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-rw-r--r--qemu/tcg/optimize.c1331
1 files changed, 0 insertions, 1331 deletions
diff --git a/qemu/tcg/optimize.c b/qemu/tcg/optimize.c
deleted file mode 100644
index f01160815..000000000
--- a/qemu/tcg/optimize.c
+++ /dev/null
@@ -1,1331 +0,0 @@
-/*
- * Optimizations for Tiny Code Generator for QEMU
- *
- * Copyright (c) 2010 Samsung Electronics.
- * Contributed by Kirill Batuzov <batuzovk@ispras.ru>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-#include "qemu/osdep.h"
-
-
-#include "qemu-common.h"
-#include "tcg-op.h"
-
-#define CASE_OP_32_64(x) \
- glue(glue(case INDEX_op_, x), _i32): \
- glue(glue(case INDEX_op_, x), _i64)
-
-struct tcg_temp_info {
- bool is_const;
- uint16_t prev_copy;
- uint16_t next_copy;
- tcg_target_ulong val;
- tcg_target_ulong mask;
-};
-
-static struct tcg_temp_info temps[TCG_MAX_TEMPS];
-static TCGTempSet temps_used;
-
-static inline bool temp_is_const(TCGArg arg)
-{
- return temps[arg].is_const;
-}
-
-static inline bool temp_is_copy(TCGArg arg)
-{
- return temps[arg].next_copy != arg;
-}
-
-/* Reset TEMP's state, possibly removing the temp for the list of copies. */
-static void reset_temp(TCGArg temp)
-{
- temps[temps[temp].next_copy].prev_copy = temps[temp].prev_copy;
- temps[temps[temp].prev_copy].next_copy = temps[temp].next_copy;
- temps[temp].next_copy = temp;
- temps[temp].prev_copy = temp;
- temps[temp].is_const = false;
- temps[temp].mask = -1;
-}
-
-/* Reset all temporaries, given that there are NB_TEMPS of them. */
-static void reset_all_temps(int nb_temps)
-{
- bitmap_zero(temps_used.l, nb_temps);
-}
-
-/* Initialize and activate a temporary. */
-static void init_temp_info(TCGArg temp)
-{
- if (!test_bit(temp, temps_used.l)) {
- temps[temp].next_copy = temp;
- temps[temp].prev_copy = temp;
- temps[temp].is_const = false;
- temps[temp].mask = -1;
- set_bit(temp, temps_used.l);
- }
-}
-
-static TCGOp *insert_op_before(TCGContext *s, TCGOp *old_op,
- TCGOpcode opc, int nargs)
-{
- int oi = s->gen_next_op_idx;
- int pi = s->gen_next_parm_idx;
- int prev = old_op->prev;
- int next = old_op - s->gen_op_buf;
- TCGOp *new_op;
-
- tcg_debug_assert(oi < OPC_BUF_SIZE);
- tcg_debug_assert(pi + nargs <= OPPARAM_BUF_SIZE);
- s->gen_next_op_idx = oi + 1;
- s->gen_next_parm_idx = pi + nargs;
-
- new_op = &s->gen_op_buf[oi];
- *new_op = (TCGOp){
- .opc = opc,
- .args = pi,
- .prev = prev,
- .next = next
- };
- if (prev >= 0) {
- s->gen_op_buf[prev].next = oi;
- } else {
- s->gen_first_op_idx = oi;
- }
- old_op->prev = oi;
-
- return new_op;
-}
-
-static int op_bits(TCGOpcode op)
-{
- const TCGOpDef *def = &tcg_op_defs[op];
- return def->flags & TCG_OPF_64BIT ? 64 : 32;
-}
-
-static TCGOpcode op_to_mov(TCGOpcode op)
-{
- switch (op_bits(op)) {
- case 32:
- return INDEX_op_mov_i32;
- case 64:
- return INDEX_op_mov_i64;
- default:
- fprintf(stderr, "op_to_mov: unexpected return value of "
- "function op_bits.\n");
- tcg_abort();
- }
-}
-
-static TCGOpcode op_to_movi(TCGOpcode op)
-{
- switch (op_bits(op)) {
- case 32:
- return INDEX_op_movi_i32;
- case 64:
- return INDEX_op_movi_i64;
- default:
- fprintf(stderr, "op_to_movi: unexpected return value of "
- "function op_bits.\n");
- tcg_abort();
- }
-}
-
-static TCGArg find_better_copy(TCGContext *s, TCGArg temp)
-{
- TCGArg i;
-
- /* If this is already a global, we can't do better. */
- if (temp < s->nb_globals) {
- return temp;
- }
-
- /* Search for a global first. */
- for (i = temps[temp].next_copy ; i != temp ; i = temps[i].next_copy) {
- if (i < s->nb_globals) {
- return i;
- }
- }
-
- /* If it is a temp, search for a temp local. */
- if (!s->temps[temp].temp_local) {
- for (i = temps[temp].next_copy ; i != temp ; i = temps[i].next_copy) {
- if (s->temps[i].temp_local) {
- return i;
- }
- }
- }
-
- /* Failure to find a better representation, return the same temp. */
- return temp;
-}
-
-static bool temps_are_copies(TCGArg arg1, TCGArg arg2)
-{
- TCGArg i;
-
- if (arg1 == arg2) {
- return true;
- }
-
- if (!temp_is_copy(arg1) || !temp_is_copy(arg2)) {
- return false;
- }
-
- for (i = temps[arg1].next_copy ; i != arg1 ; i = temps[i].next_copy) {
