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Add MIN/MAX folding from fold_cond_expr_with_comparison to match.pd 

The following adds MIN/MAX folding from fold_cond_expr_with_comparison
to the part GIMPLE of match.pd, leaving the GENERIC part in
fold-const.cc since that's constrainted on frontend specific things
I did not want to carry to match.pd.

The effect becomes appearant when we no longer can rely on GENERIC
folding of COND_EXPRs in gcc.dg/tree-ssa/pr92834.c and
gcc.dg/tree-ssa/pr94786.c.

2022-05-13  Richard Biener  <rguenther@suse.de>

	* match.pd (A cmp B ? A : B -> min/max): New patterns
	carried over from fold_cond_expr_with_comparison.
This commit is contained in:
Richard Biener 2022-05-13 09:35:30 +02:00
parent 69c4b5c519
commit 9a53101caa
1 changed files with 46 additions and 0 deletions
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gcc/match.pd
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@ -4450,6 +4450,52 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
(op (min @X { wide_int_to_tree (from_type, real_c1); })
{ wide_int_to_tree (from_type, c2); })))))))))
#if GIMPLE
/* A >= B ? A : B -> max (A, B) and friends. The code is still
in fold_cond_expr_with_comparison for GENERIC folding with
some extra constraints. */
(for cmp (eq ne le lt unle unlt ge gt unge ungt uneq ltgt)
(simplify
(cond (cmp:c (nop_convert1?@c0 @0) (nop_convert2?@c1 @1))
(convert3? @0) (convert4? @1))
(if (!HONOR_SIGNED_ZEROS (type)
&& ((INTEGRAL_TYPE_P (type)
/* Allow widening conversions of the data. */
&& TYPE_PRECISION (TREE_TYPE (@0)) <= TYPE_PRECISION (type)
&& TYPE_PRECISION (TREE_TYPE (@1)) <= TYPE_PRECISION (type))
|| (tree_nop_conversion_p (type, TREE_TYPE (@0))
&& tree_nop_conversion_p (type, TREE_TYPE (@1)))))
(switch
(if (cmp == EQ_EXPR)
(if (VECTOR_TYPE_P (type))
(view_convert @c1)
(convert @c1)))
(if (cmp == NE_EXPR)
(if (VECTOR_TYPE_P (type))
(view_convert @c0)
(convert @c0)))
(if (cmp == LE_EXPR || cmp == UNLE_EXPR || cmp == LT_EXPR || cmp == UNLT_EXPR)
(if (!HONOR_NANS (type))
(if (VECTOR_TYPE_P (type))
(view_convert (min @c0 @c1))
(convert (min @c0 @c1)))))
(if (cmp == GE_EXPR || cmp == UNGE_EXPR || cmp == GT_EXPR || cmp == UNGT_EXPR)
(if (!HONOR_NANS (type))
(if (VECTOR_TYPE_P (type))
(view_convert (max @c0 @c1))
(convert (max @c0 @c1)))))
(if (cmp == UNEQ_EXPR)
(if (!HONOR_NANS (type))
(if (VECTOR_TYPE_P (type))
(view_convert @c1)
(convert @c1))))
(if (cmp == LTGT_EXPR)
(if (!HONOR_NANS (type))
(if (VECTOR_TYPE_P (type))
(view_convert @c0)
(convert @c0))))))))
#endif
/* X != C1 ? -X : C2 simplifies to -X when -C1 == C2. */
(simplify
(cond (ne @0 INTEGER_CST@1) (negate@3 @0) INTEGER_CST@2)