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target/arm: Use tcg_gen_rotri_i32 for gen_swap_half 

Rotate is the more compact and obvious way to swap 16-bit
elements of a 32-bit word.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20190808202616.13782-6-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2019-08-08 13:26:14 -07:00 committed by Peter Maydell
parent dd861b3f29
commit adefba76e8
1 changed files with 1 additions and 5 deletions
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6
target/arm/translate.c
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@ -444,11 +444,7 @@ static TCGv_i64 gen_muls_i64_i32(TCGv_i32 a, TCGv_i32 b)
/* Swap low and high halfwords. */
static void gen_swap_half(TCGv_i32 var)
{
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_shri_i32(tmp, var, 16);
tcg_gen_shli_i32(var, var, 16);
tcg_gen_or_i32(var, var, tmp);
tcg_temp_free_i32(tmp);
tcg_gen_rotri_i32(var, var, 16);
}
/* Dual 16-bit add. Result placed in t0 and t1 is marked as dead.