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tcg: Clean up generic bswap32

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Based on the only current user, Sparc:

New code uses 1 constant that takes 2 insns to create, plus 8.
Old code used 2 constants that took 2 insns to create, plus 9.
The result is a new total of 10 vs an old total of 13.

Backports commit a686dc71d89b1d7934becd95c843aa1375cdb7e7 from qemu
This commit is contained in:
Richard Henderson 2018-12-18 05:46:24 -05:00 committed by Lioncash
parent 3b85c29bb9
commit f68b4aa896
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GPG Key ID: 4E3C3CC1031BA9C7
1 changed files with 27 additions and 27 deletions
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54
qemu/tcg/tcg-op.c
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@ -1019,24 +1019,24 @@ void tcg_gen_bswap32_i32(TCGContext *s, TCGv_i32 ret, TCGv_i32 arg)
if (TCG_TARGET_HAS_bswap32_i32) {
tcg_gen_op2_i32(s, INDEX_op_bswap32_i32, ret, arg);
} else {
TCGv_i32 t0, t1;
t0 = tcg_temp_new_i32(s);
t1 = tcg_temp_new_i32(s);
TCGv_i32 t0 = tcg_temp_new_i32(s);
TCGv_i32 t1 = tcg_temp_new_i32(s);
TCGv_i32 t2 = tcg_const_i32(s, 0x00ff00ff);
tcg_gen_shli_i32(s, t0, arg, 24);
/* arg = abcd */
tcg_gen_shri_i32(s, t0, arg, 8); /* t0 = .abc */
tcg_gen_and_i32(s, t1, arg, t2); /* t1 = .b.d */
tcg_gen_and_i32(s, t0, t0, t2); /* t0 = .a.c */
tcg_gen_shli_i32(s, t1, t1, 8); /* t1 = b.d. */
tcg_gen_or_i32(s, ret, t0, t1); /* ret = badc */
tcg_gen_andi_i32(s, t1, arg, 0x0000ff00);
tcg_gen_shli_i32(s, t1, t1, 8);
tcg_gen_or_i32(s, t0, t0, t1);
tcg_gen_shri_i32(s, t0, ret, 16); /* t0 = ..ba */
tcg_gen_shli_i32(s, t1, ret, 16); /* t1 = dc.. */
tcg_gen_or_i32(s, ret, t0, t1); /* ret = dcba */
tcg_gen_shri_i32(s, t1, arg, 8);
tcg_gen_andi_i32(s, t1, t1, 0x0000ff00);
tcg_gen_or_i32(s, t0, t0, t1);
tcg_gen_shri_i32(s, t1, arg, 24);
tcg_gen_or_i32(s, ret, t0, t1);
tcg_temp_free_i32(s, t0);
tcg_temp_free_i32(s, t1);
tcg_temp_free_i32(s, t2);
}
}
@ -1645,25 +1645,25 @@ void tcg_gen_bswap32_i64(TCGContext *s, TCGv_i64 ret, TCGv_i64 arg)
} else if (TCG_TARGET_HAS_bswap32_i64) {
tcg_gen_op2_i64(s, INDEX_op_bswap32_i64, ret, arg);
} else {
TCGv_i64 t0, t1;
t0 = tcg_temp_new_i64(s);
t1 = tcg_temp_new_i64(s);
TCGv_i64 t0 = tcg_temp_new_i64(s);
TCGv_i64 t1 = tcg_temp_new_i64(s);
TCGv_i64 t2 = tcg_const_i64(s, 0x00ff00ff);
tcg_gen_shli_i64(s, t0, arg, 24);
tcg_gen_ext32u_i64(s, t0, t0);
/* arg = ....abcd */
tcg_gen_shri_i64(s, t0, arg, 8); /* t0 = .....abc */
tcg_gen_and_i64(s, t1, arg, t2); /* t1 = .....b.d */
tcg_gen_and_i64(s, t0, t0, t2); /* t0 = .....a.c */
tcg_gen_shli_i64(s, t1, t1, 8); /* t1 = ....b.d. */
tcg_gen_or_i64(s, ret, t0, t1); /* ret = ....badc */
tcg_gen_andi_i64(s, t1, arg, 0x0000ff00);
tcg_gen_shli_i64(s, t1, t1, 8);
tcg_gen_or_i64(s, t0, t0, t1);
tcg_gen_shli_i64(s, t1, ret, 48); /* t1 = dc...... */
tcg_gen_shri_i64(s, t0, ret, 16); /* t0 = ......ba */
tcg_gen_shri_i64(s, t1, t1, 32); /* t1 = ....dc.. */
tcg_gen_or_i64(s, ret, t0, t1); /* ret = ....dcba */
tcg_gen_shri_i64(s, t1, arg, 8);
tcg_gen_andi_i64(s, t1, t1, 0x0000ff00);
tcg_gen_or_i64(s, t0, t0, t1);
tcg_gen_shri_i64(s, t1, arg, 24);
tcg_gen_or_i64(s, ret, t0, t1);
tcg_temp_free_i64(s, t0);
tcg_temp_free_i64(s, t1);
tcg_temp_free_i64(s, t2);
}
}