https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96791
--- Comment #6 from Arseny Solokha <asolokha at gmx dot com> ---
There's also a seemingly related case where gcc ICES in branch
if (GET_MODE_CLASS (to_mode) == MODE_PARTIAL_INT)
instead.
The following testcase is reduced from
gcc/testsuite/gcc.target/powerpc/pr96125.c:
void __attribute__ ((target ("cpu=power10")))
le (__vector_quad *ql)
{
__vector_quad hg;
__builtin_mma_xxsetaccz (&hg);
*ql = hg;
}
% powerpc-e300c3-linux-gnu-gcc-11.0.0 -c ihgsd1rx.c
during RTL pass: expand
ihgsd1rx.c: In function 'le':
ihgsd1rx.c:7:7: internal compiler error: in convert_mode_scalar, at expr.c:394
7 | *ql = hg;
| ~~~~^~~~
0x5ef679 convert_mode_scalar
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/expr.c:394
0xa2f11b convert_modes(machine_mode, machine_mode, rtx_def*, int)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/expr.c:737
0xa0ea12 extract_integral_bit_field
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/expmed.c:1961
0xa0ea12 extract_bit_field_1
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/expmed.c:1846
0xa0f0b2 extract_bit_field(rtx_def*, poly_int<1u, unsigned long>, poly_int<1u,
unsigned long>, int, rtx_def*, machine_mode, machine_mode, bool, rtx_def**)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/expmed.c:2118
0xa19b88 expand_misaligned_mem_ref
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/expr.c:8620
0xa284cf expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/expr.c:10517
0xa34c1b store_expr(tree_node*, rtx_def*, int, bool, bool)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/expr.c:5858
0xa36f21 expand_assignment(tree_node*, tree_node*, bool)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/expr.c:5594
0x90062f expand_gimple_stmt_1
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/cfgexpand.c:3749
0x90062f expand_gimple_stmt
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/cfgexpand.c:3847
0x90655a expand_gimple_basic_block
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/cfgexpand.c:5888
0x90814f execute
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/cfgexpand.c:6572
And compiling w/ -O1 yields the following instead:
% powerpc-e300c3-linux-gnu-gcc-11.0.0 -O1 -c ihgsd1rx.c
ihgsd1rx.c: In function 'le':
ihgsd1rx.c:8:1: error: insn does not satisfy its constraints:
8 | }
| ^
(insn 53 52 54 2 (set (mem/c:POI (plus:SI (reg/f:SI 1 1)
(const_int 16 [0x10])) [3 %sfp+-80 S32 A128])
(reg:POI 32 0 [ _1 ])) 2190 {*movpoi}
(nil))
during RTL pass: pro_and_epilogue
ihgsd1rx.c:8:1: internal compiler error: in extract_constrain_insn, at
recog.c:2195
0x65b80d _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/rtl-error.c:108
0x65b839 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/rtl-error.c:118
0x659e71 extract_constrain_insn(rtx_insn*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/recog.c:2195
0xcf731c copyprop_hardreg_forward_1
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/regcprop.c:802
0xcf8101 copyprop_hardreg_forward_bb_without_debug_insn(basic_block_def*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/regcprop.c:1181
0xd56f3d prepare_shrink_wrap
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/shrink-wrap.c:451
0xd56f3d try_shrink_wrapping(edge_def**, rtx_insn*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/shrink-wrap.c:674
0xa92dc0 thread_prologue_and_epilogue_insns()
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/function.c:5909
0xa934c6 rest_of_handle_thread_prologue_and_epilogue
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/function.c:6394
0xa934c6 execute
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200830/work/gcc-11-20200830/gcc/function.c:6470
(Of course I can file a separate PR if this case is not related to the one
reported in comment 0.)
