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Split out handling of this optimization to a separate function, only to be called when applicable. Remove the a_mask field from OptContext, as the mask is no longer stored anywhere. Reviewed-by: Pierrick Bouvier Signed-off-by: Richard Henderson --- tcg/optimize.c | 42 +++++++++++++++++++++++++++--------------- 1 file changed, 27 insertions(+), 15 deletions(-) diff --git a/tcg/optimize.c b/tcg/optimize.c index 453e8c43bd..6757fe0036 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -64,7 +64,6 @@ typedef struct OptContext { QSIMPLEQ_HEAD(, MemCopyInfo) mem_free; =20 /* In flight values from optimization. */ - uint64_t a_mask; /* mask bit is 0 iff value identical to first input = */ uint64_t z_mask; /* mask bit is 0 iff value bit is 0 */ uint64_t s_mask; /* mask of clrsb(value) bits */ TCGType type; @@ -1047,7 +1046,6 @@ static bool fold_const2_commutative(OptContext *ctx, = TCGOp *op) =20 static bool fold_masks(OptContext *ctx, TCGOp *op) { - uint64_t a_mask =3D ctx->a_mask; uint64_t z_mask =3D ctx->z_mask; uint64_t s_mask =3D ctx->s_mask; =20 @@ -1059,7 +1057,6 @@ static bool fold_masks(OptContext *ctx, TCGOp *op) * type changing opcodes. */ if (ctx->type =3D=3D TCG_TYPE_I32) { - a_mask =3D (int32_t)a_mask; z_mask =3D (int32_t)z_mask; s_mask |=3D MAKE_64BIT_MASK(32, 32); ctx->z_mask =3D z_mask; @@ -1069,6 +1066,19 @@ static bool fold_masks(OptContext *ctx, TCGOp *op) if (z_mask =3D=3D 0) { return tcg_opt_gen_movi(ctx, op, op->args[0], 0); } + return false; +} + +/* + * An "affected" mask bit is 0 if and only if the result is identical + * to the first input. Thus if the entire mask is 0, the operation + * is equivalent to a copy. + */ +static bool fold_affected_mask(OptContext *ctx, TCGOp *op, uint64_t a_mask) +{ + if (ctx->type =3D=3D TCG_TYPE_I32) { + a_mask =3D (uint32_t)a_mask; + } if (a_mask =3D=3D 0) { return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]); } @@ -1305,8 +1315,9 @@ static bool fold_and(OptContext *ctx, TCGOp *op) * Known-zeros does not imply known-ones. Therefore unless * arg2 is constant, we can't infer affected bits from it. */ - if (arg_is_const(op->args[2])) { - ctx->a_mask =3D z1 & ~z2; + if (arg_is_const(op->args[2]) && + fold_affected_mask(ctx, op, z1 & ~z2)) { + return true; } =20 return fold_masks(ctx, op); @@ -1331,7 +1342,9 @@ static bool fold_andc(OptContext *ctx, TCGOp *op) */ if (arg_is_const(op->args[2])) { uint64_t z2 =3D ~arg_info(op->args[2])->z_mask; - ctx->a_mask =3D z1 & ~z2; + if (fold_affected_mask(ctx, op, z1 & ~z2)) { + return true; + } z1 &=3D z2; } ctx->z_mask =3D z1; @@ -1709,8 +1722,8 @@ static bool fold_extract(OptContext *ctx, TCGOp *op) =20 z_mask_old =3D arg_info(op->args[1])->z_mask; z_mask =3D extract64(z_mask_old, pos, len); - if (pos =3D=3D 0) { - ctx->a_mask =3D z_mask_old ^ z_mask; + if (pos =3D=3D 0 && fold_affected_mask(ctx, op, z_mask_old ^ z_mask)) { + return true; } ctx->z_mask =3D z_mask; ctx->s_mask =3D smask_from_zmask(z_mask); @@ -1777,8 +1790,8 @@ static bool fold_exts(OptContext *ctx, TCGOp *op) =20 ctx->z_mask =3D z_mask; ctx->s_mask =3D s_mask; - if (!type_change) { - ctx->a_mask =3D s_mask & ~s_mask_old; + if (!type_change && fold_affected_mask(ctx, op, s_mask & ~s_mask_old))= { + return true; } =20 return fold_masks(ctx, op); @@ -1819,8 +1832,8 @@ static bool fold_extu(OptContext *ctx, TCGOp *op) =20 ctx->z_mask =3D z_mask; ctx->s_mask =3D smask_from_zmask(z_mask); - if (!type_change) { - ctx->a_mask =3D z_mask_old ^ z_mask; + if (!type_change && fold_affected_mask(ctx, op, z_mask_old ^ z_mask)) { + return true; } return fold_masks(ctx, op); } @@ -2482,8 +2495,8 @@ static bool fold_sextract(OptContext *ctx, TCGOp *op) s_mask |=3D MAKE_64BIT_MASK(len, 64 - len); ctx->s_mask =3D s_mask; =20 - if (pos =3D=3D 0) { - ctx->a_mask =3D s_mask & ~s_mask_old; + if (pos =3D=3D 0 && fold_affected_mask(ctx, op, s_mask & ~s_mask_old))= { + return true; } =20 return fold_masks(ctx, op); @@ -2843,7 +2856,6 @@ void tcg_optimize(TCGContext *s) } =20 /* Assume all bits affected, no bits known zero, no sign reps. */ - ctx.a_mask =3D -1; ctx.z_mask =3D -1; ctx.s_mask =3D 0; =20 --=20 2.43.0