On 6/14/21 10:37 AM, Richard Henderson wrote:
> Implement the new semantics in the fallback expansion.
> Change all callers to supply the flags that keep the
> semantics unchanged locally.
>
> Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
> ---
> include/tcg/tcg-op.h | 8 +--
> target/arm/translate-a64.c | 12 ++--
> target/arm/translate.c | 2 +-
> target/i386/tcg/translate.c | 2 +-
> target/mips/tcg/mxu_translate.c | 2 +-
> target/s390x/translate.c | 4 +-
> target/sh4/translate.c | 2 +-
Various REV 16/32, would it be useful to have it as a TCG opcode?
> tcg/tcg-op.c | 121 ++++++++++++++++++++++----------
> 8 files changed, 99 insertions(+), 54 deletions(-)
> } else {
> TCGv_i64 t0 = tcg_temp_new_i64();
> TCGv_i64 t1 = tcg_temp_new_i64();
> TCGv_i64 t2 = tcg_constant_i64(0x00ff00ff);
>
> - /* arg = ....abcd */
> - tcg_gen_shri_i64(t0, arg, 8); /* t0 = .....abc */
> - tcg_gen_and_i64(t1, arg, t2); /* t1 = .....b.d */
> - tcg_gen_and_i64(t0, t0, t2); /* t0 = .....a.c */
> - tcg_gen_shli_i64(t1, t1, 8); /* t1 = ....b.d. */
> - tcg_gen_or_i64(ret, t0, t1); /* ret = ....badc */
> + /* arg = xxxxabcd */
> + tcg_gen_shri_i64(t0, arg, 8); /* t0 = .xxxxabc */
> + tcg_gen_and_i64(t1, arg, t2); /* t1 = .....b.d */
> + tcg_gen_and_i64(t0, t0, t2); /* t0 = .....a.c */
> + tcg_gen_shli_i64(t1, t1, 8); /* t1 = ....b.d. */
> + tcg_gen_or_i64(ret, t0, t1); /* ret = ....badc */
>
> - tcg_gen_shli_i64(t1, ret, 48); /* t1 = dc...... */
> - tcg_gen_shri_i64(t0, ret, 16); /* t0 = ......ba */
> - tcg_gen_shri_i64(t1, t1, 32); /* t1 = ....dc.. */
> - tcg_gen_or_i64(ret, t0, t1); /* ret = ....dcba */
> + tcg_gen_shli_i64(t1, ret, 48); /* t1 = dc...... */
> + tcg_gen_shri_i64(t0, ret, 16); /* t0 = ......ba */
> + if (flags & TCG_BSWAP_OS) {
> + tcg_gen_sari_i64(t1, t1, 32); /* t1 = ssssdc.. */
> + } else {
> + tcg_gen_shri_i64(t1, t1, 32); /* t1 = ....dc.. */
> + }
> + tcg_gen_or_i64(ret, t0, t1); /* ret = ssssdcba */
Comment update appreciated, thanks.
Reviewed-by: Philippe Mathieu-Daudé <f4...@amsat.org>
