[clang] b20360a - clang driver: enable fast unaligned access for Android on RISCV64 (#85704)

[via cfe-commits]

Author: AdityaK
Date: 2024-03-20T10:15:23-07:00
New Revision: b20360abeb3a80281dc082f1e093abd13cb1ee4c

URL: https://github.com/llvm/llvm-project/commit/b20360abeb3a80281dc082f1e093abd13cb1ee4c
DIFF: https://github.com/llvm/llvm-project/commit/b20360abeb3a80281dc082f1e093abd13cb1ee4c.diff

LOG: clang driver: enable fast unaligned access for Android on RISCV64 (#85704)

Android CTS test already requires fast unaligned access
https://android-review.googlesource.com/c/platform/cts/+/2675633

Added: 
    

Modified: 
    clang/lib/Driver/ToolChains/Arch/RISCV.cpp
    clang/test/Driver/riscv-features.c

Removed: 
    


################################################################################
diff  --git a/clang/lib/Driver/ToolChains/Arch/RISCV.cpp b/clang/lib/Driver/ToolChains/Arch/RISCV.cpp
index 5165bccc6d7e30..b1dd7c4372d475 100644
--- a/clang/lib/Driver/ToolChains/Arch/RISCV.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/RISCV.cpp
@@ -167,6 +167,10 @@ void riscv::getRISCVTargetFeatures(const Driver &D, const llvm::Triple &Triple,
     Features.push_back("-relax");
   }
 
+  // Android requires fast unaligned access on RISCV64.
+  if (Triple.isAndroid())
+    Features.push_back("+fast-unaligned-access");
+
   // -mstrict-align is default, unless -mno-strict-align is specified.
   AddTargetFeature(Args, Features, options::OPT_mno_strict_align,
                    options::OPT_mstrict_align, "fast-unaligned-access");

diff  --git a/clang/test/Driver/riscv-features.c b/clang/test/Driver/riscv-features.c
index fe74ac773ef8ca..052956dfa2dcea 100644
--- a/clang/test/Driver/riscv-features.c
+++ b/clang/test/Driver/riscv-features.c
@@ -1,7 +1,9 @@
 // RUN: %clang --target=riscv32-unknown-elf -### %s -fsyntax-only 2>&1 | FileCheck %s
 // RUN: %clang --target=riscv64-unknown-elf -### %s -fsyntax-only 2>&1 | FileCheck %s
-// RUN: %clang --target=riscv64-linux-android -### %s -fsyntax-only 2>&1 | FileCheck %s -check-prefixes=ANDROID,DEFAULT
-// RUN: %clang -mabi=lp64d --target=riscv64-linux-android -### %s -fsyntax-only 2>&1 | FileCheck %s -check-prefixes=ANDROID,DEFAULT
+// RUN: %clang --target=riscv64-linux-android -### %s -fsyntax-only 2>&1 | FileCheck %s -check-prefixes=ANDROID,DEFAULT,FAST-UNALIGNED-ACCESS
+// RUN: %clang -mabi=lp64d --target=riscv64-linux-android -### %s -fsyntax-only 2>&1 | FileCheck %s -check-prefixes=ANDROID,DEFAULT,FAST-UNALIGNED-ACCESS
+// RUN: %clang -mabi=lp64d --target=riscv64-linux-android -mstrict-align -### %s -fsyntax-only 2>&1 | FileCheck %s -check-prefixes=NO-FAST-UNALIGNED-ACCESS
+
 
 // CHECK: fno-signed-char