load.alt n1
* load.pri n2 -
* pop.alt -
*/
{
"load.s.pri %1!push.pri!load.s.pri %2!pop.alt!",
"load.s.pri %2!load.s.alt %1!",
seqsize(4,2) - seqsize(2,2)
},
{
"load.pri %1!push.pri!load.s.pri %2!pop.alt!",
"load.s.pri %2!load.alt %1!",
seqsize(4,2) - seqsize(2,2)
},
{
"load.s.pri %1!push.pri!load.pri %2!pop.alt!",
"load.pri %2!load.s.alt %1!",
seqsize(4,2) - seqsize(2,2)
},
{
"load.pri %1!push.pri!load.pri %2!pop.alt!",
"load.pri %2!load.alt %1!",
seqsize(4,2) - seqsize(2,2)
},
/* (#1#) The above also occurs with "addr.pri" (array
* indexing) as the first line; so that adds 2 cases.
*/
{
"addr.pri %1!push.pri!load.s.pri %2!pop.alt!",
"addr.alt %1!load.s.pri %2!",
seqsize(4,2) - seqsize(2,2)
},
{
"addr.pri %1!push.pri!load.pri %2!pop.alt!",
"addr.alt %1!load.pri %2!",
seqsize(4,2) - seqsize(2,2)
},
/* And the same sequence with const.pri as either the first
* or the second load instruction: four more cases.
*/
{
"const.pri %1!push.pri!load.s.pri %2!pop.alt!",
"load.s.pri %2!const.alt %1!",
seqsize(4,2) - seqsize(2,2)
},
{
"const.pri %1!push.pri!load.pri %2!pop.alt!",
"load.pri %2!const.alt %1!",
seqsize(4,2) - seqsize(2,2)
},
{
"load.s.pri %1!push.pri!const.pri %2!pop.alt!",
"const.pri %2!load.s.alt %1!",
seqsize(4,2) - seqsize(2,2)
},
{
"load.pri %1!push.pri!const.pri %2!pop.alt!",
"const.pri %2!load.alt %1!",
seqsize(4,2) - seqsize(2,2)
},
/* The same as above, but now with "addr.pri" (array
* indexing) on the first line and const.pri on
* the second.
*/
{
"addr.pri %1!push.pri!const.pri %2!pop.alt!",
"addr.alt %1!const.pri %2!",
seqsize(4,2) - seqsize(2,2)
},
{
"addr.pri %1!push.pri!zero.pri!pop.alt!",
"addr.alt %1!zero.pri!",
seqsize(4,1) - seqsize(2,1)
},
/* ??? add references */
/* Chained relational operators can contain sequences like:
* move.pri load.s.pri n1
* push.pri -
* load.s.pri n1 -
* pop.alt -
* The above also accurs for "load.pri" and for "const.pri",
* so add another two cases.
*/
{
"move.pri!push.pri!load.s.pri %1!pop.alt!",
"load.s.pri %1!",
seqsize(4,1) - seqsize(1,1)
},
{
"move.pri!push.pri!load.pri %1!pop.alt!",
"load.pri %1!",
seqsize(4,1) - seqsize(1,1)
},
{
"move.pri!push.pri!const.pri %1!pop.alt!",
"const.pri %1!",
seqsize(4,1) - seqsize(1,1)
},
/* More optimizations for chained relational operators; the
* continuation sequences can be simplified if they turn out
* to be termination sequences:
* xchg sless also for sless, sgeq and sleq
* sgrtr pop.alt
* swap.alt and
* and ;$exp
* pop.alt -
* ;$exp -
* --------------------------------------
* xchg sless also for sless, sgeq and sleq
* sgrtr pop.alt
* swap.alt and
* and jzer n1
* pop.alt -
* jzer n1 -
* --------------------------------------
* xchg jsgeq n1 also for sless, sgeq and sleq
* sgrtr ;$exp (occurs for non-chained comparisons)
* jzer n1 -
* ;$exp -
* --------------------------------------