- if (i == arg2) {
- return true;
- }
- }
-
- return false;
-}
-
-static void tcg_opt_gen_movi(TCGContext *s, TCGOp *op, TCGArg *args,
- TCGArg dst, TCGArg val)
-{
- TCGOpcode new_op = op_to_movi(op->opc);
- tcg_target_ulong mask;
-
- op->opc = new_op;
-
- reset_temp(dst);
- temps[dst].is_const = true;
- temps[dst].val = val;
- mask = val;
- if (TCG_TARGET_REG_BITS > 32 && new_op == INDEX_op_movi_i32) {
- /* High bits of the destination are now garbage. */
- mask |= ~0xffffffffull;
- }
- temps[dst].mask = mask;
-
- args[0] = dst;
- args[1] = val;
-}
-
-static void tcg_opt_gen_mov(TCGContext *s, TCGOp *op, TCGArg *args,
- TCGArg dst, TCGArg src)
-{
- if (temps_are_copies(dst, src)) {
- tcg_op_remove(s, op);
- return;
- }
-
- TCGOpcode new_op = op_to_mov(op->opc);
- tcg_target_ulong mask;
-
- op->opc = new_op;
-
- reset_temp(dst);
- mask = temps[src].mask;
- if (TCG_TARGET_REG_BITS > 32 && new_op == INDEX_op_mov_i32) {
- /* High bits of the destination are now garbage. */
- mask |= ~0xffffffffull;
- }
- temps[dst].mask = mask;
-
- if (s->temps[src].type == s->temps[dst].type) {
- temps[dst].next_copy = temps[src].next_copy;
- temps[dst].prev_copy = src;
- temps[temps[dst].next_copy].prev_copy = dst;
- temps[src].next_copy = dst;
- temps[dst].is_const = temps[src].is_const;
- temps[dst].val = temps[src].val;
- }
-
- args[0] = dst;
- args[1] = src;
-}
-
-static TCGArg do_constant_folding_2(TCGOpcode op, TCGArg x, TCGArg y)
-{
- uint64_t l64, h64;
-
- switch (op) {
- CASE_OP_32_64(add):
- return x + y;
-
- CASE_OP_32_64(sub):
- return x - y;
-
- CASE_OP_32_64(mul):
- return x * y;
-
- CASE_OP_32_64(and):
- return x & y;
-
- CASE_OP_32_64(or):
- return x | y;
-
- CASE_OP_32_64(xor):
- return x ^ y;
-
- case INDEX_op_shl_i32:
- return (uint32_t)x << (y & 31);
-
- case INDEX_op_shl_i64:
- return (uint64_t)x << (y & 63);
-
- case INDEX_op_shr_i32:
- return (uint32_t)x >> (y & 31);
-
- case INDEX_op_shr_i64:
- return (uint64_t)x >> (y & 63);
-
- case INDEX_op_sar_i32:
- return (int32_t)x >> (y & 31);
-
- case INDEX_op_sar_i64:
- return (int64_t)x >> (y & 63);
-
- case INDEX_op_rotr_i32:
- return ror32(x, y & 31);
-
- case INDEX_op_rotr_i64:
- return ror64(x, y & 63);
-
- case INDEX_op_rotl_i32:
- return rol32(x, y & 31);
-
- case INDEX_op_rotl_i64:
- return rol64(x, y & 63);
-
- CASE_OP_32_64(not):
- return ~x;
-
- CASE_OP_32_64(neg):
- return -x;
-
- CASE_OP_32_64(andc):
- return x & ~y;
-
- CASE_OP_32_64(orc):
- return x | ~y;
-
- CASE_OP_32_64(eqv):
- return ~(x ^ y);
-
- CASE_OP_32_64(nand):
- return ~(x & y);
-
- CASE_OP_32_64(nor):
- return ~(x | y);
-
- CASE_OP_32_64(ext8s):
- return (int8_t)x;
-
- CASE_OP_32_64(ext16s):
- return (int16_t)x;
-
- CASE_OP_32_64(ext8u):
- return (uint8_t)x;
-
- CASE_OP_32_64(ext16u):
- return (uint16_t)x;
-
- case INDEX_op_ext_i32_i64:
- case INDEX_op_ext32s_i64:
- return (int32_t)x;
-
- case INDEX_op_extu_i32_i64:
- case INDEX_op_extrl_i64_i32:
- case INDEX_op_ext32u_i64:
- return (uint32_t)x;
-
- case INDEX_op_extrh_i64_i32:
- return (uint64_t)x >> 32;
-
- case INDEX_op_muluh_i32:
- return ((uint64_t)(uint32_t)x * (uint32_t)y) >> 32;
- case INDEX_op_mulsh_i32:
- return ((int64_t)(int32_t)x * (int32_t)y) >> 32;
-
- case INDEX_op_muluh_i64:
- mulu64(&l64, &h64, x, y);
- return h64;
- case INDEX_op_mulsh_i64:
- muls64(&l64, &h64, x, y);
- return h64;
-
- case INDEX_op_div_i32:
- /* Avoid crashing on divide by zero, otherwise undefined. */
- return (int32_t)x / ((int32_t)y ? : 1);
- case INDEX_op_divu_i32:
- return (uint32_t)x / ((uint32_t)y ? : 1);
- case INDEX_op_div_i64:
- return (int64_t)x / ((int64_t)y ? : 1);
- case INDEX_op_divu_i64:
- return (uint64_t)x / ((uint64_t)y ? : 1);
-
- case INDEX_op_rem_i32:
- return (int32_t)x % ((int32_t)y ? : 1);
- case INDEX_op_remu_i32:
- return (uint32_t)x % ((uint32_t)y ? : 1);
- case INDEX_op_rem_i64:
- return (int64_t)x % ((int64_t)y ? : 1);
- case INDEX_op_remu_i64:
- return (uint64_t)x % ((uint64_t)y ? : 1);
-
- default:
- fprintf(stderr,
- "Unrecognized operation %d in do_constant_folding.\n", op);
- tcg_abort();
- }
-}
-
