Sub-dword vector extend and truncate for amdgcn

Sub-dword vector extend and truncate for amdgcn

2019-12-13  Andrew Stubbs  <ams@codesourcery.com>

	gcc/
	* config/gcn/gcn-valu.md (sdwa): New mode attribute.
	(VCVT_FROM_MODE): Rename to ...
	(VCVT_MODE): ... this.
	(VCVT_TO_MODE): Delete mode iterator.
	(VCVT_FMODE): New mode iterator.
	(VCVT_IMODE): Likewise.
	(<cvt_name><VCVT_FROM_MODE:mode><VCVT_TO_MODE:mode>2<exec>): Change ...
	(<cvt_name><VCVT_MODE:mode><VCVT_FMODE:mode>2<exec>): ... to this.
	(<cvt_name><VCVT_FMODE:mode><VCVT_IMODE:mode>2<exec>): New.
	(zero_convert): New code iterator.
	(convop): New code attribute.
	(<convop><VEC_ALL1REG_INT_ALT:mode><VEC_ALL1REG_INT_MODE:mode>2<exec>)
	: New.
	(extend<VEC_ALL1REG_INT_ALT:mode><VEC_ALL1REG_INT_MODE:mode>2<exec>)
	: New.
	(vec_truncatev64div64si): Rename to ...
	(truncv64di<mode>2): ... this and implement sub-dword patterns.
	(vec_truncatev64div64si_exec): Rename to ...
	(truncv64di<mode>2_exec): ... this and implement sub-dword patterns.
	(<convop><mode>v64di2): New insn_and_split.
	(<convop><mode>v64di2_exec): Likewise.
	(mask_gather_load<mode>): Update truncate names.
	(mask_scatter_store<mode>): Likewise.
	* config/gcn/gcn.c (gcn_expand_scaled_offsets): Update truncate names.

From-SVN: r279372