This fixes the first part of this bug where `a ? -1 : 0`
would cause a value of 1 into the signed boolean value.
It fixes the problem by casting to an integer type of
the same size/signedness before doing the negative and
then casting to the type of expression.
OK? Bootstrapped and tested on x86_64.
gcc/ChangeLog:
* match.pd (a?-1:0): Cast type an integer type
rather the type before the negative.
(a?0:-1): Likewise.
---
gcc/match.pd | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/gcc/match.pd b/gcc/match.pd
index 45c72e733a5..a0d114f6a16 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -4703,7 +4703,12 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
/* a ? -1 : 0 -> -a. No need to check the TYPE_PRECISION not being 1
here as the powerof2cst case above will handle that case correctly. */
(if (INTEGRAL_TYPE_P (type) && integer_all_onesp (@1))
- (negate (convert (convert:boolean_type_node @0))))))
+ (with {
+ auto prec = TYPE_PRECISION (type);
+ auto unsign = TYPE_UNSIGNED (type);
+ tree inttype = build_nonstandard_integer_type (prec, unsign);
+ }
+ (convert (negate (convert:inttype (convert:boolean_type_node @0))))))))
(if (integer_zerop (@1))
(with {
tree booltrue = constant_boolean_node (true, boolean_type_node);
@@ -4722,7 +4727,20 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
/* a ? -1 : 0 -> -(!a). No need to check the TYPE_PRECISION not being 1
here as the powerof2cst case above will handle that case correctly. */
(if (INTEGRAL_TYPE_P (type) && integer_all_onesp (@2))
- (negate (convert (bit_xor (convert:boolean_type_node @0) { booltrue; }
))))
+ (with {
+ auto prec = TYPE_PRECISION (type);
+ auto unsign = TYPE_UNSIGNED (type);
+ tree inttype = build_nonstandard_integer_type (prec, unsign);
+ }
+ (convert
+ (negate
+ (convert:inttype
+ (bit_xor (convert:boolean_type_node @0) { booltrue; } )
+ )
+ )
+ )
+ )
+ )
)
)
)
--
2.31.1
