target/arm: optimize aarch32 rev16
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>
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@ -343,11 +343,13 @@ static void gen_smul_dual(TCGv_i32 a, TCGv_i32 b)
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static void gen_rev16(TCGv_i32 var)
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{
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TCGv_i32 tmp = tcg_temp_new_i32();
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TCGv_i32 mask = tcg_const_i32(0x00ff00ff);
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tcg_gen_shri_i32(tmp, var, 8);
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tcg_gen_andi_i32(tmp, tmp, 0x00ff00ff);
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tcg_gen_and_i32(tmp, tmp, mask);
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tcg_gen_and_i32(var, var, mask);
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tcg_gen_shli_i32(var, var, 8);
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tcg_gen_andi_i32(var, var, 0xff00ff00);
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tcg_gen_or_i32(var, var, tmp);
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tcg_temp_free_i32(mask);
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tcg_temp_free_i32(tmp);
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}
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