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tcg: Split trunc_shr_i32 opcode into extr[lh]_i64_i32

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Rather than allow arbitrary shift+trunc, only concern ourselves
with low and high parts.  This is all that was being used anyway.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2015-07-24 07:16:00 -07:00
parent 870ad1547a
commit 609ad70562
15 changed files with 77 additions and 59 deletions
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38
tcg/tcg-op.c
View file

@ -1737,28 +1737,28 @@ void tcg_gen_muls2_i64(TCGv_i64 rl, TCGv_i64 rh, TCGv_i64 arg1, TCGv_i64 arg2)
/* Size changing operations. */
void tcg_gen_trunc_shr_i64_i32(TCGv_i32 ret, TCGv_i64 arg, unsigned count)
void tcg_gen_extrl_i64_i32(TCGv_i32 ret, TCGv_i64 arg)
{
tcg_debug_assert(count < 64);
if (TCG_TARGET_REG_BITS == 32) {
if (count >= 32) {
tcg_gen_shri_i32(ret, TCGV_HIGH(arg), count - 32);
} else if (count == 0) {
tcg_gen_mov_i32(ret, TCGV_LOW(arg));
} else {
TCGv_i64 t = tcg_temp_new_i64();
tcg_gen_shri_i64(t, arg, count);
tcg_gen_mov_i32(ret, TCGV_LOW(t));
tcg_temp_free_i64(t);
}
} else if (TCG_TARGET_HAS_trunc_shr_i64_i32) {
tcg_gen_op3(&tcg_ctx, INDEX_op_trunc_shr_i64_i32,
GET_TCGV_I32(ret), GET_TCGV_I64(arg), count);
} else if (count == 0) {
tcg_gen_mov_i32(ret, TCGV_LOW(arg));
} else if (TCG_TARGET_HAS_extrl_i64_i32) {
tcg_gen_op2(&tcg_ctx, INDEX_op_extrl_i64_i32,
GET_TCGV_I32(ret), GET_TCGV_I64(arg));
} else {
tcg_gen_mov_i32(ret, MAKE_TCGV_I32(GET_TCGV_I64(arg)));
}
}
void tcg_gen_extrh_i64_i32(TCGv_i32 ret, TCGv_i64 arg)
{
if (TCG_TARGET_REG_BITS == 32) {
tcg_gen_mov_i32(ret, TCGV_HIGH(arg));
} else if (TCG_TARGET_HAS_extrh_i64_i32) {
tcg_gen_op2(&tcg_ctx, INDEX_op_extrh_i64_i32,
GET_TCGV_I32(ret), GET_TCGV_I64(arg));
} else {
TCGv_i64 t = tcg_temp_new_i64();
tcg_gen_shri_i64(t, arg, count);
tcg_gen_shri_i64(t, arg, 32);
tcg_gen_mov_i32(ret, MAKE_TCGV_I32(GET_TCGV_I64(t)));
tcg_temp_free_i64(t);
}
@ -1818,8 +1818,8 @@ void tcg_gen_extr_i64_i32(TCGv_i32 lo, TCGv_i32 hi, TCGv_i64 arg)
tcg_gen_mov_i32(lo, TCGV_LOW(arg));
tcg_gen_mov_i32(hi, TCGV_HIGH(arg));
} else {
tcg_gen_trunc_shr_i64_i32(lo, arg, 0);
tcg_gen_trunc_shr_i64_i32(hi, arg, 32);
tcg_gen_extrl_i64_i32(lo, arg);
tcg_gen_extrh_i64_i32(hi, arg);
}
}