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s390x/tcg: Fix VECTOR SUBTRACT WITH BORROW COMPUTE BORROW INDICATION

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The numbers are unsigned, the computation is wrong. "Each operand is
treated as an unsigned binary integer".
Let's implement as given in the PoP:

"A subtraction is performed by adding the contents of the second operand
 with the bitwise complement of the third operand along with a borrow
 indication from the rightmost bit of the fourth operand."

Reuse gen_accc2_i64().

Fixes: bc725e6515 ("s390x/tcg: Implement VECTOR SUBTRACT WITH BORROW COMPUTE BORROW INDICATION")
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20191021085715.3797-7-david@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2019-10-21 10:57:15 +02:00 committed by Cornelia Huck
parent 2cb8a68d37
commit 38ad4fa3de
1 changed files with 3 additions and 10 deletions
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13
target/s390x/translate_vx.inc.c
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@ -2214,20 +2214,13 @@ static void gen_sbcbi2_i64(TCGv_i64 dl, TCGv_i64 dh, TCGv_i64 al, TCGv_i64 ah,
{
TCGv_i64 th = tcg_temp_new_i64();
TCGv_i64 tl = tcg_temp_new_i64();
TCGv_i64 zero = tcg_const_i64(0);
tcg_gen_andi_i64(tl, cl, 1);
tcg_gen_sub2_i64(tl, th, al, zero, tl, zero);
tcg_gen_sub2_i64(tl, th, tl, th, bl, zero);
tcg_gen_andi_i64(th, th, 1);
tcg_gen_sub2_i64(tl, th, ah, zero, th, zero);
tcg_gen_sub2_i64(tl, th, tl, th, bh, zero);
tcg_gen_andi_i64(dl, th, 1);
tcg_gen_mov_i64(dh, zero);
tcg_gen_not_i64(tl, bl);
tcg_gen_not_i64(th, bh);
gen_accc2_i64(dl, dh, al, ah, tl, th, cl, ch);
tcg_temp_free_i64(tl);
tcg_temp_free_i64(th);
tcg_temp_free_i64(zero);
}
static DisasJumpType op_vsbcbi(DisasContext *s, DisasOps *o)