-static TCGArg do_constant_folding(TCGOpcode op, TCGArg x, TCGArg y)
-{
- TCGArg res = do_constant_folding_2(op, x, y);
- if (op_bits(op) == 32) {
- res = (int32_t)res;
- }
- return res;
-}
-
-static bool do_constant_folding_cond_32(uint32_t x, uint32_t y, TCGCond c)
-{
- switch (c) {
- case TCG_COND_EQ:
- return x == y;
- case TCG_COND_NE:
- return x != y;
- case TCG_COND_LT:
- return (int32_t)x < (int32_t)y;
- case TCG_COND_GE:
- return (int32_t)x >= (int32_t)y;
- case TCG_COND_LE:
- return (int32_t)x <= (int32_t)y;
- case TCG_COND_GT:
- return (int32_t)x > (int32_t)y;
- case TCG_COND_LTU:
- return x < y;
- case TCG_COND_GEU:
- return x >= y;
- case TCG_COND_LEU:
- return x <= y;
- case TCG_COND_GTU:
- return x > y;
- default:
- tcg_abort();
- }
-}
-
-static bool do_constant_folding_cond_64(uint64_t x, uint64_t y, TCGCond c)
-{
- switch (c) {
- case TCG_COND_EQ:
- return x == y;
- case TCG_COND_NE:
- return x != y;
- case TCG_COND_LT:
- return (int64_t)x < (int64_t)y;
- case TCG_COND_GE:
- return (int64_t)x >= (int64_t)y;
- case TCG_COND_LE:
- return (int64_t)x <= (int64_t)y;
- case TCG_COND_GT:
- return (int64_t)x > (int64_t)y;
- case TCG_COND_LTU:
- return x < y;
- case TCG_COND_GEU:
- return x >= y;
- case TCG_COND_LEU:
- return x <= y;
- case TCG_COND_GTU:
- return x > y;
- default:
- tcg_abort();
- }
-}
-
-static bool do_constant_folding_cond_eq(TCGCond c)
-{
- switch (c) {
- case TCG_COND_GT:
- case TCG_COND_LTU:
- case TCG_COND_LT:
- case TCG_COND_GTU:
- case TCG_COND_NE:
- return 0;
- case TCG_COND_GE:
- case TCG_COND_GEU:
- case TCG_COND_LE:
- case TCG_COND_LEU:
- case TCG_COND_EQ:
- return 1;
- default:
- tcg_abort();
- }
-}
-
-/* Return 2 if the condition can't be simplified, and the result
- of the condition (0 or 1) if it can */
-static TCGArg do_constant_folding_cond(TCGOpcode op, TCGArg x,
- TCGArg y, TCGCond c)
-{
- if (temp_is_const(x) && temp_is_const(y)) {
- switch (op_bits(op)) {
- case 32:
- return do_constant_folding_cond_32(temps[x].val, temps[y].val, c);
- case 64:
- return do_constant_folding_cond_64(temps[x].val, temps[y].val, c);
- default:
- tcg_abort();
- }
- } else if (temps_are_copies(x, y)) {
- return do_constant_folding_cond_eq(c);
- } else if (temp_is_const(y) && temps[y].val == 0) {
- switch (c) {
- case TCG_COND_LTU:
- return 0;
- case TCG_COND_GEU:
- return 1;
- default:
- return 2;
- }
- } else {
- return 2;
- }
-}
-
-/* Return 2 if the condition can't be simplified, and the result
- of the condition (0 or 1) if it can */
-static TCGArg do_constant_folding_cond2(TCGArg *p1, TCGArg *p2, TCGCond c)
-{
- TCGArg al = p1[0], ah = p1[1];
- TCGArg bl = p2[0], bh = p2[1];
-
- if (temp_is_const(bl) && temp_is_const(bh)) {
- uint64_t b = ((uint64_t)temps[bh].val << 32) | (uint32_t)temps[bl].val;
-
- if (temp_is_const(al) && temp_is_const(ah)) {
- uint64_t a;
- a = ((uint64_t)temps[ah].val << 32) | (uint32_t)temps[al].val;
- return do_constant_folding_cond_64(a, b, c);
- }
- if (b == 0) {
- switch (c) {
- case TCG_COND_LTU:
- return 0;
- case TCG_COND_GEU:
- return 1;
- default:
- break;
- }
- }
- }
- if (temps_are_copies(al, bl) && temps_are_copies(ah, bh)) {
- return do_constant_folding_cond_eq(c);
- }
- return 2;
-}
-
-static bool swap_commutative(TCGArg dest, TCGArg *p1, TCGArg *p2)
-{
- TCGArg a1 = *p1, a2 = *p2;
- int sum = 0;
- sum += temp_is_const(a1);
- sum -= temp_is_const(a2);
-
- /* Prefer the constant in second argument, and then the form
- op a, a, b, which is better handled on non-RISC hosts. */
- if (sum > 0 || (sum == 0 && dest == a2)) {
- *p1 = a2;
- *p2 = a1;
- return true;
- }
- return false;
-}
-
-static bool swap_commutative2(TCGArg *p1, TCGArg *p2)
-{
- int sum = 0;
- sum += temp_is_const(p1[0]);
- sum += temp_is_const(p1[1]);
- sum -= temp_is_const(p2[0]);
- sum -= temp_is_const(p2[1]);
- if (sum > 0) {
- TCGArg t;
- t = p1[0], p1[0] = p2[0], p2[0] = t;
- t = p1[1], p1[1] = p2[1], p2[1] = t;
- return true;
- }
- return false;
-}
-
-/* Propagate constants and copies, fold constant expressions. */
-void tcg_optimize(TCGContext *s)
-{
- int oi, oi_next, nb_temps, nb_globals;
-
- /* Array VALS has an element for each temp.
