[PATCH] D107630: [docs][GlobalISel]Adding info for G_JUMP_TABLE generic opcode
PoojaYadav via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Aug 19 08:59:30 PDT 2021
pooja2299 updated this revision to Diff 367521.
pooja2299 added a comment.
Removed the redundant line.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D107630/new/
https://reviews.llvm.org/D107630
Files:
llvm/docs/GlobalISel/GenericOpcode.rst
Index: llvm/docs/GlobalISel/GenericOpcode.rst
===================================================================
--- llvm/docs/GlobalISel/GenericOpcode.rst
+++ llvm/docs/GlobalISel/GenericOpcode.rst
@@ -798,9 +798,18 @@
G_JUMP_TABLE
^^^^^^^^^^^^
-.. caution::
+Generates a pointer to the address of the jump table specified by the source
+operand. The source operand is a jump table index. A jump table is an array
+of addresses the CPU should jump to based on certain conditions.
+G_JUMP_TABLE can be used in conjunction with G_BRJT to support jump table
+codegen with GlobalISel.
+
+.. code-block:: none
+
+ %dst:_(p0) = G_JUMP_TABLE %jump-table.0
+
+The above example generates a pointer to the source jump table index.
- I found no documentation for this instruction at the time of writing.
G_INTRINSIC, G_INTRINSIC_W_SIDE_EFFECTS
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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