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tcg: Add clz and ctz opcodes

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Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2016-11-16 09:23:28 +01:00
parent 17280ff4a5
commit 0e28d0063b
17 changed files with 266 additions and 0 deletions
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36
tcg/optimize.c
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@ -296,6 +296,18 @@ static TCGArg do_constant_folding_2(TCGOpcode op, TCGArg x, TCGArg y)
CASE_OP_32_64(nor):
return ~(x | y);
case INDEX_op_clz_i32:
return (uint32_t)x ? clz32(x) : y;
case INDEX_op_clz_i64:
return x ? clz64(x) : y;
case INDEX_op_ctz_i32:
return (uint32_t)x ? ctz32(x) : y;
case INDEX_op_ctz_i64:
return x ? ctz64(x) : y;
CASE_OP_32_64(ext8s):
return (int8_t)x;
@ -896,6 +908,16 @@ void tcg_optimize(TCGContext *s)
mask = temps[args[1]].mask | temps[args[2]].mask;
break;
case INDEX_op_clz_i32:
case INDEX_op_ctz_i32:
mask = temps[args[2]].mask | 31;
break;
case INDEX_op_clz_i64:
case INDEX_op_ctz_i64:
mask = temps[args[2]].mask | 63;
break;
CASE_OP_32_64(setcond):
case INDEX_op_setcond2_i32:
mask = 1;
@ -1052,6 +1074,20 @@ void tcg_optimize(TCGContext *s)
}
goto do_default;
CASE_OP_32_64(clz):
CASE_OP_32_64(ctz):
if (temp_is_const(args[1])) {
TCGArg v = temps[args[1]].val;
if (v != 0) {
tmp = do_constant_folding(opc, v, 0);
tcg_opt_gen_movi(s, op, args, args[0], tmp);
} else {
tcg_opt_gen_mov(s, op, args, args[0], args[2]);
}
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],