arm: Fix wrong code generated for mve scatter store with writeback intrinsics with...

arm: Fix wrong code generated for mve scatter store with writeback intrinsics with -O2 (PR97271).

This patch fixes (PR97271) the wrong code-gen for mve scatter store with writeback intrinsics with -O2.

$cat bug.c
void
foo (uint32x4_t * addr, const int offset, int32x4_t value)
{
  vstrwq_scatter_base_wb_s32 (addr, 8, value);
}

$ arm-none-eabi-gcc  bug.c -S -O2 -march=armv8.1-m.main+mve -mfloat-abi=hard -o -
Without this patch:
...
foo:
	vldrw.32	q3, [r0]
	vstrw.u32       q0, [q3, #8]!  ---> (A)
	vldr.64 d4, .L3
	vldr.64 d5, .L3+8
	vldrw.32	q3, [r0]
	vstrw.u32       q2, [q3, #8]!  ---> (B)
	bx      lr
...

With this patch:
...
foo:
	vldrw.32	q3, [r0]
	vstrw.u32       q0, [q3, #8]!  --> (C)
	vstrw.32	q3, [r0]
	bx      lr
...

Without this patch 2 vstrw assembly instructions (A and B) are generated for vstrwq_scatter_base_wb_s32
intrinsic where as fix generates only one vstrw assembly instruction (C).

gcc/ChangeLog:

2020-10-06  Srinath Parvathaneni  <srinath.parvathaneni@arm.com>

	PR target/97291
	* config/arm/arm-builtins.c (arm_strsbwbs_qualifiers): Modify array.
	(arm_strsbwbu_qualifiers): Likewise.
	(arm_strsbwbs_p_qualifiers): Likewise.
	(arm_strsbwbu_p_qualifiers): Likewise.
	* config/arm/arm_mve.h (__arm_vstrdq_scatter_base_wb_s64): Modify
	function definition.
	(__arm_vstrdq_scatter_base_wb_u64): Likewise.
	(__arm_vstrdq_scatter_base_wb_p_s64): Likewise.
	(__arm_vstrdq_scatter_base_wb_p_u64): Likewise.
	(__arm_vstrwq_scatter_base_wb_p_s32): Likewise.
	(__arm_vstrwq_scatter_base_wb_p_u32): Likewise.
	(__arm_vstrwq_scatter_base_wb_s32): Likewise.
	(__arm_vstrwq_scatter_base_wb_u32): Likewise.
	(__arm_vstrwq_scatter_base_wb_f32): Likewise.
	(__arm_vstrwq_scatter_base_wb_p_f32): Likewise.
	* config/arm/arm_mve_builtins.def (vstrwq_scatter_base_wb_add_u): Remove
	expansion for the builtin.
	(vstrwq_scatter_base_wb_add_s): Likewise.
	(vstrwq_scatter_base_wb_add_f): Likewise.
	(vstrdq_scatter_base_wb_add_u): Likewise.
	(vstrdq_scatter_base_wb_add_s): Likewise.
	(vstrwq_scatter_base_wb_p_add_u): Likewise.
	(vstrwq_scatter_base_wb_p_add_s): Likewise.
	(vstrwq_scatter_base_wb_p_add_f): Likewise.
	(vstrdq_scatter_base_wb_p_add_u): Likewise.
	(vstrdq_scatter_base_wb_p_add_s): Likewise.
	* config/arm/mve.md (mve_vstrwq_scatter_base_wb_<supf>v4si): Remove
	expand.
	(mve_vstrwq_scatter_base_wb_add_<supf>v4si): Likewise.
	(mve_vstrwq_scatter_base_wb_<supf>v4si_insn): Rename pattern to ...
	(mve_vstrwq_scatter_base_wb_<supf>v4si): This.
	(mve_vstrwq_scatter_base_wb_p_<supf>v4si): Remove expand.
	(mve_vstrwq_scatter_base_wb_p_add_<supf>v4si): Likewise.
	(mve_vstrwq_scatter_base_wb_p_<supf>v4si_insn): Rename pattern to ...
	(mve_vstrwq_scatter_base_wb_p_<supf>v4si): This.
	(mve_vstrwq_scatter_base_wb_fv4sf): Remove expand.
	(mve_vstrwq_scatter_base_wb_add_fv4sf): Likewise.
	(mve_vstrwq_scatter_base_wb_fv4sf_insn): Rename pattern to ...
	(mve_vstrwq_scatter_base_wb_fv4sf): This.
	(mve_vstrwq_scatter_base_wb_p_fv4sf): Remove expand.
	(mve_vstrwq_scatter_base_wb_p_add_fv4sf): Likewise.
	(mve_vstrwq_scatter_base_wb_p_fv4sf_insn): Rename pattern to ...
	(mve_vstrwq_scatter_base_wb_p_fv4sf): This.
	(mve_vstrdq_scatter_base_wb_<supf>v2di): Remove expand.
	(mve_vstrdq_scatter_base_wb_add_<supf>v2di): Likewise.
	(mve_vstrdq_scatter_base_wb_<supf>v2di_insn): Rename pattern to ...
	(mve_vstrdq_scatter_base_wb_<supf>v2di): This.
	(mve_vstrdq_scatter_base_wb_p_<supf>v2di): Remove expand.
	(mve_vstrdq_scatter_base_wb_p_add_<supf>v2di): Likewise.
	(mve_vstrdq_scatter_base_wb_p_<supf>v2di_insn): Rename pattern to ...
	(mve_vstrdq_scatter_base_wb_p_<supf>v2di): This.

gcc/testsuite/ChangeLog:

	PR target/97291
	* gcc.target/arm/mve/intrinsics/vstrdq_scatter_base_wb_p_s64.c: Modify.
	* gcc.target/arm/mve/intrinsics/vstrdq_scatter_base_wb_p_u64.c:
	Likewise.
	* gcc.target/arm/mve/intrinsics/vstrdq_scatter_base_wb_s64.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrdq_scatter_base_wb_u64.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrwq_scatter_base_wb_f32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrwq_scatter_base_wb_p_f32.c:
	Likewise.
	* gcc.target/arm/mve/intrinsics/vstrwq_scatter_base_wb_p_s32.c:
	Likewise.
	* gcc.target/arm/mve/intrinsics/vstrwq_scatter_base_wb_p_u32.c:
	Likewise.
	* gcc.target/arm/mve/intrinsics/vstrwq_scatter_base_wb_s32.c: Likewise.
	* gcc.target/arm/mve/intrinsics/vstrwq_scatter_base_wb_u32.c: Likewise.