target/m68k: Optimize rotate_x() using extract_i32()
Optimize rotate_x() using tcg_gen_extract_i32(). We can now free the 'sz' tcg_temp earlier. Since it is allocated with tcg_const_i32(), free it with tcg_temp_free_i32(). Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20190310003428.11723-6-f4bug@amsat.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
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@ -3693,6 +3693,7 @@ static TCGv rotate_x(TCGv reg, TCGv shift, int left, int size)
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tcg_gen_sub_i32(shl, shl, shift); /* shl = size + 1 - shift */
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tcg_gen_sub_i32(shx, sz, shift); /* shx = size - shift */
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}
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tcg_temp_free_i32(sz);
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/* reg = (reg << shl) | (reg >> shr) | (x << shx); */
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@ -3708,9 +3709,7 @@ static TCGv rotate_x(TCGv reg, TCGv shift, int left, int size)
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/* X = (reg >> size) & 1 */
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X = tcg_temp_new();
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tcg_gen_shr_i32(X, reg, sz);
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tcg_gen_andi_i32(X, X, 1);
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tcg_temp_free(sz);
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tcg_gen_extract_i32(X, reg, size, 1);
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return X;
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}
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