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s390x/tcg: Factor out gen_addi_and_wrap_i64() from get_address()

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Also properly wrap in 24bit mode. While at it, convert the comment (and
drop the comment about fundamental TCG optimizations).

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20190225200318.16102-6-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2019-02-25 21:03:16 +01:00 committed by Cornelia Huck
parent 27197fec12
commit 2a1cf84452
1 changed files with 26 additions and 15 deletions
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41
target/s390x/translate.c
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@ -382,32 +382,43 @@ static inline void gen_trap(DisasContext *s)
gen_data_exception(0xff);
}
static void gen_addi_and_wrap_i64(DisasContext *s, TCGv_i64 dst, TCGv_i64 src,
int64_t imm)
{
tcg_gen_addi_i64(dst, src, imm);
if (!(s->base.tb->flags & FLAG_MASK_64)) {
if (s->base.tb->flags & FLAG_MASK_32) {
tcg_gen_andi_i64(dst, dst, 0x7fffffff);
} else {
tcg_gen_andi_i64(dst, dst, 0x00ffffff);
}
}
}
static TCGv_i64 get_address(DisasContext *s, int x2, int b2, int d2)
{
TCGv_i64 tmp = tcg_temp_new_i64();
bool need_31 = !(s->base.tb->flags & FLAG_MASK_64);
/* Note that d2 is limited to 20 bits, signed. If we crop negative
displacements early we create larger immedate addends. */
/* Note that addi optimizes the imm==0 case. */
/*
* Note that d2 is limited to 20 bits, signed. If we crop negative
* displacements early we create larger immedate addends.
*/
if (b2 && x2) {
tcg_gen_add_i64(tmp, regs[b2], regs[x2]);
tcg_gen_addi_i64(tmp, tmp, d2);
gen_addi_and_wrap_i64(s, tmp, tmp, d2);
} else if (b2) {
tcg_gen_addi_i64(tmp, regs[b2], d2);
gen_addi_and_wrap_i64(s, tmp, regs[b2], d2);
} else if (x2) {
tcg_gen_addi_i64(tmp, regs[x2], d2);
} else {
if (need_31) {
d2 &= 0x7fffffff;
need_31 = false;
gen_addi_and_wrap_i64(s, tmp, regs[x2], d2);
} else if (!(s->base.tb->flags & FLAG_MASK_64)) {
if (s->base.tb->flags & FLAG_MASK_32) {
tcg_gen_movi_i64(tmp, d2 & 0x7fffffff);
} else {
tcg_gen_movi_i64(tmp, d2 & 0x00ffffff);
}
} else {
tcg_gen_movi_i64(tmp, d2);
}
if (need_31) {
tcg_gen_andi_i64(tmp, tmp, 0x7fffffff);
}
return tmp;
}