The attached reduced test case derived from ac.f90 in the polyhedron benchmark
suite gives and ICE when compiled with gfortran 4.5 using -O3 -mfma4. This ICE
showed up in gcc 4.5 rev 154969 with the following check in:
2009-12-02 Richard Henderson <r...@redhat.com>
* config/i386/i386.c (ix86_fixup_binary_operands): For FMA4, force
all operands into registers.
The ICE is as follows
bug-red.f90: In function wolff:
bug-red.f90:7:0: error: unrecognizable insn:
(insn 16 15 17 3 bug-red.f90:1 (parallel [
(set (mem:SI (reg/v/f:DI 71 [ iclsiz ]) [2 S4 A32])
(plus:SI (reg:SI 72)
(const_int 4 [0x4])))
(clobber (reg:CC 17 flags))
]) -1 (expr_list:REG_EQUAL (plus:SI (mem:SI (reg/v/f:DI 71 [ iclsiz ])
[2 S4 A32])
(const_int 4 [0x4]))
(nil)))
bug-red.f90:7:0: internal compiler error: in extract_insn, at recog.c:2097
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
--
Summary: ICE on compilation of polyhedron benchmarks with -mfma4
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: harsha dot jagasia at amd dot com
GCC build triplet: x86_64-linux
GCC host triplet: x86_64-linux
GCC target triplet: x86_64-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42664
