[llvm] 7b2eff6 - [AArch64] Add FeatureFuseAddSub2RegAndConstOne for Ampere1A (#81295)

[via llvm-commits]

Author: Philipp Tomsich
Date: 2024-02-09T15:31:03-08:00
New Revision: 7b2eff6306c1a20f69f16bc485dbc229c8ada40d

URL: https://github.com/llvm/llvm-project/commit/7b2eff6306c1a20f69f16bc485dbc229c8ada40d
DIFF: https://github.com/llvm/llvm-project/commit/7b2eff6306c1a20f69f16bc485dbc229c8ada40d.diff

LOG: [AArch64] Add FeatureFuseAddSub2RegAndConstOne for Ampere1A (#81295)

Ampere1A introduced the Fusion for A+B+1/A-B-1.
However, the Feature flag to enable that fusion-case never was added to
TuneAmpere1A.  This commit corrects that omission.

Added: 
    

Modified: 
    llvm/lib/Target/AArch64/AArch64.td

Removed: 
    


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diff  --git a/llvm/lib/Target/AArch64/AArch64.td b/llvm/lib/Target/AArch64/AArch64.td
index 00833b419ec32c..8f8cc154528096 100644
--- a/llvm/lib/Target/AArch64/AArch64.td
+++ b/llvm/lib/Target/AArch64/AArch64.td
@@ -1372,6 +1372,7 @@ def TuneAmpere1A : SubtargetFeature<"ampere1a", "ARMProcFamily", "Ampere1A",
                                     FeatureFuseAddress,
                                     FeatureFuseLiterals,
                                     FeatureFuseLiterals,
+                                    FeatureFuseAddSub2RegAndConstOne,
                                     FeatureStorePairSuppress,
                                     FeatureLdpAlignedOnly,
                                     FeatureStpAlignedOnly]>;