* xchg sless also for sless, sgeq and sleq
* sgrtr ;$exp (occurs for non-chained comparisons)
* ;$exp -
*/
{
"xchg!sgrtr!swap.alt!and!pop.alt!;$exp!",
"sless!pop.alt!and!;$exp!",
seqsize(5,0) - seqsize(3,0)
},
{
"xchg!sless!swap.alt!and!pop.alt!;$exp!",
"sgrtr!pop.alt!and!;$exp!",
seqsize(5,0) - seqsize(3,0)
},
{
"xchg!sgeq!swap.alt!and!pop.alt!;$exp!",
"sleq!pop.alt!and!;$exp!",
seqsize(5,0) - seqsize(3,0)
},
{
"xchg!sleq!swap.alt!and!pop.alt!;$exp!",
"sgeq!pop.alt!and!;$exp!",
seqsize(5,0) - seqsize(3,0)
},
{
"xchg!sgrtr!swap.alt!and!pop.alt!jzer %1!",
"sless!pop.alt!and!jzer %1!",
seqsize(5,0) - seqsize(3,0)
},
{
"xchg!sless!swap.alt!and!pop.alt!jzer %1!",
"sgrtr!pop.alt!and!jzer %1!",
seqsize(5,0) - seqsize(3,0)
},
{
"xchg!sgeq!swap.alt!and!pop.alt!jzer %1!",
"sleq!pop.alt!and!jzer %1!",
seqsize(5,0) - seqsize(3,0)
},
{
"xchg!sleq!swap.alt!and!pop.alt!jzer %1!",
"sgeq!pop.alt!and!jzer %1!",
seqsize(5,0) - seqsize(3,0)
},
{
"xchg!sgrtr!jzer %1!;$exp!",
"jsgeq %1!;$exp!",
seqsize(3,1) - seqsize(1,1)
},
{
"xchg!sless!jzer %1!;$exp!",
"jsleq %1!;$exp!",
seqsize(3,1) - seqsize(1,1)
},
{
"xchg!sgeq!jzer %1!;$exp!",
"jsgrtr %1!;$exp!",
seqsize(3,1) - seqsize(1,1)
},
{
"xchg!sleq!jzer %1!;$exp!",
"jsless %1!;$exp!",
seqsize(3,1) - seqsize(1,1)
},
{
"xchg!sgrtr!;$exp!",
"sless!;$exp!",
seqsize(2,0) - seqsize(1,0)
},
{
"xchg!sless!;$exp!",
"sgrtr!;$exp!",
seqsize(2,0) - seqsize(1,0)
},
{
"xchg!sgeq!;$exp!",
"sleq!;$exp!",
seqsize(2,0) - seqsize(1,0)
},
{
"xchg!sleq!;$exp!",
"sgeq!;$exp!",
seqsize(2,0) - seqsize(1,0)
},
/* The entry to chained operators is also opt to optimization
* load.s.pri n1 load.s.pri n2
* load.s.alt n2 load.s.alt n1
* xchg -
* --------------------------------------
* load.s.pri n1 load.pri n2
* load.alt n2 load.s.alt n1
* xchg -
* --------------------------------------
* load.s.pri n1 const.pri n2
* const.alt n2 load.s.alt n1
* xchg -
* --------------------------------------
* and all permutations...
*/
{
"load.s.pri %1!load.s.alt %2!xchg!",
"load.s.pri %2!load.s.alt %1!",
seqsize(3,2) - seqsize(2,2)
},
{
"load.s.pri %1!load.alt %2!xchg!",
"load.pri %2!load.s.alt %1!",
seqsize(3,2) - seqsize(2,2)
},
{
"load.s.pri %1!const.alt %2!xchg!",
"const.pri %2!load.s.alt %1!",
seqsize(3,2) - seqsize(2,2)
},
{
"load.pri %1!load.s.alt %2!xchg!",
"load.s.pri %2!load.alt %1!",
seqsize(3,2) - seqsize(2,2)
},
{
"load.pri %1!load.alt %2!xchg!",
"load.pri %2!load.alt %1!",
seqsize(3,2) - seqsize(2,2)
},
{
"load.pri %1!const.alt %2!xchg!",
"const.pri %2!load.alt %1!",
seqsize(3,2) - seqsize(2,2)
},
{
"const.pri %1!load.s.alt %2!xchg!",
"load.s.pri %2!const.alt %1!",
seqsize(3,2) - seqsize(2,2)
},
{
"const.pri %1!load.alt %2!xchg!",
"load.pri %2!const.alt %1!",
seqsize(3,2) - seqsize(2,2)
},
/* Array indexing can merit from special instructions.
* Simple indexed array lookup can be optimized quite
* a bit.
