Committed as obvious after regtest for cris-elf together with the "next" patch, that replaces unspec CRIS_UNSPEC_SWAP_BITS with bitreverse (which hit the ICE).
-- >8 -- This seems to have just been overlooked when introducing BITREVERSE. Note that the function name mem_loc_descriptor is a misnomer; it'd better be called rtx_loc_descriptor or any_loc_descriptor, because "anything" RTX can end up here. To wit, when introducing new RTL that ends up as code or for other reasons appear in debug expressions, don't forget to update this function. This was observed by building libstdc+++ for cris-elf with a patch replacing the CRIS_UNSPEC_SWAP_BITS by bitreverse, as hitting the internal-error-generating default case. Looking at the BSWAP, POPCOUNT and ROTATE cases, BITREVERSE can probably be fully expressed as DWARF code if need be, but let's start with not throwing an internal error. gcc: * dwarf2out.cc (mem_loc_descriptor): Handle BITREVERSE. --- gcc/dwarf2out.cc | 1 + 1 file changed, 1 insertion(+) diff --git a/gcc/dwarf2out.cc b/gcc/dwarf2out.cc index 9112fc0c64b5..e973644102c0 100644 --- a/gcc/dwarf2out.cc +++ b/gcc/dwarf2out.cc @@ -16940,6 +16940,7 @@ mem_loc_descriptor (rtx rtl, machine_mode mode, case CLOBBER: case SMUL_HIGHPART: case UMUL_HIGHPART: + case BITREVERSE: break; case CONST_STRING: -- 2.30.2