https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123269
Bug ID: 123269
Summary: [16 Regression] Recent change causes predcomm-dse
failures
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: law at gcc dot gnu.org
Target Milestone: ---
This change:
commit f5ddd4ba0ba1b00838e36966fbaf771c581b99ef (HEAD)
Author: Robin Dapp <[email protected]>
Date: Thu Nov 6 13:16:40 2025 +0100
RISC-V: Add VLS modes to autovec iterators.
In order to allow more VLS vectorization, add more VLS modes to the
autovec expanders, as well as some missing VLS modes that I encountered
while
testing.
gcc/ChangeLog:
* config/riscv/autovec.md: Ditto.
* config/riscv/autovec-opt.md: Add VLS modes.
* config/riscv/vector-crypto.md: Ditto.
* config/riscv/vector-iterators.md: Ditto.
* config/riscv/vector.md (@pred_ffs<VB:mode><P:mode>): Ditto.
(@pred_ffs<VB_VLS:mode><P:mode>): Ditto.
Is triggering these regressions on riscv32-elf:
unix//-march=rv32gcv: gcc: gcc.dg/tree-ssa/predcom-dse-4.c scan-tree-dump pcom
"Store-stores chain"
unix//-march=rv32gcv: gcc: gcc.dg/tree-ssa/predcom-dse-4.c scan-tree-dump pcom
"Store-stores chain"
unix//-march=rv32gcv: gcc: gcc.dg/tree-ssa/predcom-dse-7.c scan-tree-dump pcom
"Store-stores chain"
unix//-march=rv32gcv: gcc: gcc.dg/tree-ssa/predcom-dse-7.c scan-tree-dump pcom
"Store-stores chain"
