MATCH: [PR111109] Fix bit_ior(cond, cond) when comparisons are fp

The patterns that were added in r13-4620-g4d9db4bdd458, missed that
(a > b) and (a <= b) are not inverse of each other for floating point
comparisons (if NaNs are supported). Even though there was a check for
intergal types, it was only for the result of the cond rather for the
type of what is being compared. The fix is to check to see if cmp and
icmp are inverse of each other by using the invert_tree_comparison function.

OK for trunk and GCC 13 branch? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

I added the testcase to execute/ieee as it requires support for NAN.

	PR tree-optimization/111109

gcc/ChangeLog:

	* match.pd (ior(cond,cond), ior(vec_cond,vec_cond)):
	Add check to make sure cmp and icmp are inverse.

gcc/testsuite/ChangeLog:

	* gcc.c-torture/execute/ieee/fp-cmp-cond-1.c: New test.
---
 gcc/match.pd                                  | 11 ++-
 .../execute/ieee/fp-cmp-cond-1.c              | 78 +++++++++++++++++++
 2 files changed, 86 insertions(+), 3 deletions(-)
 create mode 100644 gcc/testsuite/gcc.c-torture/execute/ieee/fp-cmp-cond-1.c

On Wed, Aug 23, 2023 at 11:51 PM Andrew Pinski via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
> The patterns that were added in r13-4620-g4d9db4bdd458, missed that
> (a > b) and (a <= b) are not inverse of each other for floating point
> comparisons (if NaNs are supported). Even though there was a check for
> intergal types, it was only for the result of the cond rather for the
> type of what is being compared. The fix is to check to see if cmp and
> icmp are inverse of each other by using the invert_tree_comparison function.
>
> OK for trunk and GCC 13 branch? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

OK.

Thanks,
Richard.

