[PATCH] D84021: [Driver] Add suppoort for -msve-vector-bits=scalable.

[Paul Walker via Phabricator via cfe-commits]

paulwalker-arm created this revision.
Herald added subscribers: cfe-commits, tschuett.
Herald added a project: clang.

No real action is taken for a value of scalable but it provides a
route to disable an earlier specification and is effectively its
default value when omitted.

Patch also removes an "unused variable" warning.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D84021

Files:
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/Driver/ToolChains/Arch/AArch64.cpp
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/test/Driver/aarch64-sve-vector-bits.c


Index: clang/test/Driver/aarch64-sve-vector-bits.c
===================================================================
--- clang/test/Driver/aarch64-sve-vector-bits.c
+++ clang/test/Driver/aarch64-sve-vector-bits.c
@@ -12,12 +12,15 @@
 // RUN:  -msve-vector-bits=1024 2>&1 | FileCheck --check-prefix=CHECK-1024 %s
 // RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
 // RUN:  -msve-vector-bits=2048 2>&1 | FileCheck --check-prefix=CHECK-2048 %s
+// RUN: %clang -c %s -### -target aarch64-none-linux-gnu -march=armv8-a+sve \
+// RUN:  -msve-vector-bits=scalable 2>&1 | FileCheck --check-prefix=CHECK-SCALABLE %s
 
 // CHECK-128: "-msve-vector-bits=128"
 // CHECK-256: "-msve-vector-bits=256"
 // CHECK-512: "-msve-vector-bits=512"
 // CHECK-1024: "-msve-vector-bits=1024"
 // CHECK-2048: "-msve-vector-bits=2048"
+// CHECK-SCALABLE-NOT: "-msve-vector-bits=
 
 // Bail out if -msve-vector-bits is specified without SVE enabled
 // -----------------------------------------------------------------------------
@@ -47,11 +50,13 @@
 // -----------------------------------------------------------------------------
 // RUN: not %clang -c %s -o /dev/null -target aarch64-none-linux-gnu \
 // RUN:  -march=armv8-a+sve 2>&1 | FileCheck --check-prefix=CHECK-NO-FLAG-ERROR %s
+// RUN: not %clang -c %s -o /dev/null -target aarch64-none-linux-gnu \
+// RUN:  -march=armv8-a+sve -msve-vector-bits=scalable 2>&1 | FileCheck --check-prefix=CHECK-NO-FLAG-ERROR %s
 
 typedef __SVInt32_t svint32_t;
 typedef svint32_t noflag __attribute__((arm_sve_vector_bits(256)));
 
-// CHECK-NO-FLAG-ERROR: error: 'arm_sve_vector_bits' is not supported when '-msve-vector-bits=<bits>' is not specified
+// CHECK-NO-FLAG-ERROR: error: 'arm_sve_vector_bits' is only supported when '-msve-vector-bits=<bits>' is specified with a value of 128, 256, 512, 1024 or 2048
 
 // Error if attribute vector size != -msve-vector-bits
 // -----------------------------------------------------------------------------
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -1720,15 +1720,15 @@
   if (Arg *A = Args.getLastArg(options::OPT_msve_vector_bits_EQ)) {
     StringRef Val = A->getValue();
     const Driver &D = getToolChain().getDriver();
-    if (!Val.equals("128") && !Val.equals("256") && !Val.equals("512") &&
-        !Val.equals("1024") && !Val.equals("2048")) {
+    if (Val.equals("128") || Val.equals("256") || Val.equals("512") ||
+        Val.equals("1024") || Val.equals("2048"))
+      CmdArgs.push_back(
+          Args.MakeArgString(llvm::Twine("-msve-vector-bits=") + Val));
+    // Silently drop requests for vector-length agnostic code as it's implied.
+    else if (!Val.equals("scalable"))
       // Handle the unsupported values passed to msve-vector-bits.
       D.Diag(diag::err_drv_unsupported_option_argument)
           << A->getOption().getName() << Val;
-    } else if (A->getOption().matches(options::OPT_msve_vector_bits_EQ)) {
-      CmdArgs.push_back(
-          Args.MakeArgString(llvm::Twine("-msve-vector-bits=") + Val));
-    }
   }
 }
 
Index: clang/lib/Driver/ToolChains/Arch/AArch64.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Arch/AArch64.cpp
+++ clang/lib/Driver/ToolChains/Arch/AArch64.cpp
@@ -370,8 +370,8 @@
     V8_6Pos = Features.insert(std::next(V8_6Pos), {"+i8mm", "+bf16"});
 
   bool HasSve = llvm::is_contained(Features, "+sve");
-  // -msve_vector_bits=<bits> flag is valid only if SVE is enabled.
-  if (Arg *A = Args.getLastArg(options::OPT_msve_vector_bits_EQ))
+  // -msve-vector-bits=<bits> flag is valid only if SVE is enabled.
+  if (Args.hasArg(options::OPT_msve_vector_bits_EQ))
     if (!HasSve)
       D.Diag(diag::err_drv_invalid_sve_vector_bits);
 
Index: clang/include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -2816,7 +2816,8 @@
   "invalid SVE vector size '%0', must match value set by "
   "'-msve-vector-bits' ('%1')">;
 def err_attribute_arm_feature_sve_bits_unsupported : Error<
-  "%0 is not supported when '-msve-vector-bits=<bits>' is not specified">;
+  "%0 is only supported when '-msve-vector-bits=<bits>' is specified with a"
+  " value of 128, 256, 512, 1024 or 2048.">;
 def err_attribute_requires_positive_integer : Error<
   "%0 attribute requires a %select{positive|non-negative}1 "
   "integral compile time constant expression">;


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