https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113098
Bug ID: 113098
Summary: [14 Regression] LRA ICE building glibc for mips
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: jsm28 at gcc dot gnu.org
Target Milestone: ---
Target: mips*-*-*
Created attachment 56912
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56912&action=edit
preprocessed source
Compile the attached code, from glibc, with -mabi=32 -O2 for MIPS (I used a
mips64-linux-gnu compiler configured --with-mips-plt --with-nan=2008
--with-arch-64=mips64r2 --with-arch-32=mips32r2; the --with-arch-32 part may
well be required to reproduce the issue).
offtime.c: In function '__offtime':
offtime.c:86:1: error: unable to find a register to spill
offtime.c:86:1: error: this is the insn:
(insn 1015 3973 3974 24 (parallel [
(set (reg:SI 2971)
(plus:SI (mult:SI (reg:SI 2367)
(reg:SI 898))
(reg:SI 2972)))
(clobber (reg:SI 2881 [2814]))
(clobber (reg:SI 2815))
]) "offtime.c":67:84 42 {*mul_acc_si}
(expr_list:REG_UNUSED (reg:SI 2815)
(expr_list:REG_UNUSED (reg:SI 2881 [2814])
(expr_list:REG_DEAD (reg:SI 2972)
(expr_list:REG_DEAD (reg:SI 2367)
(expr_list:REG_DEAD (reg:SI 898)
(nil)))))))
during RTL pass: reload
offtime.c:86:1: internal compiler error: in lra_split_hard_reg_for, at
lra-assigns.cc:1862
0x6f3f05 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/scratch/jmyers/glibc/many14/src/gcc/gcc/rtl-error.cc:108
0xd53048 lra_split_hard_reg_for()
/scratch/jmyers/glibc/many14/src/gcc/gcc/lra-assigns.cc:1862
0xd4c9c9 lra(_IO_FILE*, int)
/scratch/jmyers/glibc/many14/src/gcc/gcc/lra.cc:2518
0xd00d97 do_reload
/scratch/jmyers/glibc/many14/src/gcc/gcc/ira.cc:5973
0xd00d97 execute
/scratch/jmyers/glibc/many14/src/gcc/gcc/ira.cc:6161
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
ICE introduced by
commit 989e67f827b74b76e58abe137ce12d948af2290c
Author: Vladimir N. Makarov <vmaka...@redhat.com>
Date: Mon Dec 18 17:12:23 2023 -0500
[PR112918][LRA]: Fixing IRA ICE on m68k
Some GCC tests on m68K port of LRA is failed on `maximum number of
generated reload insns per insn achieved`. The problem is in that for
subreg reload LRA can not narrow reg class more from ALL_REGS to
GENERAL_REGS and then to data regs or address regs. The patch permits
narowing reg class from reload insns if this results in succesful
matching of reg operand.
