aarch64: Use x30 as temporary in SVE TLSDESC patterns

gcc.dg/torture/tls/tls-reload-1.c started ICEing for SVE some time
during the GCC 11 cycle (not sure when).  The problem is that we
had an output reload on a call_insn, which isn't a supported
combination.

This patch uses LR_REGNUM instead.  The resulting "blr x30"
might not perform as well on some CPUs, but in this context
the difference shouldn't be noticeable.

gcc/
	* config/aarch64/aarch64.md (tlsdesc_small_sve_<mode>): Use X30
	as the temporary register.

diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
index 15bbc10..a149748 100644 (file)
--- a/gcc/config/aarch64/aarch64.md
+++ b/gcc/config/aarch64/aarch64.md
@@ -6818,10 +6818,9 @@
                        UNSPEC_TLSDESC))
              (const_int 0)))
    (unspec:DI [(match_operand:DI 1 "const_int_operand")] UNSPEC_CALLEE_ABI)
-   (clobber (reg:DI LR_REGNUM))
-   (clobber (match_scratch:DI 2 "=r"))]
+   (clobber (reg:DI LR_REGNUM))]
   "TARGET_TLS_DESC && TARGET_SVE"
-  "adrp\\tx0, %A0\;ldr\\t%<w>2, [x0, #%L0]\;add\\t<w>0, <w>0, %L0\;.tlsdesccall\\t%0\;blr\\t%2"
+  "adrp\\tx0, %A0\;ldr\\t<w>30, [x0, #%L0]\;add\\t<w>0, <w>0, %L0\;.tlsdesccall\\t%0\;blr\\tx30"
   [(set_attr "type" "call")
    (set_attr "length" "16")])