* addr.pri n1 addr.alt n1
* push.pri load.s.pri n2
* load.s.pri n2 bounds n3
* bounds n3 lidx.b n4
* shl.c.pri n4 -
* pop.alt -
* add -
* load.i -
*
* And to prepare for storing a value in an array
* addr.pri n1 addr.alt n1
* push.pri load.s.pri n2
* load.s.pri n2 bounds n3
* bounds n3 idxaddr.b n4
* shl.c.pri n4 -
* pop.alt -
* add -
*
* Notes (additional cases):
* 1. instruction addr.pri can also be const.pri (for
* global arrays)
* 2. the bounds instruction can be absent
Remove scpack
2015-03-10 17:56:35 +00:00
* 3. when "n4" (the shift value) is the 2 (with 32-bit cells), use the
Initial import of Pawn (Small 3.0)
2005-07-24 20:00:55 +00:00
* even more optimal instructions LIDX and IDDXADDR
*
* If the array index is more complex, one can only optimize
* the last four instructions:
* shl.c.pri n1 pop.alt
* pop.alt lidx.b n1
* add -
* loadi -
* --------------------------------------
* shl.c.pri n1 pop.alt
* pop.alt idxaddr.b n1
* add -
*/
#if !defined BIT16
/* loading from array, "cell" shifted */
{
"addr.pri %1!push.pri!load.s.pri %2!bounds %3!shl.c.pri 2!pop.alt!add!load.i!",
"addr.alt %1!load.s.pri %2!bounds %3!lidx!",
seqsize(8,4) - seqsize(4,3)
},
{
"const.pri %1!push.pri!load.s.pri %2!bounds %3!shl.c.pri 2!pop.alt!add!load.i!",
"const.alt %1!load.s.pri %2!bounds %3!lidx!",
seqsize(8,4) - seqsize(4,3)
},
{
"addr.pri %1!push.pri!load.s.pri %2!shl.c.pri 2!pop.alt!add!load.i!",
"addr.alt %1!load.s.pri %2!lidx!",
seqsize(7,3) - seqsize(3,2)
},
{
"const.pri %1!push.pri!load.s.pri %2!shl.c.pri 2!pop.alt!add!load.i!",
"const.alt %1!load.s.pri %2!lidx!",
seqsize(7,3) - seqsize(3,2)
},
#endif
/* loading from array, not "cell" shifted */
{
"addr.pri %1!push.pri!load.s.pri %2!bounds %3!shl.c.pri %4!pop.alt!add!load.i!",
"addr.alt %1!load.s.pri %2!bounds %3!lidx.b %4!",
seqsize(8,4) - seqsize(4,4)
},
{
"const.pri %1!push.pri!load.s.pri %2!bounds %3!shl.c.pri %4!pop.alt!add!load.i!",
"const.alt %1!load.s.pri %2!bounds %3!lidx.b %4!",
seqsize(8,4) - seqsize(4,4)
},
{
"addr.pri %1!push.pri!load.s.pri %2!shl.c.pri %3!pop.alt!add!load.i!",
"addr.alt %1!load.s.pri %2!lidx.b %3!",
seqsize(7,3) - seqsize(3,3)
},
{
"const.pri %1!push.pri!load.s.pri %2!shl.c.pri %3!pop.alt!add!load.i!",
"const.alt %1!load.s.pri %2!lidx.b %3!",
seqsize(7,3) - seqsize(3,3)
},
#if !defined BIT16
/* array index calculation for storing a value, "cell" aligned */
{
"addr.pri %1!push.pri!load.s.pri %2!bounds %3!shl.c.pri 2!pop.alt!add!",
"addr.alt %1!load.s.pri %2!bounds %3!idxaddr!",
seqsize(7,4) - seqsize(4,3)
},
{
"const.pri %1!push.pri!load.s.pri %2!bounds %3!shl.c.pri 2!pop.alt!add!",
"const.alt %1!load.s.pri %2!bounds %3!idxaddr!",
seqsize(7,4) - seqsize(4,3)
},
{
"addr.pri %1!push.pri!load.s.pri %2!shl.c.pri 2!pop.alt!add!",
"addr.alt %1!load.s.pri %2!idxaddr!",
seqsize(6,3) - seqsize(3,2)
},
{
"const.pri %1!push.pri!load.s.pri %2!shl.c.pri 2!pop.alt!add!",
"const.alt %1!load.s.pri %2!idxaddr!",
seqsize(6,3) - seqsize(3,2)
},
#endif
/* array index calculation for storing a value, not "cell" packed */
{
"addr.pri %1!push.pri!load.s.pri %2!bounds %3!shl.c.pri %4!pop.alt!add!",
"addr.alt %1!load.s.pri %2!bounds %3!idxaddr.b %4!",
