PowerPC: Add future hwcap2 bits

This patch adds support for the two new HWCAP2 fields used by the
__builtin_cpu_supports function.  It adds support in the target_clones
attribute for -mcpu=future.

The two new __builtin_cpu_supports tests are:
	__builtin_cpu_supports ("isa_3_1")
	__builtin_cpu_supports ("mma")

The bits used are the bits that the Linux kernel engineers will be using for
these new features.

testsuite/
2020-06-05  Michael Meissner  <meissner@linux.ibm.com>

	* gcc.target/powerpc/clone3.c: New test for using 'future' with
	the target_clones attribute.

diff --git a/gcc/testsuite/gcc.target/powerpc/clone3.c b/gcc/testsuite/gcc.target/powerpc/clone3.c
new file mode 100644 (file)
index 0000000..93ee41d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/clone3.c
@@ -0,0 +1,33 @@
+/* { dg-do compile { target { powerpc*-*-linux* && lp64 } } } */
+/* { dg-options "-mdejagnu-cpu=power8 -O2" } */
+/* { dg-require-effective-target powerpc_pcrel } */
+/* { dg-require-effective-target ppc_cpu_supports_hw } */
+
+/* Power9 (aka, ISA 3.0) has a MODSD instruction to do modulus, while Power8
+   (aka, ISA 2.07) has to do modulus with divide and multiply.  Make sure
+   both clone functions are generated.
+
+   FUTURE has pc-relative instructions to access static values, while earlier
+   systems used TOC addressing.
+
+   Restrict ourselves to Linux, since IFUNC might not be supported in other
+   operating systems.  */
+
+static long s;
+long *p = &s;
+
+__attribute__((target_clones("cpu=future,cpu=power9,default")))
+long mod_func (long a, long b)
+{
+  return (a % b) + s;
+}
+
+long mod_func_or (long a, long b, long c)
+{
+  return mod_func (a, b) | c;
+}
+
+/* { dg-final { scan-assembler-times {\mdivd\M}  1 } } */
+/* { dg-final { scan-assembler-times {\mmulld\M} 1 } } */
+/* { dg-final { scan-assembler-times {\mmodsd\M} 2 } } */
+/* { dg-final { scan-assembler-times {\mpld\M}   1 } } */