Add build system and infra for the pl directory

- pl/ is built from top-level Makefile by adding pl to SUBS
- PLSUBS lists all pl/ subdirectories that can be built,
  it only contains math for now. Please modify this list in
  the top-level config.mk.
- pl libraries and infrastructure is built in build/pl/
- As a result math/ and pl/math generate separate test and bench
  binaries.
- Use infrastructure provided in math/test to test and profile
  pl/math routines. The build system ensures the appropriate
  header files are first copied to build/pl/include/test to define
  wrappers and entries in ulp and mathbench.
- Copyied scalar erff from math/ to pl/math/ to show build
  system is functional.
- pl mathlib libraries are built separately to the main/portable
  mathlib libraries and installed alongside.

1 files changed, 17 insertions, 0 deletions

diff --git a/pl/math/test/testcases/directed/erff.tst b/pl/math/test/testcases/directed/erff.tst
new file mode 100644
index 0000000..48a3d6e
--- /dev/null
+++ b/pl/math/test/testcases/directed/erff.tst
@@ -0,0 +1,17 @@
+; erff.tst
+;
+; Copyright (c) 2007-2022, Arm Limited.
+; SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
+
+func=erff op1=7fc00001 result=7fc00001 errno=0
+func=erff op1=ffc00001 result=7fc00001 errno=0
+func=erff op1=7f800001 result=7fc00001 errno=0 status=i
+func=erff op1=ff800001 result=7fc00001 errno=0 status=i
+func=erff op1=7f800000 result=3f800000 errno=0
+func=erff op1=ff800000 result=bf800000 errno=0
+func=erff op1=00000000 result=00000000 errno=ERANGE
+func=erff op1=80000000 result=80000000 errno=ERANGE
+func=erff op1=00000001 result=00000001 errno=0 status=ux
+func=erff op1=80000001 result=80000001 errno=0 status=ux
+func=erff op1=3f800000 result=3f57bb3d.3a0 errno=0
+func=erff op1=bf800000 result=bf57bb3d.3a0 errno=0