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tcg: Handle new bswap flags during optimize

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Notice when the input is known to be zero-extended and force
the TCG_BSWAP_IZ flag on.  Honor the TCG_BSWAP_OS bit during
constant folding.  Propagate the input to the output mask.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-06-13 13:04:00 -07:00
parent 0d57d36af5
commit 0b76ff8f1b
1 changed files with 51 additions and 5 deletions
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56
tcg/optimize.c
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@ -355,10 +355,12 @@ static uint64_t do_constant_folding_2(TCGOpcode op, uint64_t x, uint64_t y)
return (uint16_t)x;
CASE_OP_32_64(bswap16):
return bswap16(x);
x = bswap16(x);
return y & TCG_BSWAP_OS ? (int16_t)x : x;
CASE_OP_32_64(bswap32):
return bswap32(x);
x = bswap32(x);
return y & TCG_BSWAP_OS ? (int32_t)x : x;
case INDEX_op_bswap64_i64:
return bswap64(x);
@ -1029,6 +1031,42 @@ void tcg_optimize(TCGContext *s)
}
break;
CASE_OP_32_64(bswap16):
mask = arg_info(op->args[1])->mask;
if (mask <= 0xffff) {
op->args[2] |= TCG_BSWAP_IZ;
}
mask = bswap16(mask);
switch (op->args[2] & (TCG_BSWAP_OZ | TCG_BSWAP_OS)) {
case TCG_BSWAP_OZ:
break;
case TCG_BSWAP_OS:
mask = (int16_t)mask;
break;
default: /* undefined high bits */
mask |= MAKE_64BIT_MASK(16, 48);
break;
}
break;
case INDEX_op_bswap32_i64:
mask = arg_info(op->args[1])->mask;
if (mask <= 0xffffffffu) {
op->args[2] |= TCG_BSWAP_IZ;
}
mask = bswap32(mask);
switch (op->args[2] & (TCG_BSWAP_OZ | TCG_BSWAP_OS)) {
case TCG_BSWAP_OZ:
break;
case TCG_BSWAP_OS:
mask = (int32_t)mask;
break;
default: /* undefined high bits */
mask |= MAKE_64BIT_MASK(32, 32);
break;
}
break;
default:
break;
}
@ -1135,9 +1173,6 @@ void tcg_optimize(TCGContext *s)
CASE_OP_32_64(ext16s):
CASE_OP_32_64(ext16u):
CASE_OP_32_64(ctpop):
CASE_OP_32_64(bswap16):
CASE_OP_32_64(bswap32):
case INDEX_op_bswap64_i64:
case INDEX_op_ext32s_i64:
case INDEX_op_ext32u_i64:
case INDEX_op_ext_i32_i64:
@ -1151,6 +1186,17 @@ void tcg_optimize(TCGContext *s)
}
goto do_default;
CASE_OP_32_64(bswap16):
CASE_OP_32_64(bswap32):
case INDEX_op_bswap64_i64:
if (arg_is_const(op->args[1])) {
tmp = do_constant_folding(opc, arg_info(op->args[1])->val,
op->args[2]);
tcg_opt_gen_movi(s, &temps_used, op, op->args[0], tmp);
break;
}
goto do_default;
CASE_OP_32_64(add):
CASE_OP_32_64(sub):
CASE_OP_32_64(mul):