> I added the testcase to execute/ieee as it requires support for NAN.
>
>         PR tree-optimization/111109
>
> gcc/ChangeLog:
>
>         * match.pd (ior(cond,cond), ior(vec_cond,vec_cond)):
>         Add check to make sure cmp and icmp are inverse.
>
> gcc/testsuite/ChangeLog:
>
>         * gcc.c-torture/execute/ieee/fp-cmp-cond-1.c: New test.
> ---
>  gcc/match.pd                                  | 11 ++-
>  .../execute/ieee/fp-cmp-cond-1.c              | 78 +++++++++++++++++++
>  2 files changed, 86 insertions(+), 3 deletions(-)
>  create mode 100644 gcc/testsuite/gcc.c-torture/execute/ieee/fp-cmp-cond-1.c
>
> diff --git a/gcc/match.pd b/gcc/match.pd
> index 85b7d323a19..b666d73b189 100644
> --- a/gcc/match.pd
> +++ b/gcc/match.pd
> @@ -2087,6 +2087,7 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
>     (bit_and:c (convert? (cmp@0  @01 @02)) @3)
>     (bit_and:c (convert? (icmp@4 @01 @02)) @5))
>      (if (INTEGRAL_TYPE_P (type)
> +        && invert_tree_comparison (cmp, HONOR_NANS (@01)) == icmp
>          /* The scalar version has to be canonicalized after vectorization
>             because it makes unconditional loads conditional ones, which
>             means we lose vectorization because the loads may trap.  */
> @@ -2101,6 +2102,7 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
>     (cond (cmp@0  @01 @02) @3 zerop)
>     (cond (icmp@4 @01 @02) @5 zerop))
>      (if (INTEGRAL_TYPE_P (type)
> +        && invert_tree_comparison (cmp, HONOR_NANS (@01)) == icmp
>          /* The scalar version has to be canonicalized after vectorization
>             because it makes unconditional loads conditional ones, which
>             means we lose vectorization because the loads may trap.  */
> @@ -2113,13 +2115,15 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
>    (bit_ior
>     (bit_and:c (vec_cond:s (cmp@0 @6 @7) @4 @5) @2)
>     (bit_and:c (vec_cond:s (icmp@1 @6 @7) @4 @5) @3))
> -    (if (integer_zerop (@5))
> +    (if (integer_zerop (@5)
> +        && invert_tree_comparison (cmp, HONOR_NANS (@6)) == icmp)
>       (switch
>        (if (integer_onep (@4))
>         (bit_and (vec_cond @0 @2 @3) @4))
>         (if (integer_minus_onep (@4))
>          (vec_cond @0 @2 @3)))
> -    (if (integer_zerop (@4))
> +    (if (integer_zerop (@4)
> +        && invert_tree_comparison (cmp, HONOR_NANS (@6)) == icmp)
>       (switch
>        (if (integer_onep (@5))
>         (bit_and (vec_cond @0 @3 @2) @5))
> @@ -2132,7 +2136,8 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
>    (bit_ior
>     (vec_cond:s (cmp@0 @4 @5) @2 integer_zerop)
>     (vec_cond:s (icmp@1 @4 @5) @3 integer_zerop))
> -    (vec_cond @0 @2 @3)))
> +  (if (invert_tree_comparison (cmp, HONOR_NANS (@4)) == icmp)
> +   (vec_cond @0 @2 @3))))
>
>  /* Transform X & -Y into X * Y when Y is { 0 or 1 }.  */
>  (simplify
> diff --git a/gcc/testsuite/gcc.c-torture/execute/ieee/fp-cmp-cond-1.c b/gcc/testsuite/gcc.c-torture/execute/ieee/fp-cmp-cond-1.c
> new file mode 100644
> index 00000000000..4a3c4b0eee2
> --- /dev/null
> +++ b/gcc/testsuite/gcc.c-torture/execute/ieee/fp-cmp-cond-1.c
> @@ -0,0 +1,78 @@
> +/* PR tree-optimization/111109 */
> +
> +/*
> +   f should return 0 if either fa and fb are a nan.
> +   Rather than the value of a or b.
> +*/
> +__attribute__((noipa))
> +int f(int a, int b, float fa, float fb) {
> +  const _Bool c = fa < fb;
> +  const _Bool c1 = fa >= fb;
> +  return (c * a) | (c1 * b);
> +}
> +
> +/*
> +   f1 should return 0 if either fa and fb are a nan.
> +   Rather than the value of a&1 or b&1.
> +*/
> +__attribute__((noipa))
> +int f1(int a, int b, float fa, float fb) {
> +  const _Bool c = fa < fb;
> +  const _Bool c1 = fa >= fb;
> +  return (c & a) | (c1 & b);
> +}
> +
> +#if __SIZEOF_INT__ == __SIZEOF_FLOAT__
> +typedef int v4si __attribute__ ((vector_size (1*sizeof(int))));
> +typedef float v4sf __attribute__ ((vector_size (1*sizeof(float))));
> +/*
> +   fvf0 should return {0} if either fa and fb are a nan.
> +   Rather than the value of a or b.
> +*/
> +__attribute__((noipa))
> +v4si vf0(v4si a, v4si b, v4sf fa, v4sf fb) {
> +  const v4si c = fa < fb;
> +  const v4si c1 = fa >= fb;
> +  return (c & a) | (c1 & b);
> +}
> +
> +
> +#endif
> +
> +int main(void)
> +{
> +  float a = __builtin_nan("");
> +
> +  if (f(-1,-1, a, a) != 0)
> +    __builtin_abort();
> +  if (f(-1,-1, a, 0) != 0)
> +    __builtin_abort();
> +  if (f(-1,-1, 0, a) != 0)
> +    __builtin_abort();
> +  if (f(-1,-1, 0, 0) != -1)
> +    __builtin_abort();
> +
> +
> +  if (f1(1,1, a, a) != 0)
> +    __builtin_abort();
> +  if (f1(1,1, a, 0) != 0)
> +    __builtin_abort();
> +  if (f1(1,1, 0, a) != 0)
> +    __builtin_abort();
> +  if (f1(1,1, 0, 0) != 1)
> +        __builtin_abort();
> +
> +#if __SIZEOF_INT__ == __SIZEOF_FLOAT__
> +  v4si b = {-1};
> +  v4sf c = {a};
> +  v4sf d = {0.0};
> +  if (vf0(b,b, c, c)[0] != 0)
> +    __builtin_abort();
> +  if (vf0(b,b, c, d)[0] != 0)
> +    __builtin_abort();
> +  if (vf0(b,b, d, c)[0] != 0)
> +    __builtin_abort();
> +  if (vf0(b,b, d, d)[0] != b[0])
> +        __builtin_abort();
> +#endif
> +}
> --
> 2.31.1
>