[llvm] [RISCV] Simplify the description for ssaia and smaia. (PR #77870)

[Craig Topper via llvm-commits]

https://github.com/topperc created https://github.com/llvm/llvm-project/pull/77870

It feels more important to expand out Advanced Interrupt Architecture for users than to have a description that explains how one extension is different from the other.

>From 771c1897b11916e40ff4e05337f2265c30f1a506 Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper at sifive.com>
Date: Thu, 11 Jan 2024 19:49:05 -0800
Subject: [PATCH] [RISCV] Simplify the description for ssaia and smaia.

It feels more important to expand out Advanced Interrupt Architecture
for users than to have a description that explains how one extension is
different from the other.
---
 llvm/lib/Target/RISCV/RISCVFeatures.td | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/llvm/lib/Target/RISCV/RISCVFeatures.td b/llvm/lib/Target/RISCV/RISCVFeatures.td
index 4c99d8ce61ef02..72b9c2cade62c7 100644
--- a/llvm/lib/Target/RISCV/RISCVFeatures.td
+++ b/llvm/lib/Target/RISCV/RISCVFeatures.td
@@ -711,16 +711,13 @@ def NoHasStdExtZicfiss : Predicate<"!Subtarget->hasStdExtZicfiss()">;
 
 def FeatureStdExtSmaia
     : SubtargetFeature<"smaia", "HasStdExtSmaia", "true",
-                       "'Smaia' (Smaia encompasses all added CSRs and all "
-                       "modifications to interrupt response behavior that the "
-                       "AIA specifies for a hart, over all privilege levels.)",
-                       []>;
+                       "'Smaia' (Advanced Interrupt Architecture Machine "
+                       "Level)", []>;
 
 def FeatureStdExtSsaia
     : SubtargetFeature<"ssaia", "HasStdExtSsaia", "true",
-                       "'Ssaia' (Ssaia is essentially the same as Smaia except "
-                       "excluding the machine-level CSRs and behavior not "
-                       "directly visible to supervisor level.)", []>;
+                       "'Ssaia' (Advanced Interrupt Architecture Supervisor "
+                       "Level)", []>;
 
 def HasHalfFPLoadStoreMove
     : Predicate<"Subtarget->hasHalfFPLoadStoreMove()">,