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tcg: Implement tcg_gen_{h,w}swap_{i32,i64}

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Swap half-words (16-bit) and words (32-bit) within a larger value.
Mirrors functions of the same names within include/qemu/bitops.h.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: David Miller <dmiller423@gmail.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-Id: <20220428094708.84835-5-david@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Richard Henderson 2022-04-28 11:46:59 +02:00 • committed by Thomas Huth
parent d98ed7d96e
commit 46be8425ff
2 changed files with 36 additions and 0 deletions
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30
tcg/tcg-op.c
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@ -1056,6 +1056,12 @@ void tcg_gen_bswap32_i32(TCGv_i32 ret, TCGv_i32 arg)
}
}
void tcg_gen_hswap_i32(TCGv_i32 ret, TCGv_i32 arg)
{
/* Swapping 2 16-bit elements is a rotate. */
tcg_gen_rotli_i32(ret, arg, 16);
}
void tcg_gen_smin_i32(TCGv_i32 ret, TCGv_i32 a, TCGv_i32 b)
{
tcg_gen_movcond_i32(TCG_COND_LT, ret, a, b, a, b);
@ -1792,6 +1798,30 @@ void tcg_gen_bswap64_i64(TCGv_i64 ret, TCGv_i64 arg)
}
}
void tcg_gen_hswap_i64(TCGv_i64 ret, TCGv_i64 arg)
{
uint64_t m = 0x0000ffff0000ffffull;
TCGv_i64 t0 = tcg_temp_new_i64();
TCGv_i64 t1 = tcg_temp_new_i64();
/* See include/qemu/bitops.h, hswap64. */
tcg_gen_rotli_i64(t1, arg, 32);
tcg_gen_andi_i64(t0, t1, m);
tcg_gen_shli_i64(t0, t0, 16);
tcg_gen_shri_i64(t1, t1, 16);
tcg_gen_andi_i64(t1, t1, m);
tcg_gen_or_i64(ret, t0, t1);
tcg_temp_free_i64(t0);
tcg_temp_free_i64(t1);
}
void tcg_gen_wswap_i64(TCGv_i64 ret, TCGv_i64 arg)
{
/* Swapping 2 32-bit elements is a rotate. */
tcg_gen_rotli_i64(ret, arg, 32);
}
void tcg_gen_not_i64(TCGv_i64 ret, TCGv_i64 arg)
{
if (TCG_TARGET_REG_BITS == 32) {