seqsize(7,4) - seqsize(4,4)
},
{
"const.pri %1!push.pri!load.s.pri %2!bounds %3!shl.c.pri %4!pop.alt!add!",
"const.alt %1!load.s.pri %2!bounds %3!idxaddr.b %4!",
seqsize(7,4) - seqsize(4,4)
},
{
"addr.pri %1!push.pri!load.s.pri %2!shl.c.pri %3!pop.alt!add!",
"addr.alt %1!load.s.pri %2!idxaddr.b %3!",
seqsize(6,3) - seqsize(3,3)
},
{
"const.pri %1!push.pri!load.s.pri %2!shl.c.pri %3!pop.alt!add!",
"const.alt %1!load.s.pri %2!idxaddr.b %3!",
seqsize(6,3) - seqsize(3,3)
},
#if !defined BIT16
/* the shorter array indexing sequences, see above for comments */
{
"shl.c.pri 2!pop.alt!add!loadi!",
"pop.alt!lidx!",
seqsize(4,1) - seqsize(2,0)
},
{
"shl.c.pri 2!pop.alt!add!",
"pop.alt!idxaddr!",
seqsize(3,1) - seqsize(2,0)
},
#endif
{
"shl.c.pri %1!pop.alt!add!loadi!",
"pop.alt!lidx.b %1!",
seqsize(4,1) - seqsize(2,1)
},
{
"shl.c.pri %1!pop.alt!add!",
"pop.alt!idxaddr.b %1!",
seqsize(3,1) - seqsize(2,1)
},
/* For packed arrays, there is another case (packed arrays
* do not take advantage of the LIDX or IDXADDR instructions).
* addr.pri n1 addr.alt n1
* push.pri load.s.pri n2
* load.s.pri n2 bounds n3
* bounds n3 -
* pop.alt -
*
* Notes (additional cases):
* 1. instruction addr.pri can also be const.pri (for
* global arrays)
* 2. the bounds instruction can be absent, but that
* case is already handled (see #1#)
*/
{
"addr.pri %1!push.pri!load.s.pri %2!bounds %3!pop.alt!",
"addr.alt %1!load.s.pri %2!bounds %3!",
seqsize(5,3) - seqsize(3,3)
},
{
"const.pri %1!push.pri!load.s.pri %2!bounds %3!pop.alt!",
"const.alt %1!load.s.pri %2!bounds %3!",
seqsize(5,3) - seqsize(3,3)
},
/* Declaration of simple variables often follows the sequence:
* ;$lcl <name> <stk> ;$lcl <name> <stk>
* stack -4 push.c <constval>
* const.pri <constval> ;$exp
* stor.s.pri <stk> -
* ;$exp -
*/
{
";$lcl %1 %2!stack -4!const.pri %3!stor.s.pri %2!;$exp!",
";$lcl %1 %2!push.c %3!;$exp!",
seqsize(3,3) - seqsize(1,1)
},
{
";$lcl %1 %2!stack -4!zero.pri!stor.s.pri %2!;$exp!",
";$lcl %1 %2!push.c 0!;$exp!",
seqsize(3,2) - seqsize(1,1)
},
/* During a calculation, the intermediate result must sometimes
* be moved from PRI to ALT, like in:
* push.pri move.alt
* load.s.pri n1 load.s.pri n1
* pop.alt -
*
* The above also accurs for "load.pri" and for "const.pri",
* so add another two cases.
*/
{
"push.pri!load.s.pri %1!pop.alt!",
"move.alt!load.s.pri %1!",
seqsize(3,1) - seqsize(2,1)
},
{
"push.pri!load.pri %1!pop.alt!",
"move.alt!load.pri %1!",
seqsize(3,1) - seqsize(2,1)
},
{
"push.pri!const.pri %1!pop.alt!",
"move.alt!const.pri %1!",
seqsize(3,1) - seqsize(2,1)
},
{
"push.pri!zero.pri!pop.alt!",
"move.alt!zero.pri!",
seqsize(3,0) - seqsize(2,0)
},
/* saving PRI and then loading from its address
* occurs when indexing a multi-dimensional array
*/
{
"push.pri!load.i!pop.alt!",
"move.alt!load.i!",
seqsize(3,0) - seqsize(2,0)
},
/* An even simpler PUSH/POP optimization (occurs in
* switch statements):
* push.pri move.alt
* pop.alt -
*/
{
"push.pri!pop.alt!",
"move.alt!",
seqsize(2,0) - seqsize(1,0)
},
/* And what to think of this PUSH/POP sequence, which occurs
* due to the support for user-defined assignment operator):
* push.alt -
* pop.alt -
*/
//???
