mirror of https://gitee.com/openkylin/qemu.git
Support saturation with shift=0.
This patch fixes corner-case saturations, when the target range is zero. It merely removes the guard against (sh == 0), and makes: __ssat(0x87654321, 1) return 0xffffffff and set the saturation flag __usat(0x87654321, 0) return 0 and set the saturation flag Signed-off-by: Christophe Lyon <christophe.lyon@st.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
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@ -6888,27 +6888,23 @@ static void disas_arm_insn(CPUState * env, DisasContext *s)
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tcg_gen_shli_i32(tmp, tmp, shift);
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}
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sh = (insn >> 16) & 0x1f;
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if (sh != 0) {
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tmp2 = tcg_const_i32(sh);
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if (insn & (1 << 22))
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gen_helper_usat(tmp, tmp, tmp2);
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else
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gen_helper_ssat(tmp, tmp, tmp2);
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tcg_temp_free_i32(tmp2);
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}
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tmp2 = tcg_const_i32(sh);
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if (insn & (1 << 22))
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gen_helper_usat(tmp, tmp, tmp2);
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else
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gen_helper_ssat(tmp, tmp, tmp2);
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tcg_temp_free_i32(tmp2);
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store_reg(s, rd, tmp);
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} else if ((insn & 0x00300fe0) == 0x00200f20) {
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/* [us]sat16 */
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tmp = load_reg(s, rm);
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sh = (insn >> 16) & 0x1f;
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if (sh != 0) {
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tmp2 = tcg_const_i32(sh);
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if (insn & (1 << 22))
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gen_helper_usat16(tmp, tmp, tmp2);
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else
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gen_helper_ssat16(tmp, tmp, tmp2);
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tcg_temp_free_i32(tmp2);
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}
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tmp2 = tcg_const_i32(sh);
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if (insn & (1 << 22))
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gen_helper_usat16(tmp, tmp, tmp2);
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else
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gen_helper_ssat16(tmp, tmp, tmp2);
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tcg_temp_free_i32(tmp2);
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store_reg(s, rd, tmp);
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} else if ((insn & 0x00700fe0) == 0x00000fa0) {
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/* Select bytes. */
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