[PATCH] Avoid ICE on m68k -fzero-call-used-regs -fpic [PR110934]

PR110934 is a problem on m68k where -fzero-call-used-regs -fpic ICEs
when clearing an FP register.

The generic code generates an XFmode move of zero to that register,
which becomes an XFmode load from initialized data, which due to -fpic
uses a non-constant address, which the backend rejects.  The
zero-call-used-regs pass runs very late, after register allocation and
frame layout, and at that point we can't allow new uses of the PIC
register or new pseudos.

To clear an FP register on m68k it's enough to do the move in SFmode,
but the generic code can't be told to do that, so this patch updates
m68k to use its own TARGET_ZERO_CALL_USED_REGS.

Bootstrapped and regression tested on m68k-linux-gnu.

Ok for master? (I don't have commit rights.)

gcc/

	PR target/110934
	* config/m68k/m68k.cc (m68k_zero_call_used_regs): New function.
	(TARGET_ZERO_CALL_USED_REGS): Define.

gcc/testsuite/

	PR target/110934
	* gcc.target/m68k/pr110934.c: New test.

0 files changed, 0 insertions, 0 deletions