On Wed, Jun 24, 2026 at 2:41 AM <[email protected]> wrote: > > From: Pan Li <[email protected]> > > This patch would like to try to match the the unsigned > SAT_MUL form 14, aka below > > #define DEF_SAT_U_MUL_FMT_14(NT, WT) \ > NT __attribute__((noinline)) \ > sat_u_mul_##NT##_from_##WT##_fmt_14 (NT a, NT b) \ > { \ > WT x = (WT)a * (WT)b; \ > NT hi = x >> (sizeof(NT) * 8); \ > NT lo = (NT)x; \ > return hi == 0 ? lo : -1; \ > } > > while WT is uint128_t, uint64_t, uint32_t and uint16_t, and > NT is uint64_t, uint32_t, uint16_t or uint8_t.
OK. Thanks, Richard. > gcc/ChangeLog: > > * match-sat-alu.pd: Add pattern for unsigned scalar > SAT_MUL form 14. > > Signed-off-by: Pan Li <[email protected]> > --- > gcc/match-sat-alu.pd | 24 ++++++++++++++++++++++++ > 1 file changed, 24 insertions(+) > > diff --git a/gcc/match-sat-alu.pd b/gcc/match-sat-alu.pd > index 6e6fd2afda7..ede87138d49 100644 > --- a/gcc/match-sat-alu.pd > +++ b/gcc/match-sat-alu.pd > @@ -569,6 +569,30 @@ along with GCC; see the file COPYING3. If not see > bool c2_is_type_precision_p = tree_to_uhwi (@2) == prec; > } > (if (c2_is_type_precision_p))))) > + (match (unsigned_integer_sat_mul @0 @1) > + /* SAT_U_MUL (X, Y) = { > + WT x = (WT)a * (WT)b; > + NT hi = x >> (sizeof(NT) * 8); > + NT lo = (NT)x; > + NT lo = (NT)x; > + return hi == 0 ? lo : -1; > + } while WT is uint128_t, uint64_t, uint32_t, uint16_t, > + and T is uint64_t, uint32_t, uint16_t, uint8_t. */ > + (convert (cond^ (eq (convert (rshift (mult:c@3 (convert @0) (convert @1)) > + INTEGER_CST@2)) > + integer_zerop) > + @3 INTEGER_CST@4)) > + (if (types_match (type, @0, @1) && tree_fits_uhwi_p (@2)) > + (with > + { > + unsigned prec = TYPE_PRECISION (type); > + unsigned widen_prec = TYPE_PRECISION (TREE_TYPE (@3)); > + wide_int max = wi::mask (prec, false, widen_prec); > + > + bool c2_is_type_prec_p = tree_to_uhwi (@2) == prec; > + bool c4_is_max_p = wi::eq_p (wi::to_wide (@4), max); > + } > + (if (c2_is_type_prec_p && c4_is_max_p))))) > (match (unsigned_integer_sat_mul @0 @1) > /* SAT_U_MUL (X, Y) = { > WT x = (WT)a * (WT)b; > -- > 2.43.0 >