//{
// "push.alt!pop.alt!",
// ";$", /* SCPACK cannot handle empty strings */
// seqsize(2,0) - seqsize(0,0)
//},
/* Functions with many parameters with the same default
* value have sequences like:
* push.c n1 const.pri n1
* ;$par push.r.pri n2 ; where n2 is the number of pushes
* push.c n1 ;$par
* ;$par -
* push.c n1 -
* ;$par -
* etc. etc.
* The shortest matched sequence is 3, because a sequence of two can also be
* optimized as two "push.c n1" instructions.
* => this optimization does not work, because the argument re-ordering in
* a function call causes each argument to be optimized individually
*/
//{
// "const.pri %1!push.pri!;$par!const.pri %1!push.pri!;$par!const.pri %1!push.pri!;$par!const.pri %1!push.pri!;$par!const.pri %1!push.pri!;$par!",
// "const.pri %1!push.r.pri 5!;$par!",
// seqsize(10,5) - seqsize(2,2)
//},
//{
// "const.pri %1!push.pri!;$par!const.pri %1!push.pri!;$par!const.pri %1!push.pri!;$par!const.pri %1!push.pri!;$par!",
// "const.pri %1!push.r.pri 4!;$par!",
// seqsize(8,4) - seqsize(2,2)
//},
//{
// "const.pri %1!push.pri!;$par!const.pri %1!push.pri!;$par!const.pri %1!push.pri!;$par!",
// "const.pri %1!push.r.pri 3!;$par!",
// seqsize(6,3) - seqsize(2,2)
//},
/* User-defined operators first load the operands into registers and
* then have them pushed onto the stack. This can give rise to sequences
* like:
* const.pri n1 push.c n1
* const.alt n2 push.c n2
* push.pri -
* push.alt -
* A similar sequence occurs with the two PUSH.pri/alt instructions inverted.
* The first, second, or both CONST.pri/alt instructions can also be
* LOAD.pri/alt.
* This gives 2 x 4 cases.
*/
{
"const.pri %1!const.alt %2!push.pri!push.alt!",
"push.c %1!push.c %2!",
seqsize(4,2) - seqsize(2,2)
},
{
"const.pri %1!const.alt %2!push.alt!push.pri!",
"push.c %2!push.c %1!",
seqsize(4,2) - seqsize(2,2)
},
{
"const.pri %1!load.alt %2!push.pri!push.alt!",
"push.c %1!push %2!",
seqsize(4,2) - seqsize(2,2)
},
{
"const.pri %1!load.alt %2!push.alt!push.pri!",
"push %2!push.c %1!",
seqsize(4,2) - seqsize(2,2)
},
{
"load.pri %1!const.alt %2!push.pri!push.alt!",
"push %1!push.c %2!",
seqsize(4,2) - seqsize(2,2)
},
{
"load.pri %1!const.alt %2!push.alt!push.pri!",
"push.c %2!push %1!",
seqsize(4,2) - seqsize(2,2)
},
{
"load.pri %1!load.alt %2!push.pri!push.alt!",
"push %1!push %2!",
seqsize(4,2) - seqsize(2,2)
},
{
"load.pri %1!load.alt %2!push.alt!push.pri!",
"push %2!push %1!",
seqsize(4,2) - seqsize(2,2)
},
/* Function calls (parameters are passed on the stack)
* load.s.pri n1 push.s n1
* push.pri -
* --------------------------------------
* load.pri n1 push n1
* push.pri -
* --------------------------------------
* const.pri n1 push.c n1
* push.pri -
* --------------------------------------
* zero.pri push.c 0
* push.pri -
* --------------------------------------
* addr.pri n1 pushaddr n1
* push.pri -
*
* However, PRI must not be needed after this instruction
* if this shortcut is used. Check for the ;$par comment.
