PATCH [1/n] addr32: Properly use Pmode and word_mode

[Ian Lance Taylor]

"H.J. Lu" <hjl.tools@gmail.com> writes:

>> @@ -11060,8 +11072,8 @@ ix86_expand_split_stack_prologue (void)
>>        {
>>          rtx rax;
>>
>> -         rax = gen_rtx_REG (Pmode, AX_REG);
>> -         emit_move_insn (rax, reg10);
>> +         rax = gen_rtx_REG (word_mode, AX_REG);
>> +         emit_move_insn (rax, gen_rtx_REG (word_mode, R10_REG));
>>          use_reg (&call_fusage, rax);
>>        }
>>
>> Same here. Please review how AX, R10 and R11 are defined and used.
>> Also, this needs review from split stack author.
>
> I CCed Ian. That is the same issue.  We need some scratch registers
> in Pmode to manipulate stack.  But we have to save and restore them
> in word_mode, not Pmode.

Changing Pmode to word_mode is fine here, if the x86 maintainers approve
the rest of the patch.

Ian