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* [gcc r13-3105] cselib: Skip BImode while keeping track of subvalue relations [PR107088]
@ 2022-10-06 6:47 Stefan Schulze Frielinghaus
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From: Stefan Schulze Frielinghaus @ 2022-10-06 6:47 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:5fc4d3e1837ea4850aac6460f563913f1d3fc5b8
commit r13-3105-g5fc4d3e1837ea4850aac6460f563913f1d3fc5b8
Author: Stefan Schulze Frielinghaus <stefansf@linux.ibm.com>
Date: Thu Oct 6 08:43:53 2022 +0200
cselib: Skip BImode while keeping track of subvalue relations [PR107088]
For BImode get_narrowest_mode evaluates to QImode but BImode < QImode.
Thus FOR_EACH_MODE_UNTIL never reaches BImode and iterates until OImode
for which no wider mode exists so we end up with VOIDmode and fail.
Fixed by adding a size guard so we effectively skip BImode.
gcc/ChangeLog:
PR rtl-optimization/107088
* cselib.cc (new_cselib_val): Skip BImode while keeping track of
subvalue relations.
Diff:
---
gcc/cselib.cc | 1 +
1 file changed, 1 insertion(+)
diff --git a/gcc/cselib.cc b/gcc/cselib.cc
index 9b582e5d3d6..2abc763a3f8 100644
--- a/gcc/cselib.cc
+++ b/gcc/cselib.cc
@@ -1571,6 +1571,7 @@ new_cselib_val (unsigned int hash, machine_mode mode, rtx x)
scalar_int_mode int_mode;
if (REG_P (x) && is_int_mode (mode, &int_mode)
+ && GET_MODE_SIZE (int_mode) > 1
&& REG_VALUES (REGNO (x)) != NULL
&& (!cselib_current_insn || !DEBUG_INSN_P (cselib_current_insn)))
{
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