https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108153
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dje at gcc dot gnu.org,
| |segher at gcc dot gnu.org
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
What fails is:
./cc1gm2 -msecure-plt -quiet -dumpbase SYSTEM.mod -dumpbase-ext .mod
-mtune=power8 -mcpu=power8 -version -fpim -fno-scaffold-main
-fno-scaffold-dynamic -fno-scaffold-static -fno-m2-plugin -fdump-system-exports
-B ./ -B /usr/ppc64le-redhat-linux/bin/ -c -fpim -fno-scaffold-main
-fno-scaffold-dynamic -fno-scaffold-static -fno-m2-plugin -fdump-system-exports
-I ../../gcc/m2/gm2-libs -I /usr/lib/gcc/ppc64le-redhat-linux/13/m2/m2pim -I
/usr/lib/gcc/ppc64le-redhat-linux/13/m2/m2log -I
/usr/lib/gcc/ppc64le-redhat-linux/13/m2/m2iso ../../gcc/m2/gm2-libs/SYSTEM.mod
-o /tmp/ccgDXY6u.s
and the ICE is because m2assert_AssertLocation inlined into
m2statement_BuildAssignmentTree sees a difference on
M2Options_OverrideLocation (location) != location
location (in $r30) is 0x80000007, while M2Options_OverrideLocation returned (in
$r3)
0xffffffff80000007 instead.
M2Options_OverrideLocation ends with
0x00000000102396e0 <+32>: extsw r3,r3
before returning, so it clearly sign extends the 32-bit return value to 64-bit.
And the caller compares whole 64-bits:
0x00000000101c7488 <m2statement_BuildAssignmentTree(location_t, tree,
tree)+40>: mr r30,r3
0x00000000101c748c <m2statement_BuildAssignmentTree(location_t, tree,
tree)+44>: mr r29,r4
0x00000000101c7490 <m2statement_BuildAssignmentTree(location_t, tree,
tree)+48>: mr r31,r5
0x00000000101c7494 <m2statement_BuildAssignmentTree(location_t, tree,
tree)+52>: ble 0x101c74a8 <m2statement_BuildAssignmentTree(location_t,
tree, tree)+72>
0x00000000101c7498 <m2statement_BuildAssignmentTree(location_t, tree,
tree)+56>: bl 0x102396c8
<M2Options_OverrideLocation(m2linemap_location_t)+8>
0x00000000101c749c <m2statement_BuildAssignmentTree(location_t, tree,
tree)+60>: nop
=> 0x00000000101c74a0 <m2statement_BuildAssignmentTree(location_t, tree,
tree)+64>: cmpd r3,r30
So, I bet there must be some mismatch on whether M2Options_OverrideLocation
returns a signed or unsigned 32-bit value.
I believe the powerpc64le-linux ABI (and probably various other ABIs) returns
(and passes?) signed 32-bit values sign-extended from 32-bits to 64-bits, and
returns (and passes?) unsigned 32-bit values zero-extended from 32-bits to
64-bits.
Say x86_64-linux doesn't do this, the upper 32 bits when passing or returning
32-bit values are undefined.
