[LangRef] Improve llvm.mem.parallel_loop_access example

The following changes have been applied:

  - Removed 'align 4'. We can simplify this away, as it does not provide useful
    information in the example.
  - Use named instructions instead of '%0'. This is nicer, but more importantly
    this makes the IR valid. Before we had two assignments to %0 in a single
    example.
  - Add a missing branch instruction to make the loop structure clear.
  - Move one access into outer.for.body to make it not look that empty.
  - The statments that are only in the outer loop body should not reference the
    inner loop metadata, but only the outer loop. Only statements in both loops
    should reference both surrounding loops.
  - Rename the array indexes to make them all independent. Before there were
    identical array indexes in the inner and the outer loop. We want to
    avoid this special case as it may lead to confusion.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202973 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/LangRef.rst b/docs/LangRef.rst
index 9820fd8a572328c643ffd3a98f7aabfb7d116ca3..2d3b9d5b6f48ecb78e8b3d4cb3e2a0b3fda9c687 100644 (file)
--- a/docs/LangRef.rst
+++ b/docs/LangRef.rst
@@ -2792,9 +2792,9 @@ metadata types that refer to the same loop identifier metadata.
 
    for.body:
      ...
-     %0 = load i32* %arrayidx, align 4, !llvm.mem.parallel_loop_access !0
+     %val0 = load i32* %arrayidx, !llvm.mem.parallel_loop_access !0
      ...
-     store i32 %0, i32* %arrayidx4, align 4, !llvm.mem.parallel_loop_access !0
+     store i32 %val0, i32* %arrayidx1, !llvm.mem.parallel_loop_access !0
      ...
      br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !0
 
@@ -2809,21 +2809,22 @@ the loop identifier metadata node directly:
 .. code-block:: llvm
 
    outer.for.body:
-   ...
+     ...
+     %val1 = load i32* %arrayidx3, !llvm.mem.parallel_loop_access !2
+     ...
+     br label %inner.for.body
 
    inner.for.body:
      ...
-     %0 = load i32* %arrayidx, align 4, !llvm.mem.parallel_loop_access !0
+     %val0 = load i32* %arrayidx1, !llvm.mem.parallel_loop_access !0
      ...
-     store i32 %0, i32* %arrayidx4, align 4, !llvm.mem.parallel_loop_access !0
+     store i32 %val0, i32* %arrayidx2, !llvm.mem.parallel_loop_access !0
      ...
      br i1 %exitcond, label %inner.for.end, label %inner.for.body, !llvm.loop !1
 
    inner.for.end:
      ...
-     %0 = load i32* %arrayidx, align 4, !llvm.mem.parallel_loop_access !0
-     ...
-     store i32 %0, i32* %arrayidx4, align 4, !llvm.mem.parallel_loop_access !0
+     store i32 %val1, i32* %arrayidx4, !llvm.mem.parallel_loop_access !2
      ...
      br i1 %exitcond, label %outer.for.end, label %outer.for.body, !llvm.loop !2