Hi, I think I found a bug in gcc 4.7.3 in gcc/caller-save.c at line 158 :
gcc_assert (cached_reg_save_code[reg][mode]);
should be :
gcc_assert (cached_reg_save_code[reg][mode] != -1);
because cached_reg_save_code contains INSN_CODES that can be equal to 0 (see
attached patch)
In my backend movdi pattern has unfortunately code '0' (depends on pattern
declaration order).
When gcc tried to determine if my DI regs can be saved and restore as 'caller
saves' (in caller-save.c::init_caller_save()) it failed on this wrong assertion.
Regards,
Selim
caller-save.patch
Description: caller-save.patch
