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target/arm: Fix sign-extension for SMLAL* 

The 32-bit product should be sign-extended, not zero-extended.

Fixes: ea96b37464
Reported-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Message-id: 20190912183058.17947-1-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2019-10-22 16:50:35 +01:00 committed by Peter Maydell
parent f9bec78137
commit 1ab1708652
1 changed files with 3 additions and 1 deletions
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4
target/arm/translate.c
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@ -8045,7 +8045,9 @@ static bool op_smlaxxx(DisasContext *s, arg_rrrr *a,
case 2:
tl = load_reg(s, a->ra);
th = load_reg(s, a->rd);
t1 = tcg_const_i32(0);
/* Sign-extend the 32-bit product to 64 bits. */
t1 = tcg_temp_new_i32();
tcg_gen_sari_i32(t1, t0, 31);
tcg_gen_add2_i32(tl, th, tl, th, t0, t1);
tcg_temp_free_i32(t0);
tcg_temp_free_i32(t1);