*/
{
"load.s.pri %1!push.pri!;$par!",
"push.s %1!;$par!",
seqsize(2,1) - seqsize(1,1)
},
{
"load.pri %1!push.pri!;$par!",
"push %1!;$par!",
seqsize(2,1) - seqsize(1,1)
},
{
"const.pri %1!push.pri!;$par!",
"push.c %1!;$par!",
seqsize(2,1) - seqsize(1,1)
},
{
"zero.pri!push.pri!;$par!",
"push.c 0!;$par!",
seqsize(2,0) - seqsize(1,1)
},
{
"addr.pri %1!push.pri!;$par!",
"pushaddr %1!;$par!",
seqsize(2,1) - seqsize(1,1)
},
/* References with a default value generate new cells on the heap
* dynamically. That code often ends with:
* move.pri push.alt
* push.pri -
*/
{
"move.pri!push.pri!",
"push.alt!",
seqsize(2,0) - seqsize(1,0)
},
/* Simple arithmetic operations on constants. Noteworthy is the
* subtraction of a constant, since it is converted to the addition
* of the inverse value.
* const.alt n1 add.c n1
* add -
* --------------------------------------
* const.alt n1 add.c -n1
* sub -
* --------------------------------------
* const.alt n1 smul.c n1
* smul -
* --------------------------------------
* const.alt n1 eq.c.pri n1
* eq -
*/
{
"const.alt %1!add!",
"add.c %1!",
seqsize(2,1) - seqsize(1,1)
},
{
"const.alt %1!sub!",
"add.c -%1!",
seqsize(2,1) - seqsize(1,1)
},
{
"const.alt %1!smul!",
"smul.c %1!",
seqsize(2,1) - seqsize(1,1)
},
{
"const.alt %1!eq!",
"eq.c.pri %1!",
seqsize(2,1) - seqsize(1,1)
},
/* Some operations use the alternative subtraction operation --these
* can also be optimized.
* const.pri n1 load.s.pri n2
* load.s.alt n2 add.c -n1
* sub.alt -
* --------------------------------------
* const.pri n1 load.pri n2
* load.alt n2 add.c -n1
* sub.alt -
*/
{
"const.pri %1!load.s.alt %2!sub.alt!",
"load.s.pri %2!add.c -%1!",
seqsize(3,2) - seqsize(2,2)
},
{
"const.pri %1!load.alt %2!sub.alt!",
"load.pri %2!add.c -%1!",
seqsize(3,2) - seqsize(2,2)
},
/* With arrays indexed with constants that come from enumerations, it happens
* multiple add.c opcodes follow in sequence.
* add.c n1 add.c n1+n2
* add.c n2 -
*/
{
"add.c %1!add.c %2!",
"add.c %1+%2!",
seqsize(2,2) - seqsize(1,1)
},
/* Compare and jump
* eq jneq n1
* jzer n1 -
* --------------------------------------
* eq jeq n1
* jnz n1 -
* --------------------------------------
* neq jeq n1
* jzer n1 -
* --------------------------------------
* neq jneq n1
* jnz n1 -
* Compares followed by jzer occur much more
* often than compares followed with jnz. So we
* take the easy route here.
* less jgeq n1
* jzer n1 -
* --------------------------------------
* leq jgrtr n1
* jzer n1 -
* --------------------------------------
* grtr jleq n1
* jzer n1 -
* --------------------------------------
* geq jless n1
* jzer n1 -
* --------------------------------------
* sless jsgeq n1
* jzer n1 -
* --------------------------------------
* sleq jsgrtr n1
* jzer n1 -
* --------------------------------------
* sgrtr jsleq n1
* jzer n1 -
* --------------------------------------
* sgeq jsless n1
* jzer n1 -
*/
{
"eq!jzer %1!",
"jneq %1!",
seqsize(2,1) - seqsize(1,1)
},
{
"eq!jnz %1!",
"jeq %1!",
seqsize(2,1) - seqsize(1,1)
},
{
"neq!jzer %1!",
"jeq %1!",
seqsize(2,1) - seqsize(1,1)
},
{
"neq!jnz %1!",
"jneq %1!",
seqsize(2,1) - seqsize(1,1)
},
{
"less!jzer %1!",
"jgeq %1!",
seqsize(2,1) - seqsize(1,1)
},
{
"leq!jzer %1!",
"jgrtr %1!",
seqsize(2,1) - seqsize(1,1)
},
{
"grtr!jzer %1!",
"jleq %1!",
seqsize(2,1) - seqsize(1,1)
},
{
"geq!jzer %1!",
"jless %1!",
seqsize(2,1) - seqsize(1,1)
},
{
"sless!jzer %1!",
"jsgeq %1!",
seqsize(2,1) - seqsize(1,1)
},
{
"sleq!jzer %1!",
"jsgrtr %1!",
seqsize(2,1) - seqsize(1,1)
},
{
"sgrtr!jzer %1!",
"jsleq %1!",
seqsize(2,1) - seqsize(1,1)
},
{
"sgeq!jzer %1!",
"jsless %1!",
seqsize(2,1) - seqsize(1,1)
},
/* Test for zero (common case, especially for strings)
* E.g. the test expression of: "for (i=0; str{i}!=0; ++i)"
*
* zero.alt jzer n1
* jeq n1 -
* --------------------------------------
* zero.alt jnz n1
* jneq n1 -
*/
{
"zero.alt!jeq %1!",
"jzer %1!",
seqsize(2,1) - seqsize(1,1)
},
{
"zero.alt!jneq %1!",
"jnz %1!",
seqsize(2,1) - seqsize(1,1)
},
/* Incrementing and decrementing leaves a value in
* in PRI which may not be used (for example, as the
* third expression in a "for" loop).
