Ok
On Thu, Apr 27, 2023, 15:30 Jakub Jelinek <ja...@redhat.com> wrote:
> Hi!
>
> The following patch adds sqrt support (but similarly to sincos, only
> dumb basic ranges only).
>
> Ok for trunk if it passes bootstrap/regtest?
>
> Will improve this incrementally and sin/cos as well.
>
> 2023-04-27 Jakub Jelinek <ja...@redhat.com>
>
> * gimple-range-op.cc (class cfn_sqrt): New type.
> (op_cfn_sqrt): New variable.
> (gimple_range_op_handler::maybe_builtin_call): Handle
> CASE_CFN_SQRT{,_FN}.
>
> * gcc.dg/tree-ssa/range-sqrt.c: New test.
>
> --- gcc/gimple-range-op.cc.jj 2023-04-27 11:57:09.865879982 +0200
> +++ gcc/gimple-range-op.cc 2023-04-27 15:15:05.089787859 +0200
> @@ -400,6 +400,83 @@ public:
> }
> } op_cfn_copysign;
>
> +class cfn_sqrt : public range_operator_float
> +{
> +public:
> + using range_operator_float::fold_range;
> + using range_operator_float::op1_range;
> + virtual bool fold_range (frange &r, tree type,
> + const frange &lh, const frange &,
> + relation_trio) const final override
> + {
> + if (lh.undefined_p ())
> + return false;
> + if (lh.known_isnan () || real_less (&lh.upper_bound (), &dconstm0))
> + {
> + r.set_nan (type);
> + return true;
> + }
> + unsigned bulps
> + = targetm.libm_function_max_error (CFN_SQRT, TYPE_MODE (type),
> true);
> + if (bulps == ~0U)
> + r.set_varying (type);
> + else if (bulps == 0)
> + r.set (type, dconstm0, dconstinf);
> + else
> + {
> + REAL_VALUE_TYPE boundmin = dconstm0;
> + while (bulps--)
> + frange_nextafter (TYPE_MODE (type), boundmin, dconstninf);
> + r.set (type, boundmin, dconstinf);
> + }
> + if (!lh.maybe_isnan () && !real_less (&lh.lower_bound (), &dconst0))
> + r.clear_nan ();
> + return true;
> + }
> + virtual bool op1_range (frange &r, tree type,
> + const frange &lhs, const frange &,
> + relation_trio) const final override
> + {
> + if (lhs.undefined_p ())
> + return false;
> +
> + // A known NAN means the input is [-INF,-0.) U +-NAN.
> + if (lhs.known_isnan ())
> + {
> + known_nan:
> + REAL_VALUE_TYPE ub = dconstm0;
> + frange_nextafter (TYPE_MODE (type), ub, dconstninf);
> + r.set (type, dconstninf, ub);
> + // No r.flush_denormals_to_zero (); here - it is a reverse op.
> + return true;
> + }
> +
> + // Results outside of [-0.0, +Inf] are impossible.
> + const REAL_VALUE_TYPE &ub = lhs.upper_bound ();
> + if (real_less (&ub, &dconstm0))
> + {
> + if (!lhs.maybe_isnan ())
> + r.set_undefined ();
> + else
> + // If lhs could be NAN and finite result is impossible,
> + // the range is like lhs.known_isnan () above.
> + goto known_nan;
> + return true;
> + }
> +
> + if (!lhs.maybe_isnan ())
> + {
> + // If NAN is not valid result, the input cannot include either
> + // a NAN nor values smaller than -0.
> + r.set (type, dconstm0, dconstinf, nan_state (false, false));
> + return true;
> + }
> +
> + r.set_varying (type);
> + return true;
> + }
> +} op_cfn_sqrt;
> +
> class cfn_sincos : public range_operator_float
> {
> public:
> @@ -961,6 +1038,13 @@ gimple_range_op_handler::maybe_builtin_c
> m_valid = true;
> break;
>
> + CASE_CFN_SQRT:
> + CASE_CFN_SQRT_FN:
> + m_op1 = gimple_call_arg (call, 0);
> + m_float = &op_cfn_sqrt;
> + m_valid = true;
> + break;
> +
> CASE_CFN_SIN:
> CASE_CFN_SIN_FN:
> m_op1 = gimple_call_arg (call, 0);
> --- gcc/testsuite/gcc.dg/tree-ssa/range-sqrt.c.jj 2023-04-27
> 15:10:09.285102144 +0200
> +++ gcc/testsuite/gcc.dg/tree-ssa/range-sqrt.c 2023-04-27
> 15:12:01.478465821 +0200
> @@ -0,0 +1,41 @@
> +// { dg-do compile }
> +// { dg-options "-O2 -fdump-tree-evrp -fno-thread-jumps" }
> +
> +#include <math.h>
> +
> +void use (double);
> +void link_error ();
> +
> +void
> +foo (double x)
> +{
> + if (__builtin_isnan (x))
> + __builtin_unreachable ();
> + x = sqrt (x);
> + if (x < -0.0)
> + link_error ();
> + use (x);
> +}
> +
> +void
> +bar (double x)
> +{
> + if (!__builtin_isnan (sqrt (x)))
> + {
> + if (__builtin_isnan (x))
> + link_error ();
> + if (x < -0.0)
> + link_error ();
> + }
> +}
> +
> +void
> +stool (double x)
> +{
> + double res1 = sqrt (x);
> + double res2 = __builtin_sqrt (x);
> + if (res1 < -0.0 || res2 < -0.0)
> + link_error ();
> +}
> +
> +// { dg-final { scan-tree-dump-not "link_error" "evrp" { target { {
> *-*-linux* } && { glibc } } } } }
>
> Jakub
>
>