- If this temp holds a constant then its value is kept in VALS' element.
- If this temp is a copy of other ones then the other copies are
- available through the doubly linked circular list. */
-
- nb_temps = s->nb_temps;
- nb_globals = s->nb_globals;
- reset_all_temps(nb_temps);
-
- for (oi = s->gen_first_op_idx; oi >= 0; oi = oi_next) {
- tcg_target_ulong mask, partmask, affected;
- int nb_oargs, nb_iargs, i;
- TCGArg tmp;
-
- TCGOp * const op = &s->gen_op_buf[oi];
- TCGArg * const args = &s->gen_opparam_buf[op->args];
- TCGOpcode opc = op->opc;
- const TCGOpDef *def = &tcg_op_defs[opc];
-
- oi_next = op->next;
-
- /* Count the arguments, and initialize the temps that are
- going to be used */
- if (opc == INDEX_op_call) {
- nb_oargs = op->callo;
- nb_iargs = op->calli;
- for (i = 0; i < nb_oargs + nb_iargs; i++) {
- tmp = args[i];
- if (tmp != TCG_CALL_DUMMY_ARG) {
- init_temp_info(tmp);
- }
- }
- } else {
- nb_oargs = def->nb_oargs;
- nb_iargs = def->nb_iargs;
- for (i = 0; i < nb_oargs + nb_iargs; i++) {
- init_temp_info(args[i]);
- }
- }
-
- /* Do copy propagation */
- for (i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
- if (temp_is_copy(args[i])) {
- args[i] = find_better_copy(s, args[i]);
- }
- }
-
- /* For commutative operations make constant second argument */
- switch (opc) {
- CASE_OP_32_64(add):
- CASE_OP_32_64(mul):
- CASE_OP_32_64(and):
- CASE_OP_32_64(or):
- CASE_OP_32_64(xor):
- CASE_OP_32_64(eqv):
- CASE_OP_32_64(nand):
- CASE_OP_32_64(nor):
- CASE_OP_32_64(muluh):
- CASE_OP_32_64(mulsh):
- swap_commutative(args[0], &args[1], &args[2]);
- break;
- CASE_OP_32_64(brcond):
- if (swap_commutative(-1, &args[0], &args[1])) {
- args[2] = tcg_swap_cond(args[2]);
- }
- break;
- CASE_OP_32_64(setcond):
- if (swap_commutative(args[0], &args[1], &args[2])) {
- args[3] = tcg_swap_cond(args[3]);
- }
- break;
- CASE_OP_32_64(movcond):
- if (swap_commutative(-1, &args[1], &args[2])) {
- args[5] = tcg_swap_cond(args[5]);
- }
- /* For movcond, we canonicalize the "false" input reg to match
- the destination reg so that the tcg backend can implement
- a "move if true" operation. */
- if (swap_commutative(args[0], &args[4], &args[3])) {
- args[5] = tcg_invert_cond(args[5]);
- }
- break;
- CASE_OP_32_64(add2):
- swap_commutative(args[0], &args[2], &args[4]);
- swap_commutative(args[1], &args[3], &args[5]);
- break;
- CASE_OP_32_64(mulu2):
- CASE_OP_32_64(muls2):
- swap_commutative(args[0], &args[2], &args[3]);
- break;
- case INDEX_op_brcond2_i32:
- if (swap_commutative2(&args[0], &args[2])) {
- args[4] = tcg_swap_cond(args[4]);
- }
- break;
- case INDEX_op_setcond2_i32:
- if (swap_commutative2(&args[1], &args[3])) {
- args[5] = tcg_swap_cond(args[5]);
- }
- break;
- default:
- break;
- }
-
- /* Simplify expressions for "shift/rot r, 0, a => movi r, 0",
- and "sub r, 0, a => neg r, a" case. */
- switch (opc) {
- CASE_OP_32_64(shl):
- CASE_OP_32_64(shr):
- CASE_OP_32_64(sar):
- CASE_OP_32_64(rotl):
- CASE_OP_32_64(rotr):
- if (temp_is_const(args[1]) && temps[args[1]].val == 0) {
- tcg_opt_gen_movi(s, op, args, args[0], 0);
- continue;
- }
- break;
- CASE_OP_32_64(sub):
- {
- TCGOpcode neg_op;
- bool have_neg;
-
- if (temp_is_const(args[2])) {
- /* Proceed with possible constant folding. */
- break;
- }
- if (opc == INDEX_op_sub_i32) {
- neg_op = INDEX_op_neg_i32;
- have_neg = TCG_TARGET_HAS_neg_i32;
- } else {
- neg_op = INDEX_op_neg_i64;
- have_neg = TCG_TARGET_HAS_neg_i64;
- }
- if (!have_neg) {
- break;
- }
- if (temp_is_const(args[1]) && temps[args[1]].val == 0) {
- op->opc = neg_op;
- reset_temp(args[0]);
- args[1] = args[2];
- continue;
- }
- }
- break;
- CASE_OP_32_64(xor):
- CASE_OP_32_64(nand):
- if (!temp_is_const(args[1])
