https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112530
Bug ID: 112530
Summary: [14 Regression] New ICE in gimple->rtl expansion after
recent change
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: law at gcc dot gnu.org
Target Milestone: ---
This change:
commit a5922427c29fad177251d89cc946d1c5bfc135eb
Author: Andrew Stubbs <a...@codesourcery.com>
Date: Fri Oct 20 16:26:51 2023 +0100
vect: Don't set excess bits in unform masks
AVX ignores any excess bits in the mask (at least for vector sizes >=8),
but
AMD GCN magically uses a larger vector than was intended (the smaller sizes
are
"fake"), leading to wrong-code.
This patch fixes amdgcn execution failures in gcc.dg/vect/pr81740-1.c,
gfortran.dg/c-interop/contiguous-1.f90,
gfortran.dg/c-interop/ff-descriptor-7.f90, and others.
gcc/ChangeLog:
* expr.cc (store_constructor): Add "and" operation to uniform mask
generation.
Causes regressions on the alpha port (these can be seen with a simple cross
compiler, a full toolchain is not necessary):
gcc.c-torture/execute/pr110817-3.c -O1 (test for excess errors)
gcc.c-torture/execute/pr110817-3.c -O2 (test for excess errors)
gcc.c-torture/execute/pr110817-3.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none (test for excess errors)
gcc.c-torture/execute/pr110817-3.c -O3 -g (test for excess errors)
gcc.c-torture/execute/pr110817-3.c -Os (test for excess errors)
dump file: j.c.262r.expand
j.c: In function ‘main’:
j.c:10:28: internal compiler error: Segmentation fault
10 | volatile signed int t = x[0];
| ~^~~
0x1510fc4 crash_signal
/home/jlaw/test/gcc/gcc/toplev.cc:316
0x7fcfa388efcf ???
./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0
0xf81369 emit_move_insn(rtx_def*, rtx_def*)
/home/jlaw/test/gcc/gcc/expr.cc:4249
0xf8d86c store_constructor(tree_node*, rtx_def*, int, poly_int<1u, long>, bool)
/home/jlaw/test/gcc/gcc/expr.cc:7494
0xf93de0 expand_constructor
/home/jlaw/test/gcc/gcc/expr.cc:8970
0xf9de14 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
/home/jlaw/test/gcc/gcc/expr.cc:11245
0xf93e9f expand_expr_real(tree_node*, rtx_def*, machine_mode, expand_modifier,
rtx_def**, bool)
/home/jlaw/test/gcc/gcc/expr.cc:9049
0xf9bd72 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
/home/jlaw/test/gcc/gcc/expr.cc:10860
0xf93e9f expand_expr_real(tree_node*, rtx_def*, machine_mode, expand_modifier,
rtx_def**, bool)
/home/jlaw/test/gcc/gcc/expr.cc:9049
0xdc48ba expand_expr(tree_node*, rtx_def*, machine_mode, expand_modifier)
/home/jlaw/test/gcc/gcc/expr.h:310
[ ... ]
