commit 868a5774431e889aa2c35bf7f678433cfa21e3d4
author Richard Sandiford <richard.sandiford@arm.com> Thu Aug 14 17:56:51 2025 +0100
committer Richard Sandiford <richard.sandiford@arm.com> Thu Aug 14 17:56:51 2025 +0100
tree 1f61d47325d6627892406988b0e32f9c6e9317ff
parent 701193a7a6d3f3f345bf336e7ebc7d6fa1e0c5ac

aarch64: Mark SME functions as .variant_pcs [PR121414]

Unlike base PCS functions, __arm_streaming and __arm_streaming_compatible
functions allow/require PSTATE.SM to be 1 on entry, so they need to
be treated as STO_AARCH64_VARIANT_PCS.

Similarly, functions that share ZA or ZT0 with their callers require
ZA to be active on entry, whereas the base PCS requires ZA to be
dormant or off.  These functions too need to be marked as having
a variant PCS.

gcc/
	PR target/121414
	* config/aarch64/aarch64.cc (aarch64_is_variant_pcs): New function,
	split out from...
	(aarch64_asm_output_variant_pcs): ...here.  Handle various types
	of SME function type.

gcc/testsuite/
	PR target/121414
	* gcc.target/aarch64/sme/pr121414_1.c: New test.