- && temp_is_const(args[2]) && temps[args[2]].val == -1) {
- i = 1;
- goto try_not;
- }
- break;
- CASE_OP_32_64(nor):
- if (!temp_is_const(args[1])
- && temp_is_const(args[2]) && temps[args[2]].val == 0) {
- i = 1;
- goto try_not;
- }
- break;
- CASE_OP_32_64(andc):
- if (!temp_is_const(args[2])
- && temp_is_const(args[1]) && temps[args[1]].val == -1) {
- i = 2;
- goto try_not;
- }
- break;
- CASE_OP_32_64(orc):
- CASE_OP_32_64(eqv):
- if (!temp_is_const(args[2])
- && temp_is_const(args[1]) && temps[args[1]].val == 0) {
- i = 2;
- goto try_not;
- }
- break;
- try_not:
- {
- TCGOpcode not_op;
- bool have_not;
-
- if (def->flags & TCG_OPF_64BIT) {
- not_op = INDEX_op_not_i64;
- have_not = TCG_TARGET_HAS_not_i64;
- } else {
- not_op = INDEX_op_not_i32;
- have_not = TCG_TARGET_HAS_not_i32;
- }
- if (!have_not) {
- break;
- }
- op->opc = not_op;
- reset_temp(args[0]);
- args[1] = args[i];
- continue;
- }
- default:
- break;
- }
-
- /* Simplify expression for "op r, a, const => mov r, a" cases */
- switch (opc) {
- CASE_OP_32_64(add):
- CASE_OP_32_64(sub):
- CASE_OP_32_64(shl):
- CASE_OP_32_64(shr):
- CASE_OP_32_64(sar):
- CASE_OP_32_64(rotl):
- CASE_OP_32_64(rotr):
- CASE_OP_32_64(or):
- CASE_OP_32_64(xor):
- CASE_OP_32_64(andc):
- if (!temp_is_const(args[1])
- && temp_is_const(args[2]) && temps[args[2]].val == 0) {
- tcg_opt_gen_mov(s, op, args, args[0], args[1]);
- continue;
- }
- break;
- CASE_OP_32_64(and):
- CASE_OP_32_64(orc):
- CASE_OP_32_64(eqv):
- if (!temp_is_const(args[1])
- && temp_is_const(args[2]) && temps[args[2]].val == -1) {
- tcg_opt_gen_mov(s, op, args, args[0], args[1]);
- continue;
- }
- break;
- default:
- break;
- }
-
- /* Simplify using known-zero bits. Currently only ops with a single
- output argument is supported. */
- mask = -1;
- affected = -1;
- switch (opc) {
- CASE_OP_32_64(ext8s):
- if ((temps[args[1]].mask & 0x80) != 0) {
- break;
- }
- CASE_OP_32_64(ext8u):
- mask = 0xff;
- goto and_const;
- CASE_OP_32_64(ext16s):
- if ((temps[args[1]].mask & 0x8000) != 0) {
- break;
- }
- CASE_OP_32_64(ext16u):
- mask = 0xffff;
- goto and_const;
- case INDEX_op_ext32s_i64:
- if ((temps[args[1]].mask & 0x80000000) != 0) {
- break;
- }
- case INDEX_op_ext32u_i64:
- mask = 0xffffffffU;
- goto and_const;
-
- CASE_OP_32_64(and):
- mask = temps[args[2]].mask;
- if (temp_is_const(args[2])) {
- and_const:
- affected = temps[args[1]].mask & ~mask;
- }
- mask = temps[args[1]].mask & mask;
- break;
-
- case INDEX_op_ext_i32_i64:
- if ((temps[args[1]].mask & 0x80000000) != 0) {
- break;
- }
- case INDEX_op_extu_i32_i64:
- /* We do not compute affected as it is a size changing op. */
- mask = (uint32_t)temps[args[1]].mask;
- break;
-
- CASE_OP_32_64(andc):
- /* Known-zeros does not imply known-ones. Therefore unless
- args[2] is constant, we can't infer anything from it. */
- if (temp_is_const(args[2])) {
- mask = ~temps[args[2]].mask;
- goto and_const;
- }
- /* But we certainly know nothing outside args[1] may be set. */
- mask = temps[args[1]].mask;
- break;
-
- case INDEX_op_sar_i32:
- if (temp_is_const(args[2])) {
- tmp = temps[args[2]].val & 31;
- mask = (int32_t)temps[args[1]].mask >> tmp;
- }
- break;
- case INDEX_op_sar_i64:
- if (temp_is_const(args[2])) {
- tmp = temps[args[2]].val & 63;
- mask = (int64_t)temps[args[1]].mask >> tmp;
- }
- break;
-
- case INDEX_op_shr_i32:
- if (temp_is_const(args[2])) {
- tmp = temps[args[2]].val & 31;
- mask = (uint32_t)temps[args[1]].mask >> tmp;
- }
- break;
- case INDEX_op_shr_i64:
- if (temp_is_const(args[2])) {
- tmp = temps[args[2]].val & 63;
- mask = (uint64_t)temps[args[1]].mask >> tmp;
- }
- break;
-
- case INDEX_op_extrl_i64_i32:
- mask = (uint32_t)temps[args[1]].mask;
- break;
