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Do constant folding for boolean operations. 

Perform constant folding for AND, OR, XOR operations.

Signed-off-by: Kirill Batuzov <batuzovk@ispras.ru>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Kirill Batuzov 2011-07-07 16:37:15 +04:00 committed by Blue Swirl
parent 53108fb574
commit 9a81090b12
1 changed files with 37 additions and 0 deletions
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37
tcg/optimize.c
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@ -99,12 +99,18 @@ static int op_bits(int op)
case INDEX_op_add_i32:
case INDEX_op_sub_i32:
case INDEX_op_mul_i32:
case INDEX_op_and_i32:
case INDEX_op_or_i32:
case INDEX_op_xor_i32:
return 32;
#if TCG_TARGET_REG_BITS == 64
case INDEX_op_mov_i64:
case INDEX_op_add_i64:
case INDEX_op_sub_i64:
case INDEX_op_mul_i64:
case INDEX_op_and_i64:
case INDEX_op_or_i64:
case INDEX_op_xor_i64:
return 64;
#endif
default:
@ -190,6 +196,15 @@ static TCGArg do_constant_folding_2(int op, TCGArg x, TCGArg 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;
default:
fprintf(stderr,
"Unrecognized operation %d in do_constant_folding.\n", op);
@ -246,6 +261,9 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
switch (op) {
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):
if (temps[args[1]].state == TCG_TEMP_CONST) {
tmp = args[1];
args[1] = args[2];
@ -291,6 +309,22 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
continue;
}
break;
CASE_OP_32_64(or):
CASE_OP_32_64(and):
if (args[1] == args[2]) {
if (args[1] == args[0]) {
args += 3;
gen_opc_buf[op_index] = INDEX_op_nop;
} else {
gen_opc_buf[op_index] = op_to_mov(op);
tcg_opt_gen_mov(gen_args, args[0], args[1], nb_temps,
nb_globals);
gen_args += 2;
args += 3;
}
continue;
}
break;
}
/* Propagate constants through copy operations and do constant
@ -326,6 +360,9 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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):
if (temps[args[1]].state == TCG_TEMP_CONST
&& temps[args[2]].state == TCG_TEMP_CONST) {
gen_opc_buf[op_index] = op_to_movi(op);