Add IR support, ELF section and user documentation for partitioning feature.

The partitioning feature was proposed here:
http://lists.llvm.org/pipermail/llvm-dev/2019-February/130583.html

This is mostly just documentation. The feature itself will be contributed
in subsequent patches.

Differential Revision: https://reviews.llvm.org/D60242

llvm-svn: 361923

1 files changed, 33 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/partition.ll b/llvm/test/CodeGen/X86/partition.ll
new file mode 100644
index 00000000000..cc8d44e399e
--- /dev/null
+++ b/llvm/test/CodeGen/X86/partition.ll
@@ -0,0 +1,33 @@
+; RUN: llc < %s -mtriple=x86_64-unknown-linux | FileCheck %s
+
+; CHECK: .section .llvm_sympart,"",@llvm_sympart,unique,1
+; CHECK-NEXT: .ascii "part1"
+; CHECK-NEXT: .zero 1
+; CHECK-NEXT: .quad f1
+; CHECK-NEXT: .section .llvm_sympart,"",@llvm_sympart,unique,2
+; CHECK-NEXT: .ascii "part4"
+; CHECK-NEXT: .zero 1
+; CHECK-NEXT: .quad g1
+; CHECK-NEXT: .section .llvm_sympart,"",@llvm_sympart,unique,3
+; CHECK-NEXT: .ascii "part5"
+; CHECK-NEXT: .zero 1
+; CHECK-NEXT: .quad a1
+; CHECK-NEXT: .section .llvm_sympart,"",@llvm_sympart,unique,4
+; CHECK-NEXT: .ascii "part6"
+; CHECK-NEXT: .zero 1
+; CHECK-NEXT: .quad i1
+
+define void @f1() partition "part1" {
+  unreachable
+}
+
+define hidden void @f2() partition "part2" {
+  unreachable
+}
+
+declare void @f3() partition "part3"
+
+@g1 = global i32 0, partition "part4"
+
+@a1 = alias i32, i32* @g1, partition "part5"
+@i1 = ifunc void(), void()* @f1, partition "part6"