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Line up the comments in a code example.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145908 91177308-0d34-0410-b5e6-96231b3b80d8
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Dan Gohman
2011-12-06 03:31:14 +00:00
parent bfb056dccf
commit 5cdc51ea7b
1 changed files with 19 additions and 19 deletions
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@@ -2582,11 +2582,11 @@ b: unreachable
<pre class="doc_code"> <pre class="doc_code">
entry: entry:
%poison = sub nuw i32 0, 1 ; Results in a poison value. %poison = sub nuw i32 0, 1 ; Results in a poison value.
%still_poison = and i32 %poison, 0 ; Whereas (and i32 undef, 0) would return 0. %still_poison = and i32 %poison, 0 ; Whereas (and i32 undef, 0) would return 0.
%poison_yet_again = getelementptr i32* @h, i32 %still_poison %poison_yet_again = getelementptr i32* @h, i32 %still_poison
store i32 0, i32* %poison_yet_again ; undefined behavior store i32 0, i32* %poison_yet_again ; undefined behavior
store i32 %poison, i32* @g ; Poison value conceptually stored to memory. store i32 %poison, i32* @g ; Poison value conceptually stored to memory.
%poison2 = load i32* @g ; Returns a poison value, not just undef. %poison2 = load i32* @g ; Returns a poison value, not just undef.
store volatile i32 %poison, i32* @g ; External observation; undefined behavior. store volatile i32 %poison, i32* @g ; External observation; undefined behavior.
@@ -2596,38 +2596,38 @@ entry:
%poison3 = load i16* %narrowaddr ; Returns a poison value. %poison3 = load i16* %narrowaddr ; Returns a poison value.
%poison4 = load i64* %wideaddr ; Returns a poison value. %poison4 = load i64* %wideaddr ; Returns a poison value.
%cmp = icmp slt i32 %poison, 0 ; Returns a poison value. %cmp = icmp slt i32 %poison, 0 ; Returns a poison value.
br i1 %cmp, label %true, label %end ; Branch to either destination. br i1 %cmp, label %true, label %end ; Branch to either destination.
true: true:
store volatile i32 0, i32* @g ; This is control-dependent on %cmp, so store volatile i32 0, i32* @g ; This is control-dependent on %cmp, so
; it has undefined behavior. ; it has undefined behavior.
br label %end br label %end
end: end:
%p = phi i32 [ 0, %entry ], [ 1, %true ] %p = phi i32 [ 0, %entry ], [ 1, %true ]
; Both edges into this PHI are ; Both edges into this PHI are
; control-dependent on %cmp, so this ; control-dependent on %cmp, so this
; always results in a poison value. ; always results in a poison value.
store volatile i32 0, i32* @g ; This would depend on the store in %true store volatile i32 0, i32* @g ; This would depend on the store in %true
; if %cmp is true, or the store in %entry ; if %cmp is true, or the store in %entry
; otherwise, so this is undefined behavior. ; otherwise, so this is undefined behavior.
br i1 %cmp, label %second_true, label %second_end br i1 %cmp, label %second_true, label %second_end
; The same branch again, but this time the ; The same branch again, but this time the
; true block doesn't have side effects. ; true block doesn't have side effects.
second_true: second_true:
; No side effects! ; No side effects!
ret void ret void
second_end: second_end:
store volatile i32 0, i32* @g ; This time, the instruction always depends store volatile i32 0, i32* @g ; This time, the instruction always depends
; on the store in %end. Also, it is ; on the store in %end. Also, it is
; control-equivalent to %end, so this is ; control-equivalent to %end, so this is
; well-defined (again, ignoring earlier ; well-defined (again, ignoring earlier
; undefined behavior in this example). ; undefined behavior in this example).
</pre> </pre>
</div> </div>