Mesa (main): pan/va: Rename RSCALE to LDEXP

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Module: Mesa
Branch: main
Commit: 21bedd2c97194d3cf8281f99cc9bd337e1510816
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=21bedd2c97194d3cf8281f99cc9bd337e1510816

Author: Alyssa Rosenzweig <alyssa at collabora.com>
Date:   Fri Jun 17 11:34:51 2022 -0400

pan/va: Rename RSCALE to LDEXP

This avoids needless variation from Bifrost. While at it, fix the opcode
definition: there are no abs/neg/swizzle modifiers on the signed integer source,
and there's no clamp. However, there are round and infinity modes, like on
Bifrost.

Signed-off-by: Alyssa Rosenzweig <alyssa at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17101>

---

 src/panfrost/bifrost/valhall/ISA.xml | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/src/panfrost/bifrost/valhall/ISA.xml b/src/panfrost/bifrost/valhall/ISA.xml
index 71677fe6ce1..a5e35f9f572 100644
--- a/src/panfrost/bifrost/valhall/ISA.xml
+++ b/src/panfrost/bifrost/valhall/ISA.xml
@@ -1763,18 +1763,19 @@
     <src absneg="true">B</src>
   </group>
 
-  <group name="FRSCALE" title="Floating-point rescaling" dests="1" opcode2="6" unit="FMA">
-    <ins name="FRSCALE.f32" opcode="0xA4"/>
-    <ins name="FRSCALE.v2f16" opcode="0xA5"/>
+  <group name="LDEXP" title="Floating-point rescaling" dests="1" opcode2="6" unit="FMA">
+    <ins name="LDEXP.f32" opcode="0xA4"/>
+    <ins name="LDEXP.v2f16" opcode="0xA5"/>
     <desc>
       Computes $A \cdot 2^B$ by adding B to the exponent of A. Used to calculate
       various special functions, particularly base-2 exponents. Special case
       handling differs from an actual floating-point multiply, so this should
       not be used outside fixed instruction sequences.
     </desc>
-    <clamp/>
     <src absneg="true" swizzle="true">A</src>
-    <src absneg="true" swizzle="true">B</src>
+    <src/>
+    <roundmode/> <!-- Also has rtna -->
+    <!-- Also has infinity handling for arctan -->
   </group>
 
   <ins name="FEXP.f32" title="Floating-point exponent" dests="1" opcode="0xA4" opcode2="8" unit="SFU">
@@ -2648,7 +2649,7 @@
       special transcendental function sequences. It should not be used for
       general code as its special case handling differs from two back-to-back
       `FMA.f32` operations. Equivalent to `FMA.f32` back-to-back with
-      `RSCALE.f32`
+      `LDEXP.f32`
     </desc>
     <clamp/>
     <src absneg="true">A</src>
@@ -2664,7 +2665,7 @@
       ordinary multiply would return NaN. Used in special transcendental
       function sequences. It should not be used for general code as its special
       case handling differs from two back-to-back `FMA.f32` operations.
-      Equivalent to `FMA.f32` back-to-back with `RSCALE.f32`
+      Equivalent to `FMA.f32` back-to-back with `LDEXP.f32`
     </desc>
     <clamp/>
     <src absneg="true">A</src>
@@ -2680,7 +2681,7 @@
       ordinary multiply would return NaN. Used in special transcendental
       function sequences. It should not be used for general code as its special
       case handling differs from two back-to-back `FMA.f32` operations.
-      Equivalent to `FMA.f32` back-to-back with `RSCALE.f32`
+      Equivalent to `FMA.f32` back-to-back with `LDEXP.f32`
     </desc>
     <clamp/>
     <src absneg="true">A</src>
@@ -2695,7 +2696,7 @@
       interpreted as a 16-bit value. Used in special transcendental function
       sequences. It should not be used for general code as its special case
       handling differs from two back-to-back `FMA.f32` operations.  Equivalent
-      to `FMA.f32` back-to-back with `RSCALE.f32`
+      to `FMA.f32` back-to-back with `LDEXP.f32`
     </desc>
     <clamp/>
     <src absneg="true">A</src>