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| author | Nuno Lopes <nunoplopes@sapo.pt> | 2012-05-22 15:25:31 +0000 |
|---|---|---|
| committer | Nuno Lopes <nunoplopes@sapo.pt> | 2012-05-22 15:25:31 +0000 |
| commit | 23e75da7e0622528be3c3908b5fe3ae8857cdf65 (patch) | |
| tree | 953e680c141920c0bb5b29a2edfcbcf084614ddd /docs | |
| parent | 76ff7418361c1c80ce9d018bce63511a70bd7390 (diff) | |
| download | external_llvm-23e75da7e0622528be3c3908b5fe3ae8857cdf65.zip external_llvm-23e75da7e0622528be3c3908b5fe3ae8857cdf65.tar.gz external_llvm-23e75da7e0622528be3c3908b5fe3ae8857cdf65.tar.bz2 | |
revert my previous patches that introduced an additional parameter to the objectsize intrinsic.
After a lot of discussion, we realized it's not the best option for run-time bounds checking
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157255 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/LangRef.html | 20 |
1 files changed, 8 insertions, 12 deletions
diff --git a/docs/LangRef.html b/docs/LangRef.html index b9c8746..8f7a17c 100644 --- a/docs/LangRef.html +++ b/docs/LangRef.html @@ -8467,8 +8467,8 @@ LLVM</a>.</p> <h5>Syntax:</h5> <pre> - declare i32 @llvm.objectsize.i32(i8* <object>, i1 <min>, i32 <runtime>) - declare i64 @llvm.objectsize.i64(i8* <object>, i1 <min>, i32 <runtime>) + declare i32 @llvm.objectsize.i32(i8* <object>, i1 <min>) + declare i64 @llvm.objectsize.i64(i8* <object>, i1 <min>) </pre> <h5>Overview:</h5> @@ -8479,21 +8479,17 @@ LLVM</a>.</p> an allocation of a specific class, structure, array, or other object.</p> <h5>Arguments:</h5> -<p>The <tt>llvm.objectsize</tt> intrinsic takes three arguments. The first +<p>The <tt>llvm.objectsize</tt> intrinsic takes two arguments. The first argument is a pointer to or into the <tt>object</tt>. The second argument - is a boolean and determines whether <tt>llvm.objectsize</tt> returns 0 (if true) - or -1 (if false) when the object size is unknown. - The third argument, <tt>runtime</tt>, indicates whether the compiler is allowed - to return a non-constant value. The higher the value, the higher the potential - run-time performance impact. - The second and third arguments only accepts constants.</p> + is a boolean and determines whether <tt>llvm.objectsize</tt> returns 0 (if + true) or -1 (if false) when the object size is unknown. + The second argument only accepts constants.</p> <h5>Semantics:</h5> <p>The <tt>llvm.objectsize</tt> intrinsic is lowered to a constant representing the size of the object concerned. If the size cannot be determined at compile - time, <tt>llvm.objectsize</tt> either returns <tt>i32/i64 -1 or 0</tt> - (depending on the <tt>min</tt> argument) if <tt>runtime</tt> is 0, or a run-time - value (if <tt>runtime</tt> > 0 and an expression could be generated).</p> + time, <tt>llvm.objectsize</tt> returns <tt>i32/i64 -1 or 0</tt> + (depending on the <tt>min</tt> argument).</p> </div> <!-- _______________________________________________________________________ --> |