[clang] 952c8d3 - [AArch64] Enable FEAT_SVE2p1 by default for Armv9.4-A and later (#120753)

[via cfe-commits]

Author: Jonathan Thackray
Date: 2024-12-20T17:27:08Z
New Revision: 952c8d305459d3f1218d1ce12c7f20b6a10ba046

URL: https://github.com/llvm/llvm-project/commit/952c8d305459d3f1218d1ce12c7f20b6a10ba046
DIFF: https://github.com/llvm/llvm-project/commit/952c8d305459d3f1218d1ce12c7f20b6a10ba046.diff

LOG: [AArch64] Enable FEAT_SVE2p1 by default for Armv9.4-A and later (#120753)

The ArmARM says:
```
    "In an Armv9.4 implementation, if FEAT_SVE2 is implemented,
     FEAT_SVE2p1 is implemented."
```
Since FEAT_SVE2 is already enabled for Armv9.0-A and later, then
FEAT_SVE2p1 should also be enabled by default.

Added: 
    

Modified: 
    clang/test/Driver/print-enabled-extensions/aarch64-armv9.4-a.c
    clang/test/Driver/print-enabled-extensions/aarch64-armv9.5-a.c
    llvm/lib/Target/AArch64/AArch64Features.td

Removed: 
    


################################################################################
diff  --git a/clang/test/Driver/print-enabled-extensions/aarch64-armv9.4-a.c b/clang/test/Driver/print-enabled-extensions/aarch64-armv9.4-a.c
index 0032c926c22d96..1cfda6c996b9e3 100644
--- a/clang/test/Driver/print-enabled-extensions/aarch64-armv9.4-a.c
+++ b/clang/test/Driver/print-enabled-extensions/aarch64-armv9.4-a.c
@@ -58,6 +58,7 @@
 // CHECK-NEXT:     FEAT_SSBS, FEAT_SSBS2                                  Enable Speculative Store Bypass Safe bit
 // CHECK-NEXT:     FEAT_SVE                                               Enable Scalable Vector Extension (SVE) instructions
 // CHECK-NEXT:     FEAT_SVE2                                              Enable Scalable Vector Extension 2 (SVE2) instructions
+// CHECK-NEXT:     FEAT_SVE2p1                                            Enable Scalable Vector Extension 2.1 instructions
 // CHECK-NEXT:     FEAT_TLBIOS, FEAT_TLBIRANGE                            Enable Armv8.4-A TLB Range and Maintenance instructions
 // CHECK-NEXT:     FEAT_TRBE                                              Enable Trace Buffer Extension
 // CHECK-NEXT:     FEAT_TRF                                               Enable Armv8.4-A Trace extension

diff  --git a/clang/test/Driver/print-enabled-extensions/aarch64-armv9.5-a.c b/clang/test/Driver/print-enabled-extensions/aarch64-armv9.5-a.c
index be24bd0bbddb68..76c8b34a56b75b 100644
--- a/clang/test/Driver/print-enabled-extensions/aarch64-armv9.5-a.c
+++ b/clang/test/Driver/print-enabled-extensions/aarch64-armv9.5-a.c
@@ -61,6 +61,7 @@
 // CHECK-NEXT:     FEAT_SSBS, FEAT_SSBS2                                  Enable Speculative Store Bypass Safe bit
 // CHECK-NEXT:     FEAT_SVE                                               Enable Scalable Vector Extension (SVE) instructions
 // CHECK-NEXT:     FEAT_SVE2                                              Enable Scalable Vector Extension 2 (SVE2) instructions
+// CHECK-NEXT:     FEAT_SVE2p1                                            Enable Scalable Vector Extension 2.1 instructions
 // CHECK-NEXT:     FEAT_TLBIOS, FEAT_TLBIRANGE                            Enable Armv8.4-A TLB Range and Maintenance instructions
 // CHECK-NEXT:     FEAT_TRBE                                              Enable Trace Buffer Extension
 // CHECK-NEXT:     FEAT_TRF                                               Enable Armv8.4-A Trace extension

diff  --git a/llvm/lib/Target/AArch64/AArch64Features.td b/llvm/lib/Target/AArch64/AArch64Features.td
index 3a6bef81f4a0d8..41eb9a73bd013d 100644
--- a/llvm/lib/Target/AArch64/AArch64Features.td
+++ b/llvm/lib/Target/AArch64/AArch64Features.td
@@ -874,7 +874,7 @@ def HasV9_3aOps : Architecture64<9, 3, "a", "v9.3a",
 def HasV9_4aOps : Architecture64<9, 4, "a", "v9.4a",
   [HasV8_9aOps, HasV9_3aOps],
   !listconcat(HasV9_3aOps.DefaultExts, [FeatureSPECRES2, FeatureCSSC,
-    FeatureRASv2])>;
+    FeatureRASv2, FeatureSVE2p1])>;
 def HasV9_5aOps : Architecture64<9, 5, "a", "v9.5a",
   [HasV9_4aOps, FeatureCPA],
   !listconcat(HasV9_4aOps.DefaultExts, [FeatureCPA,  FeatureLUT, FeatureFAMINMAX])>;