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* [gcc r13-2916] cselib: Keep track of further subvalue relations
@ 2022-09-28 15:29 Stefan Schulze Frielinghaus
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From: Stefan Schulze Frielinghaus @ 2022-09-28 15:29 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:d0b00b63a39108311f2e6f9cbe9072579f57df7c
commit r13-2916-gd0b00b63a39108311f2e6f9cbe9072579f57df7c
Author: Stefan Schulze Frielinghaus <stefansf@linux.ibm.com>
Date: Wed Sep 28 17:27:11 2022 +0200
cselib: Keep track of further subvalue relations
Whenever a new cselib value is created check whether a smaller value
exists which is contained in the bigger one. If so add a subreg
relation to locs of the smaller one.
gcc/ChangeLog:
* cselib.cc (new_cselib_val): Keep track of further subvalue
relations.
Diff:
---
gcc/cselib.cc | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/gcc/cselib.cc b/gcc/cselib.cc
index 6a5609786fa..9b582e5d3d6 100644
--- a/gcc/cselib.cc
+++ b/gcc/cselib.cc
@@ -1569,6 +1569,26 @@ new_cselib_val (unsigned int hash, machine_mode mode, rtx x)
e->locs = 0;
e->next_containing_mem = 0;
+ scalar_int_mode int_mode;
+ if (REG_P (x) && is_int_mode (mode, &int_mode)
+ && REG_VALUES (REGNO (x)) != NULL
+ && (!cselib_current_insn || !DEBUG_INSN_P (cselib_current_insn)))
+ {
+ rtx copy = shallow_copy_rtx (x);
+ scalar_int_mode narrow_mode_iter;
+ FOR_EACH_MODE_UNTIL (narrow_mode_iter, int_mode)
+ {
+ PUT_MODE_RAW (copy, narrow_mode_iter);
+ cselib_val *v = cselib_lookup (copy, narrow_mode_iter, 0, VOIDmode);
+ if (v)
+ {
+ rtx sub = lowpart_subreg (narrow_mode_iter, e->val_rtx, int_mode);
+ if (sub)
+ new_elt_loc_list (v, sub);
+ }
+ }
+ }
+
if (dump_file && (dump_flags & TDF_CSELIB))
{
fprintf (dump_file, "cselib value %u:%u ", e->uid, hash);
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