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authorDave Airlie <[email protected]>2014-08-14 18:38:51 +1000
committerDave Airlie <[email protected]>2015-02-20 08:49:12 +1000
commit3cd1338534374c8ed13651548dcbf3949857dbcd (patch)
tree95836bf4ab683aa3d38684421ad173ac0ed711b4 /src/gallium/docs
parent14b9bf630c23ad060ea8bd12da2f7b18cb4f4101 (diff)
gallium: add double opcodes and TGSI execution (v4.2)
This patch adds support for a set of double opcodes to TGSI. It is an update of work done originally by Michal Krol on the gallium-double-opcodes branch. The opcodes have a hint where they came from in the header file. v2: add unsigned/int <-> double v2.1: update docs. v3: add DRSQ (Glenn), fix review comments (Glenn). v4: drop DDIV v4.1: cleanups, fix some docs bugs, (Ilia) rework store_dest and fetch_source fns. (Ilia) 4.2: fixup float comparisons (Ilia) This is based on code by Michael Krol <[email protected]> Roland and Glenn also reviewed earlier versions. Reviewed-by: Ilia Mirkin <[email protected]> Signed-off-by: Dave Airlie <[email protected]>
Diffstat (limited to 'src/gallium/docs')
-rw-r--r--src/gallium/docs/source/tgsi.rst92
1 files changed, 79 insertions, 13 deletions
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index 84b0ed60a80..e20af79d9f3 100644
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -1808,7 +1808,10 @@ Double ISA
The double-precision opcodes reinterpret four-component vectors into
two-component vectors with doubled precision in each component.
-Support for these opcodes is XXX undecided. :T
+.. opcode:: DABS - Absolute
+
+ dst.xy = |src0.xy|
+ dst.zw = |src0.zw|
.. opcode:: DADD - Add
@@ -1818,30 +1821,37 @@ Support for these opcodes is XXX undecided. :T
dst.zw = src0.zw + src1.zw
-
-.. opcode:: DDIV - Divide
+.. opcode:: DSEQ - Set on Equal
.. math::
- dst.xy = src0.xy / src1.xy
+ dst.x = src0.xy == src1.xy ? \sim 0 : 0
- dst.zw = src0.zw / src1.zw
+ dst.z = src0.zw == src1.zw ? \sim 0 : 0
-.. opcode:: DSEQ - Set on Equal
+.. opcode:: DSNE - Set on Equal
.. math::
- dst.xy = src0.xy == src1.xy ? 1.0F : 0.0F
+ dst.x = src0.xy != src1.xy ? \sim 0 : 0
- dst.zw = src0.zw == src1.zw ? 1.0F : 0.0F
+ dst.z = src0.zw != src1.zw ? \sim 0 : 0
.. opcode:: DSLT - Set on Less than
.. math::
- dst.xy = src0.xy < src1.xy ? 1.0F : 0.0F
+ dst.x = src0.xy < src1.xy ? \sim 0 : 0
+
+ dst.z = src0.zw < src1.zw ? \sim 0 : 0
- dst.zw = src0.zw < src1.zw ? 1.0F : 0.0F
+.. opcode:: DSGE - Set on Greater equal
+
+.. math::
+
+ dst.x = src0.xy >= src1.xy ? \sim 0 : 0
+
+ dst.z = src0.zw >= src1.zw ? \sim 0 : 0
.. opcode:: DFRAC - Fraction
@@ -1870,13 +1880,14 @@ exponent of its source to ``dst0``, and the significand to ``dst1``, such that
.. opcode:: DLDEXP - Multiply Number by Integral Power of 2
-This opcode is the inverse of :opcode:`DFRACEXP`.
+This opcode is the inverse of :opcode:`DFRACEXP`. The second
+source is an integer.
.. math::
- dst.xy = src0.xy \times 2^{src1.xy}
+ dst.xy = src0.xy \times 2^{src1.x}
- dst.zw = src0.zw \times 2^{src1.zw}
+ dst.zw = src0.zw \times 2^{src1.y}
.. opcode:: DMIN - Minimum
@@ -1928,6 +1939,61 @@ This opcode is the inverse of :opcode:`DFRACEXP`.
dst.zw = \sqrt{src.zw}
+.. opcode:: DRSQ - Reciprocal Square Root
+
+.. math::
+
+ dst.xy = \frac{1}{\sqrt{src.xy}}
+
+ dst.zw = \frac{1}{\sqrt{src.zw}}
+
+.. opcode:: F2D - Float to Double
+
+.. math::
+
+ dst.xy = double(src0.x)
+
+ dst.zw = double(src0.y)
+
+.. opcode:: D2F - Double to Float
+
+.. math::
+
+ dst.x = float(src0.xy)
+
+ dst.y = float(src0.zw)
+
+.. opcode:: I2D - Int to Double
+
+.. math::
+
+ dst.xy = double(src0.x)
+
+ dst.zw = double(src0.y)
+
+.. opcode:: D2I - Double to Int
+
+.. math::
+
+ dst.x = int(src0.xy)
+
+ dst.y = int(src0.zw)
+
+.. opcode:: U2D - Unsigned Int to Double
+
+.. math::
+
+ dst.xy = double(src0.x)
+
+ dst.zw = double(src0.y)
+
+.. opcode:: D2U - Double to Unsigned Int
+
+.. math::
+
+ dst.x = unsigned(src0.xy)
+
+ dst.y = unsigned(src0.zw)
.. _samplingopcodes: