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target/arm: optimize aarch32 rev16

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Use the same mask to avoid having to load two different constants, as
suggested by Richard Henderson.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-Id: <20170516230159.4195-2-aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Aurelien Jarno 2017-05-17 01:01:56 +02:00 committed by Richard Henderson
parent abb1066df3
commit 68cedf733a
1 changed files with 4 additions and 2 deletions
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6
target/arm/translate.c
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@ -343,11 +343,13 @@ static void gen_smul_dual(TCGv_i32 a, TCGv_i32 b)
static void gen_rev16(TCGv_i32 var)
{
TCGv_i32 tmp = tcg_temp_new_i32();
TCGv_i32 mask = tcg_const_i32(0x00ff00ff);
tcg_gen_shri_i32(tmp, var, 8);
tcg_gen_andi_i32(tmp, tmp, 0x00ff00ff);
tcg_gen_and_i32(tmp, tmp, mask);
tcg_gen_and_i32(var, var, mask);
tcg_gen_shli_i32(var, var, 8);
tcg_gen_andi_i32(var, var, 0xff00ff00);
tcg_gen_or_i32(var, var, tmp);
tcg_temp_free_i32(mask);
tcg_temp_free_i32(tmp);
}