- case INDEX_op_extrh_i64_i32:
- mask = (uint64_t)temps[args[1]].mask >> 32;
- break;
-
- CASE_OP_32_64(shl):
- if (temp_is_const(args[2])) {
- tmp = temps[args[2]].val & (TCG_TARGET_REG_BITS - 1);
- mask = temps[args[1]].mask << tmp;
- }
- break;
-
- CASE_OP_32_64(neg):
- /* Set to 1 all bits to the left of the rightmost. */
- mask = -(temps[args[1]].mask & -temps[args[1]].mask);
- break;
-
- CASE_OP_32_64(deposit):
- mask = deposit64(temps[args[1]].mask, args[3], args[4],
- temps[args[2]].mask);
- break;
-
- CASE_OP_32_64(or):
- CASE_OP_32_64(xor):
- mask = temps[args[1]].mask | temps[args[2]].mask;
- break;
-
- CASE_OP_32_64(setcond):
- case INDEX_op_setcond2_i32:
- mask = 1;
- break;
-
- CASE_OP_32_64(movcond):
- mask = temps[args[3]].mask | temps[args[4]].mask;
- break;
-
- CASE_OP_32_64(ld8u):
- mask = 0xff;
- break;
- CASE_OP_32_64(ld16u):
- mask = 0xffff;
- break;
- case INDEX_op_ld32u_i64:
- mask = 0xffffffffu;
- break;
-
- CASE_OP_32_64(qemu_ld):
- {
- TCGMemOpIdx oi = args[nb_oargs + nb_iargs];
- TCGMemOp mop = get_memop(oi);
- if (!(mop & MO_SIGN)) {
- mask = (2ULL << ((8 << (mop & MO_SIZE)) - 1)) - 1;
- }
- }
- break;
-
- default:
- break;
- }
-
- /* 32-bit ops generate 32-bit results. For the result is zero test
- below, we can ignore high bits, but for further optimizations we
- need to record that the high bits contain garbage. */
- partmask = mask;
- if (!(def->flags & TCG_OPF_64BIT)) {
- mask |= ~(tcg_target_ulong)0xffffffffu;
- partmask &= 0xffffffffu;
- affected &= 0xffffffffu;
- }
-
- if (partmask == 0) {
- tcg_debug_assert(nb_oargs == 1);
- tcg_opt_gen_movi(s, op, args, args[0], 0);
- continue;
- }
- if (affected == 0) {
- tcg_debug_assert(nb_oargs == 1);
- tcg_opt_gen_mov(s, op, args, args[0], args[1]);
- continue;
- }
-
- /* Simplify expression for "op r, a, 0 => movi r, 0" cases */
- switch (opc) {
- CASE_OP_32_64(and):
- CASE_OP_32_64(mul):
- CASE_OP_32_64(muluh):
- CASE_OP_32_64(mulsh):
- if ((temp_is_const(args[2]) && temps[args[2]].val == 0)) {
- tcg_opt_gen_movi(s, op, args, args[0], 0);
- continue;
- }
- break;
- default:
- break;
- }
-
- /* Simplify expression for "op r, a, a => mov r, a" cases */
- switch (opc) {
- CASE_OP_32_64(or):
- CASE_OP_32_64(and):
- if (temps_are_copies(args[1], args[2])) {
- tcg_opt_gen_mov(s, op, args, args[0], args[1]);
- continue;
- }
- break;
- default:
- break;
- }
-
- /* Simplify expression for "op r, a, a => movi r, 0" cases */
- switch (opc) {
- CASE_OP_32_64(andc):
- CASE_OP_32_64(sub):
- CASE_OP_32_64(xor):
- if (temps_are_copies(args[1], args[2])) {
- tcg_opt_gen_movi(s, op, args, args[0], 0);
- continue;
- }
- break;
- default:
- break;
- }
-
- /* Propagate constants through copy operations and do constant
- folding. Constants will be substituted to arguments by register
- allocator where needed and possible. Also detect copies. */
- switch (opc) {
- CASE_OP_32_64(mov):
- tcg_opt_gen_mov(s, op, args, args[0], args[1]);
- break;
- CASE_OP_32_64(movi):
- tcg_opt_gen_movi(s, op, args, args[0], args[1]);
- break;
-
- CASE_OP_32_64(not):
- CASE_OP_32_64(neg):
- CASE_OP_32_64(ext8s):
- CASE_OP_32_64(ext8u):
- CASE_OP_32_64(ext16s):
- CASE_OP_32_64(ext16u):
- case INDEX_op_ext32s_i64:
- case INDEX_op_ext32u_i64:
- case INDEX_op_ext_i32_i64:
- case INDEX_op_extu_i32_i64:
- case INDEX_op_extrl_i64_i32:
- case INDEX_op_extrh_i64_i32:
- if (temp_is_const(args[1])) {
- tmp = do_constant_folding(opc, temps[args[1]].val, 0);
- tcg_opt_gen_movi(s, op, args, args[0], tmp);
- break;
- }
- goto do_default;
-
- CASE_OP_32_64(add):
- CASE_OP_32_64(sub):
- CASE_OP_32_64(mul):
- CASE_OP_32_64(or):
- CASE_OP_32_64(and):
- CASE_OP_32_64(xor):
- CASE_OP_32_64(shl):
- CASE_OP_32_64(shr):
- CASE_OP_32_64(sar):
