[Bug c/29895] New: ice for legal code

["dcb314 at hotmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

I just tried to compile Linux kernel version 2.6.18.2
with gcc-4.3-20061118 snapshot on a x86_64 box.

The compiler said

  /home/dcb/gnu/43-20061118/results/bin/gcc -g -O3 -Wall -march=opteron
-Wp,-MD,arch/x86_64/lib/.csum-partial.o.d  -nostdinc -isystem
/home/dcb/gnu/43-20061118/results/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/include
-D__KERNEL__ -Iinclude  -include include/linux/autoconf.h -Wall -Wundef
-Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Os  -m64
-mno-red-zone -mcmodel=kernel -pipe -fno-reorder-blocks -Wno-sign-compare
-funit-at-a-time -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -fno-omit-frame-pointer
-fno-optimize-sibling-calls -fasynchronous-unwind-tables -g 
-fno-stack-protector -Wdeclaration-after-statement -Wno-pointer-sign 
-funroll-loops   -ffunction-sections -D"KBUILD_STR(s)=#s"
-D"KBUILD_BASENAME=KBUILD_STR(csum_partial)" 
-D"KBUILD_MODNAME=KBUILD_STR(csum_partial)" -c -o
arch/x86_64/lib/.tmp_csum-partial.o arch/x86_64/lib/csum-partial.c
arch/x86_64/lib/csum-partial.c: In function 'csum_partial':
arch/x86_64/lib/csum-partial.c:138: error: verify_flow_info: Block 29 has
loop_father, but there are no loops
arch/x86_64/lib/csum-partial.c:138: error: verify_flow_info: Block 28 has
loop_father, but there are no loops

Preprocessed source code attached. Flags -Os -funroll-loops required.

If it is any help, this code worked fine in gcc snapshot 4.3-20051111


-- 
           Summary: ice for legal code
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dcb314 at hotmail dot com
  GCC host triplet: x86_64_linux_suse


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29895