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-rw-r--r--src/gallium/docs/source/tgsi.rst21
1 files changed, 17 insertions, 4 deletions
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index 0002626c715..b7180f85df4 100644
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -864,19 +864,32 @@ This instruction replicates its result.
TBD
-.. opcode:: IF - If
+.. opcode:: IF - Float If
- TBD
+ Start an IF ... ELSE .. ENDIF block. Condition evaluates to true if
+
+ src0.x != 0.0
+
+ where src0.x is interpreted as a floating point register.
+
+
+.. opcode:: UIF - Bitwise If
+
+ Start an UIF ... ELSE .. ENDIF block. Condition evaluates to true if
+
+ src0.x != 0
+
+ where src0.x is interpreted as an integer register.
.. opcode:: ELSE - Else
- TBD
+ Starts an else block, after an IF or UIF statement.
.. opcode:: ENDIF - End If
- TBD
+ Ends an IF or UIF block.
.. opcode:: PUSHA - Push Address Register On Stack