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| author | Frits van Bommel <fvbommel@gmail.com> | 2010-12-05 20:54:38 +0000 |
|---|---|---|
| committer | Frits van Bommel <fvbommel@gmail.com> | 2010-12-05 20:54:38 +0000 |
| commit | 1324289d24a1c86c9e12c590218db42814ab0225 (patch) | |
| tree | a703b21e218c255b05a02297f5cf3252f5ef0ac4 /docs | |
| parent | a4805cf6efbcd405916cdd0eb4b6170231e906c7 (diff) | |
Clarify some of the differences between indexing with getelementptr and indexing with insertvalue/extractvalue.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120957 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/LangRef.html | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/docs/LangRef.html b/docs/LangRef.html index 68d65f1a97..76fa06f49c 100644 --- a/docs/LangRef.html +++ b/docs/LangRef.html @@ -4131,6 +4131,14 @@ Instruction</a> </div> <a href="#t_array">array</a> type. The operands are constant indices to specify which value to extract in a similar manner as indices in a '<tt><a href="#i_getelementptr">getelementptr</a></tt>' instruction.</p> + <p>The major differences to <tt>getelementptr</tt> indexing are:</p> + <ul> + <li>Since the value being indexed is not a pointer, the first index is + omitted and assumed to be zero.</li> + <li>At least one index must be specified.</li> + <li>Not only struct indices but also array indices must be in + bounds.</li> + </ul> <h5>Semantics:</h5> <p>The result is the value at the position in the aggregate specified by the @@ -4165,7 +4173,7 @@ Instruction</a> </div> <a href="#t_array">array</a> type. The second operand is a first-class value to insert. The following operands are constant indices indicating the position at which to insert the value in a similar manner as indices in a - '<tt><a href="#i_getelementptr">getelementptr</a></tt>' instruction. The + '<tt><a href="#i_extractvalue">extractvalue</a></tt>' instruction. The value to insert must have the same type as the value identified by the indices.</p> |