- CASE_OP_32_64(rotl):
- CASE_OP_32_64(rotr):
- CASE_OP_32_64(andc):
- CASE_OP_32_64(orc):
- CASE_OP_32_64(eqv):
- CASE_OP_32_64(nand):
- CASE_OP_32_64(nor):
- CASE_OP_32_64(muluh):
- CASE_OP_32_64(mulsh):
- CASE_OP_32_64(div):
- CASE_OP_32_64(divu):
- CASE_OP_32_64(rem):
- CASE_OP_32_64(remu):
- if (temp_is_const(args[1]) && temp_is_const(args[2])) {
- tmp = do_constant_folding(opc, temps[args[1]].val,
- temps[args[2]].val);
- tcg_opt_gen_movi(s, op, args, args[0], tmp);
- break;
- }
- goto do_default;
-
- CASE_OP_32_64(deposit):
- if (temp_is_const(args[1]) && temp_is_const(args[2])) {
- tmp = deposit64(temps[args[1]].val, args[3], args[4],
- temps[args[2]].val);
- tcg_opt_gen_movi(s, op, args, args[0], tmp);
- break;
- }
- goto do_default;
-
- CASE_OP_32_64(setcond):
- tmp = do_constant_folding_cond(opc, args[1], args[2], args[3]);
- if (tmp != 2) {
- tcg_opt_gen_movi(s, op, args, args[0], tmp);
- break;
- }
- goto do_default;
-
- CASE_OP_32_64(brcond):
- tmp = do_constant_folding_cond(opc, args[0], args[1], args[2]);
- if (tmp != 2) {
- if (tmp) {
- reset_all_temps(nb_temps);
- op->opc = INDEX_op_br;
- args[0] = args[3];
- } else {
- tcg_op_remove(s, op);
- }
- break;
- }
- goto do_default;
-
- CASE_OP_32_64(movcond):
- tmp = do_constant_folding_cond(opc, args[1], args[2], args[5]);
- if (tmp != 2) {
- tcg_opt_gen_mov(s, op, args, args[0], args[4-tmp]);
- break;
- }
- goto do_default;
-
- case INDEX_op_add2_i32:
- case INDEX_op_sub2_i32:
- if (temp_is_const(args[2]) && temp_is_const(args[3])
- && temp_is_const(args[4]) && temp_is_const(args[5])) {
- uint32_t al = temps[args[2]].val;
- uint32_t ah = temps[args[3]].val;
- uint32_t bl = temps[args[4]].val;
- uint32_t bh = temps[args[5]].val;
- uint64_t a = ((uint64_t)ah << 32) | al;
- uint64_t b = ((uint64_t)bh << 32) | bl;
- TCGArg rl, rh;
- TCGOp *op2 = insert_op_before(s, op, INDEX_op_movi_i32, 2);
- TCGArg *args2 = &s->gen_opparam_buf[op2->args];
-
- if (opc == INDEX_op_add2_i32) {
- a += b;
- } else {
- a -= b;
- }
-
- rl = args[0];
- rh = args[1];
- tcg_opt_gen_movi(s, op, args, rl, (int32_t)a);
- tcg_opt_gen_movi(s, op2, args2, rh, (int32_t)(a >> 32));
-
- /* We've done all we need to do with the movi. Skip it. */
- oi_next = op2->next;
- break;
- }
- goto do_default;
-
- case INDEX_op_mulu2_i32:
- if (temp_is_const(args[2]) && temp_is_const(args[3])) {
- uint32_t a = temps[args[2]].val;
- uint32_t b = temps[args[3]].val;
- uint64_t r = (uint64_t)a * b;
- TCGArg rl, rh;
- TCGOp *op2 = insert_op_before(s, op, INDEX_op_movi_i32, 2);
- TCGArg *args2 = &s->gen_opparam_buf[op2->args];
-
- rl = args[0];
- rh = args[1];
- tcg_opt_gen_movi(s, op, args, rl, (int32_t)r);
- tcg_opt_gen_movi(s, op2, args2, rh, (int32_t)(r >> 32));
-
- /* We've done all we need to do with the movi. Skip it. */
- oi_next = op2->next;
- break;
- }
- goto do_default;
-
- case INDEX_op_brcond2_i32:
- tmp = do_constant_folding_cond2(&args[0], &args[2], args[4]);
- if (tmp != 2) {
- if (tmp) {
- do_brcond_true:
- reset_all_temps(nb_temps);
- op->opc = INDEX_op_br;
- args[0] = args[5];
- } else {
- do_brcond_false:
- tcg_op_remove(s, op);
- }
- } else if ((args[4] == TCG_COND_LT || args[4] == TCG_COND_GE)
- && temp_is_const(args[2]) && temps[args[2]].val == 0
- && temp_is_const(args[3]) && temps[args[3]].val == 0) {
- /* Simplify LT/GE comparisons vs zero to a single compare
- vs the high word of the input. */
- do_brcond_high:
- reset_all_temps(nb_temps);
- op->opc = INDEX_op_brcond_i32;
- args[0] = args[1];
- args[1] = args[3];
- args[2] = args[4];
- args[3] = args[5];
- } else if (args[4] == TCG_COND_EQ) {
- /* Simplify EQ comparisons where one of the pairs
- can be simplified. */
- tmp = do_constant_folding_cond(INDEX_op_brcond_i32,
