https://gcc.gnu.org/g:d88fe8210e4edc2f4ddf722ba788924452c6f6a0
commit r12-10430-gd88fe8210e4edc2f4ddf722ba788924452c6f6a0
Author: Andrew Pinski <quic_apin...@quicinc.com>
Date: Sun Mar 10 22:17:09 2024 +0000
Fold: Fix up merge_truthop_with_opposite_arm for NaNs [PR95351]
The problem here is that merge_truthop_with_opposite_arm would
use the type of the result of the comparison rather than the operands
of the comparison to figure out if we are honoring NaNs.
This fixes that oversight and now we get the correct results in this
case.
Committed as obvious after a bootstrap/test on x86_64-linux-gnu.
PR middle-end/95351
gcc/ChangeLog:
* fold-const.cc (merge_truthop_with_opposite_arm): Use
the type of the operands of the comparison and not the type
of the comparison.
gcc/testsuite/ChangeLog:
* gcc.dg/float_opposite_arm-1.c: New test.
Signed-off-by: Andrew Pinski <quic_apin...@quicinc.com>
(cherry picked from commit 31ce2e993d09dcad1ce139a2848a28de5931056d)
Diff:
---
gcc/fold-const.cc | 3 ++-
gcc/testsuite/gcc.dg/float_opposite_arm-1.c | 17 +++++++++++++++++
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/gcc/fold-const.cc b/gcc/fold-const.cc
index cd410e50d779..da96ed34a4c3 100644
--- a/gcc/fold-const.cc
+++ b/gcc/fold-const.cc
@@ -6188,7 +6188,6 @@ static tree
merge_truthop_with_opposite_arm (location_t loc, tree op, tree cmpop,
bool rhs_only)
{
- tree type = TREE_TYPE (cmpop);
enum tree_code code = TREE_CODE (cmpop);
enum tree_code truthop_code = TREE_CODE (op);
tree lhs = TREE_OPERAND (op, 0);
@@ -6204,6 +6203,8 @@ merge_truthop_with_opposite_arm (location_t loc, tree op,
tree cmpop,
if (TREE_CODE_CLASS (code) != tcc_comparison)
return NULL_TREE;
+ tree type = TREE_TYPE (TREE_OPERAND (cmpop, 0));
+
if (rhs_code == truthop_code)
{
tree newrhs = merge_truthop_with_opposite_arm (loc, rhs, cmpop,
rhs_only);
diff --git a/gcc/testsuite/gcc.dg/float_opposite_arm-1.c
b/gcc/testsuite/gcc.dg/float_opposite_arm-1.c
new file mode 100644
index 000000000000..d2dbff350663
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/float_opposite_arm-1.c
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-options "-O1 -fdump-tree-original -fdump-tree-optimized" } */
+/* { dg-add-options ieee } */
+/* PR middle-end/95351 */
+
+int Foo(double possiblyNAN, double b, double c)
+{
+ return (possiblyNAN <= 2.0) || ((possiblyNAN > 2.0) && (b > c));
+}
+
+/* Make sure we don't remove either >/<= */
+
+/* { dg-final { scan-tree-dump "possiblyNAN > 2.0e.0" "original" } } */
+/* { dg-final { scan-tree-dump "possiblyNAN_\[0-9\]+.D. > 2.0e.0" "optimized"
} } */
+
+/* { dg-final { scan-tree-dump "possiblyNAN <= 2.0e.0" "original" } } */
+/* { dg-final { scan-tree-dump "possiblyNAN_\[0-9\]+.D. <= 2.0e.0" "optimized"
} } */
