From: Aldy Hernandez <aldyh@redhat.com>
To: GCC patches <gcc-patches@gcc.gnu.org>
Cc: Andrew MacLeod <amacleod@redhat.com>, Aldy Hernandez <aldyh@redhat.com>
Subject: [PATCH] Export value/mask known bits from CCP.
Date: Mon, 17 Jul 2023 09:56:45 +0200 [thread overview]
Message-ID: <20230717075645.243653-1-aldyh@redhat.com> (raw)
Currently CCP throws away the known 1 bits because VRP and irange have
traditionally only had a way of tracking known 0s (set_nonzero_bits).
With the ability to keep all the known bits in the irange, we can now
save this between passes.
OK?
gcc/ChangeLog:
* tree-ssa-ccp.cc (ccp_finalize): Export value/mask known bits.
---
gcc/tree-ssa-ccp.cc | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/gcc/tree-ssa-ccp.cc b/gcc/tree-ssa-ccp.cc
index 0d0f02a8442..64d5fa81334 100644
--- a/gcc/tree-ssa-ccp.cc
+++ b/gcc/tree-ssa-ccp.cc
@@ -1020,11 +1020,9 @@ ccp_finalize (bool nonzero_p)
else
{
unsigned int precision = TYPE_PRECISION (TREE_TYPE (val->value));
- wide_int nonzero_bits
- = (wide_int::from (val->mask, precision, UNSIGNED)
- | wi::to_wide (val->value));
- nonzero_bits &= get_nonzero_bits (name);
- set_nonzero_bits (name, nonzero_bits);
+ wide_int value = wi::to_wide (val->value);
+ wide_int mask = wide_int::from (val->mask, precision, UNSIGNED);
+ set_bitmask (name, value, mask);
}
}
--
2.40.1
next reply other threads:[~2023-07-17 7:56 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-17 7:56 Aldy Hernandez [this message]
2023-07-17 11:52 ` Richard Biener
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