tgsi: clarify the semantics of DFRACEXP

[mesa.git] / src / gallium / docs / source / tgsi.rst

diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index 08166c394b5164cadf9d7ecbd2dc84649093d921..fd78c40ba3cec388cd606506c040243d1f3b79be 100644 (file)
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -651,19 +651,6 @@ This instruction replicates its result.
   Unconditional discard.  Allowed in fragment shaders only.
 
 
-.. opcode:: SCS - Sine Cosine
-
-.. math::
-
-  dst.x = \cos{src.x}
-
-  dst.y = \sin{src.x}
-
-  dst.z = 0
-
-  dst.w = 1
-
-
 .. opcode:: TXB - Texture Lookup With Bias
 
   for cube map array textures and shadow cube maps, the bias value
@@ -1775,7 +1762,7 @@ two-component vectors with doubled precision in each component.
 
   dst.z = src0.zw == src1.zw ? \sim 0 : 0
 
-.. opcode:: DSNE - Set on Equal
+.. opcode:: DSNE - Set on Not Equal
 
 .. math::
 
@@ -1851,17 +1838,15 @@ two-component vectors with doubled precision in each component.
 
 Like the ``frexp()`` routine in many math libraries, this opcode stores the
 exponent of its source to ``dst0``, and the significand to ``dst1``, such that
-:math:`dst1 \times 2^{dst0} = src` .
+:math:`dst1 \times 2^{dst0} = src` . The results are replicated across
+channels.
 
 .. math::
 
-  dst0.xy = exp(src.xy)
-
-  dst1.xy = frac(src.xy)
+  dst0.xy = dst.zw = frac(src.xy)
 
-  dst0.zw = exp(src.zw)
+  dst1 = frac(src.xy)
 
-  dst1.zw = frac(src.zw)
 
 .. opcode:: DLDEXP - Multiply Number by Integral Power of 2
 
@@ -1872,7 +1857,7 @@ 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
 
@@ -2212,9 +2197,9 @@ two-component vectors with 64-bits in each component.
 
 .. math::
 
-   dst.xy = (uint64_t) src0.x
+   dst.xy = (int64_t) src0.x
 
-   dst.zw = (uint64_t) src0.y
+   dst.zw = (int64_t) src0.y
 
 .. opcode:: I2I64 - Signed Integer to 64-bit Integer
 
@@ -3410,7 +3395,7 @@ A bit mask of ``bit index <= TGSI_SEMANTIC_SUBGROUP_INVOCATION``, i.e.
 TGSI_SEMANTIC_SUBGROUP_LT_MASK
 """"""""""""""""""""""""""""""
 
-A bit mask of ``bit index > TGSI_SEMANTIC_SUBGROUP_INVOCATION``, i.e.
+A bit mask of ``bit index < TGSI_SEMANTIC_SUBGROUP_INVOCATION``, i.e.
 ``(1 << subgroup_invocation) - 1`` in arbitrary precision arithmetic.