* inc n1 inc n1 ; ++n
* load.pri n1 ;$exp
* ;$exp -
* --------------------------------------
* load.pri n1 inc n1 ; n++, e.g. "for (n=0; n<10; n++)"
* inc n1 ;$exp
* ;$exp -
* Plus the varieties for stack relative increments
* and decrements.
*/
{
"inc %1!load.pri %1!;$exp!",
"inc %1!;$exp!",
seqsize(2,2) - seqsize(1,1)
},
{
"load.pri %1!inc %1!;$exp!",
"inc %1!;$exp!",
seqsize(2,2) - seqsize(1,1)
},
{
"inc.s %1!load.s.pri %1!;$exp!",
"inc.s %1!;$exp!",
seqsize(2,2) - seqsize(1,1)
},
{
"load.s.pri %1!inc.s %1!;$exp!",
"inc.s %1!;$exp!",
seqsize(2,2) - seqsize(1,1)
},
{
"dec %1!load.pri %1!;$exp!",
"dec %1!;$exp!",
seqsize(2,2) - seqsize(1,1)
},
{
"load.pri %1!dec %1!;$exp!",
"dec %1!;$exp!",
seqsize(2,2) - seqsize(1,1)
},
{
"dec.s %1!load.s.pri %1!;$exp!",
"dec.s %1!;$exp!",
seqsize(2,2) - seqsize(1,1)
},
{
"load.s.pri %1!dec.s %1!;$exp!",
"dec.s %1!;$exp!",
seqsize(2,2) - seqsize(1,1)
},
/* ??? the same (increments and decrements) for references */
/* Loading the constant zero has a special opcode.
* When storing zero in memory, the value of PRI must not be later on.
* const.pri 0 zero n1
* stor.pri n1 ;$exp
* ;$exp -
* --------------------------------------
* const.pri 0 zero.s n1
* stor.s.pri n1 ;$exp
* ;$exp -
* --------------------------------------
* zero.pri zero n1
* stor.pri n1 ;$exp
* ;$exp -
* --------------------------------------
* zero.pri zero.s n1
* stor.s.pri n1 ;$exp
* ;$exp -
* --------------------------------------
* const.pri 0 zero.pri
* --------------------------------------
* const.alt 0 zero.alt
* The last two alternatives save more memory than they save
* time, but anyway...
*/
{
"const.pri 0!stor.pri %1!;$exp!",
"zero %1!;$exp!",
seqsize(2,2) - seqsize(1,1)
},
{
"const.pri 0!stor.s.pri %1!;$exp!",
"zero.s %1!;$exp!",
seqsize(2,2) - seqsize(1,1)
},
{
"zero.pri!stor.pri %1!;$exp!",
"zero %1!;$exp!",
seqsize(2,1) - seqsize(1,1)
},
{
"zero.pri!stor.s.pri %1!;$exp!",
"zero.s %1!;$exp!",
seqsize(2,1) - seqsize(1,1)
},
{
"const.pri 0!",
"zero.pri!",
seqsize(1,1) - seqsize(1,0)
},
{
"const.alt 0!",
"zero.alt!",
seqsize(1,1) - seqsize(1,0)
},
/* ----- */
{ NULL, NULL, 0 }
};
Reference in New Issue Copy Permalink