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target/i386: Fix 32-bit AD[CO]X insns in 64-bit mode

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Failure to truncate the inputs results in garbage for the carry-out.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1373
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230115012103.3131796-1-richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Richard Henderson 2023-01-14 15:21:03 -10:00 • committed by Paolo Bonzini
parent 003ba52a8b
commit 6fbef9426b
3 changed files with 74 additions and 0 deletions
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2
target/i386/tcg/emit.c.inc
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@ -1037,6 +1037,8 @@ static void gen_ADCOX(DisasContext *s, CPUX86State *env, MemOp ot, int cc_op)
#ifdef TARGET_X86_64
case MO_32:
/* If TL is 64-bit just do everything in 64-bit arithmetic. */
tcg_gen_ext32u_tl(s->T0, s->T0);
tcg_gen_ext32u_tl(s->T1, s->T1);
tcg_gen_add_i64(s->T0, s->T0, s->T1);
tcg_gen_add_i64(s->T0, s->T0, carry_in);
tcg_gen_shri_i64(carry_out, s->T0, 32);