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Do constant folding for unary operations. 

Perform constant folding for NOT and EXT{8,16,32}{S,U} 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 16:37:17 +04:00 committed by Blue Swirl
parent 55c0975c5b
commit a640f03178
1 changed files with 59 additions and 0 deletions
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59
tcg/optimize.c
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@ -107,6 +107,11 @@ static int op_bits(int op)
case INDEX_op_sar_i32:
case INDEX_op_rotl_i32:
case INDEX_op_rotr_i32:
case INDEX_op_not_i32:
case INDEX_op_ext8s_i32:
case INDEX_op_ext16s_i32:
case INDEX_op_ext8u_i32:
case INDEX_op_ext16u_i32:
return 32;
#if TCG_TARGET_REG_BITS == 64
case INDEX_op_mov_i64:
@ -121,6 +126,13 @@ static int op_bits(int op)
case INDEX_op_sar_i64:
case INDEX_op_rotl_i64:
case INDEX_op_rotr_i64:
case INDEX_op_not_i64:
case INDEX_op_ext8s_i64:
case INDEX_op_ext16s_i64:
case INDEX_op_ext32s_i64:
case INDEX_op_ext8u_i64:
case INDEX_op_ext16u_i64:
case INDEX_op_ext32u_i64:
return 64;
#endif
default:
@ -267,6 +279,29 @@ static TCGArg do_constant_folding_2(int op, TCGArg x, TCGArg y)
return x;
#endif
CASE_OP_32_64(not):
return ~x;
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;
#if TCG_TARGET_REG_BITS == 64
case INDEX_op_ext32s_i64:
return (int32_t)x;
case INDEX_op_ext32u_i64:
return (uint32_t)x;
#endif
default:
fprintf(stderr,
"Unrecognized operation %d in do_constant_folding.\n", op);
@ -424,6 +459,30 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
gen_args += 2;
args += 2;
break;
CASE_OP_32_64(not):
CASE_OP_32_64(ext8s):
CASE_OP_32_64(ext16s):
CASE_OP_32_64(ext8u):
CASE_OP_32_64(ext16u):
#if TCG_TARGET_REG_BITS == 64
case INDEX_op_ext32s_i64:
case INDEX_op_ext32u_i64:
#endif
if (temps[args[1]].state == TCG_TEMP_CONST) {
gen_opc_buf[op_index] = op_to_movi(op);
tmp = do_constant_folding(op, temps[args[1]].val, 0);
tcg_opt_gen_movi(gen_args, args[0], tmp, nb_temps, nb_globals);
gen_args += 2;
args += 2;
break;
} else {
reset_temp(args[0], nb_temps, nb_globals);
gen_args[0] = args[0];
gen_args[1] = args[1];
gen_args += 2;
args += 2;
break;
}
CASE_OP_32_64(add):
CASE_OP_32_64(sub):
CASE_OP_32_64(mul):