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 3441907b6c182e3d95dc40b38a9eec9b52f42417..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
@@ -1596,7 +1583,7 @@ GLSL ISA
 
 These opcodes are part of :term:`GLSL`'s opcode set. Support for these
 opcodes is determined by a special capability bit, ``GLSL``.
-Some require glsl version 1.30 (UIF/BREAKC/SWITCH/CASE/DEFAULT/ENDSWITCH).
+Some require glsl version 1.30 (UIF/SWITCH/CASE/DEFAULT/ENDSWITCH).
 
 .. opcode:: CAL - Subroutine Call
 
@@ -1652,20 +1639,6 @@ Some require glsl version 1.30 (UIF/BREAKC/SWITCH/CASE/DEFAULT/ENDSWITCH).
   or switch/endswitch.
 
 
-.. opcode:: BREAKC - Break Conditional
-
-  Conditionally moves the point of execution to the instruction after the
-  next endloop or endswitch. The instruction must appear within a loop/endloop
-  or switch/endswitch.
-  Condition evaluates to true if src0.x != 0 where src0.x is interpreted
-  as an integer register.
-
-.. note::
-
-   Considered for removal as it's quite inconsistent wrt other opcodes
-   (could emulate with UIF/BRK/ENDIF). 
-
-
 .. opcode:: IF - Float If
 
   Start an IF ... ELSE .. ENDIF block.  Condition evaluates to true if
@@ -1789,7 +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::
 
@@ -1865,17 +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
 
@@ -1886,7 +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
 
@@ -2226,9 +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
 
@@ -3424,7 +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.