- args[0], args[2], TCG_COND_EQ);
- if (tmp == 0) {
- goto do_brcond_false;
- } else if (tmp == 1) {
- goto do_brcond_high;
- }
- tmp = do_constant_folding_cond(INDEX_op_brcond_i32,
- args[1], args[3], TCG_COND_EQ);
- if (tmp == 0) {
- goto do_brcond_false;
- } else if (tmp != 1) {
- goto do_default;
- }
- do_brcond_low:
- reset_all_temps(nb_temps);
- op->opc = INDEX_op_brcond_i32;
- args[1] = args[2];
- args[2] = args[4];
- args[3] = args[5];
- } else if (args[4] == TCG_COND_NE) {
- /* Simplify NE comparisons where one of the pairs
- can be simplified. */
- tmp = do_constant_folding_cond(INDEX_op_brcond_i32,
- args[0], args[2], TCG_COND_NE);
- if (tmp == 0) {
- goto do_brcond_high;
- } else if (tmp == 1) {
- goto do_brcond_true;
- }
- tmp = do_constant_folding_cond(INDEX_op_brcond_i32,
- args[1], args[3], TCG_COND_NE);
- if (tmp == 0) {
- goto do_brcond_low;
- } else if (tmp == 1) {
- goto do_brcond_true;
- }
- goto do_default;
- } else {
- goto do_default;
- }
- break;
-
- case INDEX_op_setcond2_i32:
- tmp = do_constant_folding_cond2(&args[1], &args[3], args[5]);
- if (tmp != 2) {
- do_setcond_const:
- tcg_opt_gen_movi(s, op, args, args[0], tmp);
- } else if ((args[5] == TCG_COND_LT || args[5] == TCG_COND_GE)
- && temp_is_const(args[3]) && temps[args[3]].val == 0
- && temp_is_const(args[4]) && temps[args[4]].val == 0) {
- /* Simplify LT/GE comparisons vs zero to a single compare
- vs the high word of the input. */
- do_setcond_high:
- reset_temp(args[0]);
- temps[args[0]].mask = 1;
- op->opc = INDEX_op_setcond_i32;
- args[1] = args[2];
- args[2] = args[4];
- args[3] = args[5];
- } else if (args[5] == TCG_COND_EQ) {
- /* Simplify EQ comparisons where one of the pairs
- can be simplified. */
- tmp = do_constant_folding_cond(INDEX_op_setcond_i32,
- args[1], args[3], TCG_COND_EQ);
- if (tmp == 0) {
- goto do_setcond_const;
- } else if (tmp == 1) {
- goto do_setcond_high;
- }
- tmp = do_constant_folding_cond(INDEX_op_setcond_i32,
- args[2], args[4], TCG_COND_EQ);
- if (tmp == 0) {
- goto do_setcond_high;
- } else if (tmp != 1) {
- goto do_default;
- }
- do_setcond_low:
- reset_temp(args[0]);
- temps[args[0]].mask = 1;
- op->opc = INDEX_op_setcond_i32;
- args[2] = args[3];
- args[3] = args[5];
- } else if (args[5] == TCG_COND_NE) {
- /* Simplify NE comparisons where one of the pairs
- can be simplified. */
- tmp = do_constant_folding_cond(INDEX_op_setcond_i32,
- args[1], args[3], TCG_COND_NE);
- if (tmp == 0) {
- goto do_setcond_high;
- } else if (tmp == 1) {
- goto do_setcond_const;
- }
- tmp = do_constant_folding_cond(INDEX_op_setcond_i32,
- args[2], args[4], TCG_COND_NE);
- if (tmp == 0) {
- goto do_setcond_low;
- } else if (tmp == 1) {
- goto do_setcond_const;
- }
- goto do_default;
- } else {
- goto do_default;
- }
- break;
-
- case INDEX_op_call:
- if (!(args[nb_oargs + nb_iargs + 1]
- & (TCG_CALL_NO_READ_GLOBALS | TCG_CALL_NO_WRITE_GLOBALS))) {
- for (i = 0; i < nb_globals; i++) {
- if (test_bit(i, temps_used.l)) {
- reset_temp(i);
- }
- }
- }
- goto do_reset_output;
-
- default:
- do_default:
- /* Default case: we know nothing about operation (or were unable
- to compute the operation result) so no propagation is done.
- We trash everything if the operation is the end of a basic
- block, otherwise we only trash the output args. "mask" is
- the non-zero bits mask for the first output arg. */
- if (def->flags & TCG_OPF_BB_END) {
- reset_all_temps(nb_temps);
- } else {
- do_reset_output:
- for (i = 0; i < nb_oargs; i++) {
- reset_temp(args[i]);
- /* Save the corresponding known-zero bits mask for the
- first output argument (only one supported so far). */
- if (i == 0) {
- temps[args[i]].mask = mask;
- }
- }
- }
- break;
- }
- }
-}