[PATCH] D64048: [TargetParser][ARM] Account dependencies when processing target features

[Alexandros Lamprineas via Phabricator via cfe-commits]

labrinea created this revision.
labrinea added reviewers: llvm-commits, ostannard.
Herald added subscribers: cfe-commits, dmgreen, hiraditya, kristof.beyls, javed.absar.
Herald added projects: clang, LLVM.

Teaches `ARM::appendArchExtFeatures` to account dependencies when processing target features: i.e. when you say `-march=armv8.1-m.main+mve.fp+nofp` it means `mve.fp` should get discarded too. (Split from D63936 <https://reviews.llvm.org/D63936>)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D64048

Files:
  clang/test/Preprocessor/arm-target-features.c
  llvm/lib/Support/ARMTargetParser.cpp


Index: llvm/lib/Support/ARMTargetParser.cpp
===================================================================
--- llvm/lib/Support/ARMTargetParser.cpp
+++ llvm/lib/Support/ARMTargetParser.cpp
@@ -508,16 +508,30 @@
   return ARM::FK_INVALID;
 }
 
+static unsigned getAEKID(StringRef ArchExtName) {
+  for (const auto AE : ARM::ARCHExtNames)
+    if (AE.getName() == ArchExtName)
+      return AE.ID;
+  return ARM::AEK_INVALID;
+}
+
 bool ARM::appendArchExtFeatures(
   StringRef CPU, ARM::ArchKind AK, StringRef ArchExt,
   std::vector<StringRef> &Features) {
-  StringRef StandardFeature = getArchExtFeature(ArchExt);
-  if (!StandardFeature.empty()) {
-    Features.push_back(StandardFeature);
-    return true;
-  }
 
+  size_t StartingNumFeatures = Features.size();
   const bool Negated = stripNegationPrefix(ArchExt);
+  unsigned ID = getAEKID(ArchExt);
+
+  if (ID == AEK_INVALID)
+    return false;
+
+  for (const auto AE : ARCHExtNames) {
+    if (Negated && (AE.ID & ID) == ID && AE.NegFeature)
+      Features.push_back(AE.NegFeature);
+    else if (AE.ID == ID && AE.Feature)
+      Features.push_back(AE.Feature);
+  }
 
   if (CPU == "")
     CPU = "generic";
@@ -537,7 +551,7 @@
     }
     return ARM::getFPUFeatures(FPUKind, Features);
   }
-  return false;
+  return StartingNumFeatures != Features.size();
 }
 
 StringRef ARM::getHWDivName(unsigned HWDivKind) {
Index: clang/test/Preprocessor/arm-target-features.c
===================================================================
--- clang/test/Preprocessor/arm-target-features.c
+++ clang/test/Preprocessor/arm-target-features.c
@@ -769,6 +769,14 @@
 // CHECK-V81M-MVE-FP: #define __ARM_FEATURE_SIMD32 1
 // CHECK-V81M-MVE-FP: #define __ARM_FPV5__ 1
 
+// nofp discards mve.fp
+// RUN: %clang -target arm-arm-none-eabi -march=armv8.1-m.main+mve.fp+nofp -x c -E -dM %s -o - | FileCheck -match-full-lines --check-prefix=CHECK-V81M-MVEFP-NOFP %s
+// CHECK-V81M-MVEFP-NOFP-NOT: #define __ARM_FEATURE_MVE
+
+// nomve discards mve.fp
+// RUN: %clang -target arm-arm-none-eabi -march=armv8.1-m.main+mve.fp+nomve -x c -E -dM %s -o - | FileCheck -match-full-lines --check-prefix=CHECK-V81M-MVEFP-NOMVE %s
+// CHECK-V81M-MVEFP-NOMVE-NOT: #define __ARM_FEATURE_MVE
+
 // RUN: %clang -target armv8.1a-none-none-eabi -x c -E -dM %s -o - | FileCheck -match-full-lines --check-prefix=CHECK-V81A %s
 // CHECK-V81A: #define __ARM_ARCH 8
 // CHECK-V81A: #define __ARM_ARCH_8_1A__ 1


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