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* [gcc r12-7664] Some minor HONOR_NANS improvements to match.pd
@ 2022-03-16 9:26 Roger Sayle
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From: Roger Sayle @ 2022-03-16 9:26 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:7690bee9f36ee02b7ad0b8a7e7a3e08357890dc0
commit r12-7664-g7690bee9f36ee02b7ad0b8a7e7a3e08357890dc0
Author: Roger Sayle <roger@nextmovesoftware.com>
Date: Wed Mar 16 09:25:34 2022 +0000
Some minor HONOR_NANS improvements to match.pd
Tweak the constant folding of X CMP X in when X can't be a NaN.
2022-03-16 Roger Sayle <roger@nextmovesoftware.com>
gcc/ChangeLog
* match.pd (X CMP X -> true): Test tree_expr_maybe_nan_p
instead of HONOR_NANS.
(X LTGT X -> false): Enable if X is not tree_expr_maybe_nan_p, as
this can't trap/signal.
Diff:
---
gcc/match.pd | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/gcc/match.pd b/gcc/match.pd
index 7d619f4c932..6d691d302b3 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -4743,7 +4743,7 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
(simplify
(cmp @0 @0)
(if (! FLOAT_TYPE_P (TREE_TYPE (@0))
- || ! HONOR_NANS (@0))
+ || ! tree_expr_maybe_nan_p (@0))
{ constant_boolean_node (true, type); }
(if (cmp != EQ_EXPR
/* With -ftrapping-math conversion to EQ loses an exception. */
@@ -4755,7 +4755,7 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
(cmp @0 @0)
(if (cmp != NE_EXPR
|| ! FLOAT_TYPE_P (TREE_TYPE (@0))
- || ! HONOR_NANS (@0))
+ || ! tree_expr_maybe_nan_p (@0))
{ constant_boolean_node (false, type); })))
(for cmp (unle unge uneq)
(simplify
@@ -4767,7 +4767,7 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
(unordered @0 @0)))
(simplify
(ltgt @0 @0)
- (if (!flag_trapping_math)
+ (if (!flag_trapping_math || !tree_expr_maybe_nan_p (@0))
{ constant_boolean_node (false, type); }))
/* x == ~x -> false */
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