tgsi: fix the documentation of DLDEXP

Sourcing the exponent for the zw destination pair from Z is consistent
with both tgsi_exec and gallivm. In practice, st_glsl_to_tgsi always
generates per-channel instructions anyway.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>

diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index 0bd9964a9855023d57276a85943c7303e1b3e726..8633c929b9f737e4935eb697aa01e9ed2150733c 100644 (file)
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -1859,7 +1859,7 @@ source is an integer.
 
   dst.xy = src0.xy \times 2^{src1.x}
 
-  dst.zw = src0.zw \times 2^{src1.y}
+  dst.zw = src0.zw \times 2^{src1.z}
 
 .. opcode:: DMIN - Minimum