diff mbox series

MATCH: Fix invalid signed boolean type usage

Message ID 20231128044326.734466-1-quic_apinski@quicinc.com
State Unresolved
Headers
Series MATCH: Fix invalid signed boolean type usage |

Checks

Context Check Description
snail/gcc-patch-check warning Git am fail log

Commit Message

Andrew Pinski (QUIC) Nov. 28, 2023, 4:43 a.m. UTC 
  This fixes the incorrect assumption that was done in r14-3721-ge6bcf839894783,
that being able to doing the negative after the conversion would be a valid thing
but really it is not valid for boolean types.

OK? Bootstrapped and tested on x86_64-linux-gnu.

gcc/ChangeLog:

	PR tree-optimization/112738
	* match.pd (`(nop_convert)-(convert)a`): Reject
	when the outer type is boolean.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>
---
 gcc/match.pd | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/gcc/match.pd b/gcc/match.pd
index 95225e4ca5f..294e58ebf44 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -1033,12 +1033,16 @@  DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
 /* (nop_outer_cast)-(inner_cast)var -> -(outer_cast)(var)
    if var is smaller in precision.
    This is always safe for both doing the negative in signed or unsigned
-   as the value for undefined will not show up.  */
+   as the value for undefined will not show up.
+   Note the outer cast cannot be a boolean type as the only valid values
+   are 0,-1/1 (depending on the signedness of the boolean) and the negative
+   is there to get the correct value.  */
 (simplify
  (convert (negate:s@1 (convert:s @0)))
  (if (INTEGRAL_TYPE_P (type)
       && tree_nop_conversion_p (type, TREE_TYPE (@1))
-      && TYPE_PRECISION (type) > TYPE_PRECISION (TREE_TYPE (@0)))
+      && TYPE_PRECISION (type) > TYPE_PRECISION (TREE_TYPE (@0))
+      && TREE_CODE (type) != BOOLEAN_TYPE)
     (negate (convert @0))))
 
 (for op (negate abs)