* [COMMITTED] [PR tree-optimization/107052] range-ops: Pass nonzero masks through cast.
@ 2022-10-05 12:21 Aldy Hernandez
0 siblings, 0 replies; 2+ messages in thread
From: Aldy Hernandez @ 2022-10-05 12:21 UTC (permalink / raw)
To: GCC patches; +Cc: Andrew MacLeod, uli, Aldy Hernandez
Track nonzero masks through a cast in range-ops.
We could also track through a truncating cast if the mask fits in the
outer type. I will do that as a follow-up patch because I already have
this patchset tested.
PR tree-optimization/107052
gcc/ChangeLog:
* range-op.cc (operator_cast::fold_range): Set nonzero mask.
---
gcc/range-op.cc | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/gcc/range-op.cc b/gcc/range-op.cc
index 4f647abd91c..6fa27a8904e 100644
--- a/gcc/range-op.cc
+++ b/gcc/range-op.cc
@@ -2515,6 +2515,14 @@ operator_cast::fold_range (irange &r, tree type ATTRIBUTE_UNUSED,
if (r.varying_p ())
return true;
}
+
+ // Pass nonzero mask through the cast.
+ if (!truncating_cast_p (inner, outer))
+ {
+ wide_int nz = inner.get_nonzero_bits ();
+ nz = wide_int::from (nz, TYPE_PRECISION (type), TYPE_SIGN (inner.type ()));
+ r.set_nonzero_bits (nz);
+ }
return true;
}
--
2.37.1
^ permalink raw reply [flat|nested] 2+ messages in thread
* [COMMITTED] [PR tree-optimization/107052] range-ops: Pass nonzero masks through cast.
@ 2022-10-05 12:22 Aldy Hernandez
0 siblings, 0 replies; 2+ messages in thread
From: Aldy Hernandez @ 2022-10-05 12:22 UTC (permalink / raw)
To: GCC patches; +Cc: Andrew MacLeod, drepper, Aldy Hernandez
Track nonzero masks through a cast in range-ops.
We could also track through a truncating cast if the mask fits in the
outer type. I will do that as a follow-up patch because I already have
this patchset tested.
PR tree-optimization/107052
gcc/ChangeLog:
* range-op.cc (operator_cast::fold_range): Set nonzero mask.
---
gcc/range-op.cc | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/gcc/range-op.cc b/gcc/range-op.cc
index 4f647abd91c..6fa27a8904e 100644
--- a/gcc/range-op.cc
+++ b/gcc/range-op.cc
@@ -2515,6 +2515,14 @@ operator_cast::fold_range (irange &r, tree type ATTRIBUTE_UNUSED,
if (r.varying_p ())
return true;
}
+
+ // Pass nonzero mask through the cast.
+ if (!truncating_cast_p (inner, outer))
+ {
+ wide_int nz = inner.get_nonzero_bits ();
+ nz = wide_int::from (nz, TYPE_PRECISION (type), TYPE_SIGN (inner.type ()));
+ r.set_nonzero_bits (nz);
+ }
return true;
}
--
2.37.1
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