[clang] a1b6e7f - [clang][LoongArch] Ensure `target("lasx")` implies LSX support (#153542)

[via cfe-commits]

Author: Ami-zhang
Date: 2025-08-15T09:53:08+08:00
New Revision: a1b6e7ff393533a5c4f3bdfd4efe5da106e2de2b

URL: https://github.com/llvm/llvm-project/commit/a1b6e7ff393533a5c4f3bdfd4efe5da106e2de2b
DIFF: https://github.com/llvm/llvm-project/commit/a1b6e7ff393533a5c4f3bdfd4efe5da106e2de2b.diff

LOG: [clang][LoongArch] Ensure `target("lasx")` implies LSX support (#153542)

Currently, `__attribute__((target("lasx")))` does not automatically
enable LSX support, causing Clang to fail with `-mno-lsx`. Since
LASX depends on LSX, enabling LASX should implicitly enable LSX to
avoid clang error.
    
Fixes #149512.

Depends on #153541

Added: 
    

Modified: 
    clang/lib/Basic/Targets/LoongArch.cpp
    clang/test/CodeGen/LoongArch/targetattr-lasx.c

Removed: 
    


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diff  --git a/clang/lib/Basic/Targets/LoongArch.cpp b/clang/lib/Basic/Targets/LoongArch.cpp
index f6915df1520b7..8e29bb745734b 100644
--- a/clang/lib/Basic/Targets/LoongArch.cpp
+++ b/clang/lib/Basic/Targets/LoongArch.cpp
@@ -461,6 +461,8 @@ LoongArchTargetInfo::parseTargetAttr(StringRef Features) const {
 
     case AttrFeatureKind::Feature:
       Ret.Features.push_back("+" + Value.str());
+      if (Value == "lasx")
+        Ret.Features.push_back("+lsx");
       break;
     }
   }

diff  --git a/clang/test/CodeGen/LoongArch/targetattr-lasx.c b/clang/test/CodeGen/LoongArch/targetattr-lasx.c
index f4857406180a2..56fd6573ed34c 100644
--- a/clang/test/CodeGen/LoongArch/targetattr-lasx.c
+++ b/clang/test/CodeGen/LoongArch/targetattr-lasx.c
@@ -4,4 +4,4 @@ __attribute__((target("lasx")))
 // CHECK: #[[ATTR0:[0-9]+]] {
 void testlasx() {}
 
-// CHECK: attributes #[[ATTR0]] = { {{.*}}"target-features"="+64bit,+lasx,-lsx"{{.*}} }
+// CHECK: attributes #[[ATTR0]] = { {{.*}}"target-features"="+64bit,+lasx,+lsx"{{.*}} }