i386: Improve access to _Atomic DImode location via XMM regs for SSE4.1 x86_32 targets

Use MOVD/PEXTRD and MOVD/PINSRD insn sequences to move DImode value
between XMM and GPR register sets for SSE4.1 x86_32 targets in order
to avoid spilling the value to stack.

The load from _Atomic location a improves from:

	movq    a, %xmm0
	movq    %xmm0, (%esp)
	movl    (%esp), %eax
	movl    4(%esp), %edx

to:
	movq    a, %xmm0
	movd    %xmm0, %eax
	pextrd  $1, %xmm0, %edx

The store to _Atomic location b improves from:

	movl    %eax, (%esp)
	movl    %edx, 4(%esp)
	movq    (%esp), %xmm0
	movq    %xmm0, b

to:
	movd    %eax, %xmm0
	pinsrd  $1, %edx, %xmm0
	movq    %xmm0, b

gcc/ChangeLog:

	* config/i386/sync.md (atomic_loaddi_fpu): Use movd/pextrd
	to move DImode value from XMM to GPR for TARGET_SSE4_1.
	(atomic_storedi_fpu): Use movd/pinsrd to move DImode value
	from GPR to XMM for TARGET_SSE4_1.

0 files changed, 0 insertions, 0 deletions