commit 98d7f305d5081bc91c16b9d2b4d62196b86bca86
author H.J. Lu <hjl.tools@gmail.com> Fri Jul 16 10:29:46 2021 -0700
committer H.J. Lu <hjl.tools@gmail.com> Tue Aug 03 07:11:58 2021 -0700
tree aafd8e56a1cd67c8a936cfbe39839116ec0fca43
parent a1a2654cdc90e9aa561a0e853b4b1372892afb70

x86: Use XMM31 for scratch SSE register

In 64-bit mode, use XMM31 for scratch SSE register to avoid vzeroupper
if possible.

gcc/

	* config/i386/i386.c (ix86_gen_scratch_sse_rtx): In 64-bit mode,
	try XMM31 to avoid vzeroupper.

gcc/testsuite/

	* gcc.target/i386/avx-vzeroupper-14.c: Pass -mno-avx512f to
	disable XMM31.
	* gcc.target/i386/avx-vzeroupper-15.c: Likewise.
	* gcc.target/i386/pr82941-1.c: Updated.  Check for vzeroupper.
	* gcc.target/i386/pr82942-1.c: Likewise.
	* gcc.target/i386/pr82990-1.c: Likewise.
	* gcc.target/i386/pr82990-3.c: Likewise.
	* gcc.target/i386/pr82990-5.c: Likewise.
	* gcc.target/i386/pr100865-4b.c: Likewise.
	* gcc.target/i386/pr100865-6b.c: Likewise.
	* gcc.target/i386/pr100865-7b.c: Likewise.
	* gcc.target/i386/pr100865-10b.c: Likewise.
	* gcc.target/i386/pr100865-8b.c: Updated.
	* gcc.target/i386/pr100865-9b.c: Likewise.
	* gcc.target/i386/pr100865-11b.c: Likewise.
	* gcc.target/i386/pr100865-12b.c: Likewise.