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The TCG IR sequence: mov_i32 tmp97,$0xc4240000 dead: 1 pref=3D0xffffffff mov_i32 tmp98,$0x0 pref=3D0xffffffff rotr_i32 tmp97,tmp97,tmp98 dead: 1 2 pref=3D0xffffffff was translated to `slwi r15, r14, 0` instead of `slwi r14, r14, 0` due to S= H field overflow. SH field is 5 bits, and tcg_out_rlw is called in some situations with `32-n= `, when `n` is 0 it results in an overflow to RA field. This commit prevents overflow of that field and adds debug assertions for t= he other fields Acked-by: Ilya Leoshkevich Signed-off-by: Dani Szebenyi Reviewed-by: Richard Henderson --- tcg/ppc/tcg-target.c.inc | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tcg/ppc/tcg-target.c.inc b/tcg/ppc/tcg-target.c.inc index 223f079524..9a11c26fd3 100644 --- a/tcg/ppc/tcg-target.c.inc +++ b/tcg/ppc/tcg-target.c.inc @@ -911,7 +911,9 @@ static void tcg_out_rld(TCGContext *s, int op, TCGReg r= a, TCGReg rs, static void tcg_out_rlw_rc(TCGContext *s, int op, TCGReg ra, TCGReg rs, int sh, int mb, int me, bool rc) { - tcg_out32(s, op | RA(ra) | RS(rs) | SH(sh) | MB(mb) | ME(me) | rc); + tcg_debug_assert((mb & 0x1f) =3D=3D mb); + tcg_debug_assert((me & 0x1f) =3D=3D me); + tcg_out32(s, op | RA(ra) | RS(rs) | SH(sh & 0x1f) | MB(mb) | ME(me) | = rc); } =20 static void tcg_out_rlw(TCGContext *s, int op, TCGReg ra, TCGReg rs, --=20 2.47.0