emphasise scaling is hardware not ISA for SVE2

diff --git a/openpower/sv/comparison_table.mdwn b/openpower/sv/comparison_table.mdwn
index aa6cb4dfd8f91dc6e60168cce3bbdec8c31c17fa..e232e5cfc2e1c805a4ca095a438a22e04ea33353 100644 (file)
--- a/openpower/sv/comparison_table.mdwn
+++ b/openpower/sv/comparison_table.mdwn
@@ -4,7 +4,7 @@
 | Draft SVP64    | 5 (1)           | Scalable (2)          | yes                  | yes (3)               | no (4)                     | see (5) | yes (6)                | yes (7)               | yes (8)                        | yes (9)               | yes (10)              |
 | VSX            | 700+            | Packed SIMD           | no                   | no                    | yes (11)                   | yes     | no                     | no                    | no                             | no                    | yes (12)              |
 | NEON           | ~250 (13)       | Predicated SIMD       | yes                  | no                    | yes                        | yes     | no                     | no                    | no                             | no                    | no                    |
-| SVE2           | ~1000 (14)      | Scalable HW (15)      | yes                  | no                    | yes                        | yes     | no                     | yes (7)               | no                             | no                    | no                    |
+| SVE2           | ~1000 (14)      | Scalable HW only (15) | yes                  | no                    | yes                        | yes     | no                     | yes (7)               | no                             | no                    | no                    |
 | AVX-512 (16)   | ~1000s (17)     | Predicated SIMD       | yes                  | no                    | yes                        | yes     | no                     | no                    | no                             | no                    | no                    |
 | RVV (18)       | ~190            | Scalable (19)         | yes                  | no                    | yes                        | yes (20)| no                     | yes                   | no                             | no                    | no                    |
 | Aurora SX (21) | ~200 (22)       | Scalable (23)         | yes                  | no                    | yes                        | no      | no                     | no                    | no                             | no                    | no                    |
@@ -25,7 +25,7 @@
   Critically depends on ARM Scalar instructions
 * (14): difficult to exactly ascertain, see ARM Architecture Reference Manual Supplement, DDI 0584.  Critically depends on ARM Scalar instructions.
 * (15): ARM states that the Scalability is a [Silicon-partner choice](https://developer.arm.com/-/media/Arm%20Developer%20Community/PDF/102340_0001_00_en_introduction-to-sve2.pdf?revision=aae96dd2-5334-4ad3-9a47-393086a20fea).
-  this "Scalability independence" is not entirely extended in full to the programmer although ARM requests developers to consider it so, in practice this does not happen.
+  Scalability in the ISA is **not available to the programmer**: there is no `setvl` instruction in SVE2, which is already causing assembler programmer difficulties.
 * (16): [Wikipedia](https://en.wikipedia.org/wiki/AVX-512), [Lifecycle of an instruction set](https://media.handmade-seattle.com/tom-forsyth/) including full slides
 * (17): difficult to exactly ascertain, contains subsets. Critically depends on ISA support from earlier x86 ISA subsets (several more thousand instructions). See [SIMD ISA listing](https://www.officedaytime.com/simd512e/)
 * (18): [RVV Spec](https://github.com/riscv/riscv-v-spec/blob/master/v-spec.adoc)