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tcg: Fix do_nonatomic_op_* vs signed operations
The smin/smax/umin/umax operations require the operands to be properly sign extended. Do not drop the MO_SIGN bit from the load, and additionally extend the val input. Backports commit 852f933e482518797f7785a2e017a215b88df815 from qemu
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@ -3201,8 +3201,9 @@ static void do_nonatomic_op_i32(TCGContext *s,
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memop = tcg_canonicalize_memop(memop, 0, 0);
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tcg_gen_qemu_ld_i32(s->uc, t1, addr, idx, memop & ~MO_SIGN);
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gen(s, t2, t1, val);
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tcg_gen_qemu_ld_i32(s->uc, t1, addr, idx, memop);
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tcg_gen_ext_i32(s, t2, val, memop);
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gen(s, t2, t1, t2);
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tcg_gen_qemu_st_i32(s->uc, t2, addr, idx, memop);
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tcg_gen_ext_i32(s, ret, (new_val ? t2 : t1), memop);
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@ -3246,8 +3247,9 @@ static void do_nonatomic_op_i64(TCGContext *s,
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memop = tcg_canonicalize_memop(memop, 1, 0);
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tcg_gen_qemu_ld_i64(s->uc, t1, addr, idx, memop & ~MO_SIGN);
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gen(s, t2, t1, val);
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tcg_gen_qemu_ld_i64(s->uc, t1, addr, idx, memop);
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tcg_gen_ext_i64(s, t2, val, memop);
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gen(s, t2, t1, t2);
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tcg_gen_qemu_st_i64(s->uc, t2, addr, idx, memop);
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tcg_gen_ext_i64(s, ret, (new_val ? t2 : t1), memop);
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