[PATCH] D117193: [PowerPC] Emit gnu_attribute according to float-abi metadata

[Qiu Chaofan via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGad0345aed1e7: [PowerPC] Emit gnu_attribute according to float-abi metadata (authored by qiucf).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D117193/new/

https://reviews.llvm.org/D117193

Files:
  llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
  llvm/test/CodeGen/PowerPC/gnu-attribute.ll


Index: llvm/test/CodeGen/PowerPC/gnu-attribute.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/PowerPC/gnu-attribute.ll
@@ -0,0 +1,15 @@
+; RUN: sed -e 's/FLTABI/ieeequad/' %s | llc -mtriple=powerpc64le | FileCheck %s --check-prefix=IEEE
+; RUN: sed -e 's/FLTABI/doubledouble/' %s | llc -mtriple=powerpc64le | FileCheck %s --check-prefix=IBM
+; RUN: sed -e 's/FLTABI/ieeedouble/' %s | llc -mtriple=powerpc64le | FileCheck %s --check-prefix=DBL
+; RUN: sed -e 's/FLTABI//' %s | llc -mtriple=powerpc64le | FileCheck %s --check-prefix=NONE
+
+; IEEE: .gnu_attribute 4, 13
+; IBM: .gnu_attribute 4, 5
+; DBL: .gnu_attribute 4, 9
+; NONE-NOT: .gnu_attribute 4,
+
+!llvm.module.flags = !{!0, !1, !2}
+
+!0 = !{i32 1, !"wchar_size", i32 4}
+!1 = !{i32 7, !"uwtable", i32 1}
+!2 = !{i32 1, !"float-abi", !"FLTABI"}
Index: llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
===================================================================
--- llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -109,6 +109,23 @@
 
 namespace {
 
+enum {
+  // GNU attribute tags for PowerPC ABI
+  Tag_GNU_Power_ABI_FP = 4,
+  Tag_GNU_Power_ABI_Vector = 8,
+  Tag_GNU_Power_ABI_Struct_Return = 12,
+
+  // GNU attribute values for PowerPC float ABI, as combination of two parts
+  Val_GNU_Power_ABI_NoFloat = 0b00,
+  Val_GNU_Power_ABI_HardFloat_DP = 0b01,
+  Val_GNU_Power_ABI_SoftFloat_DP = 0b10,
+  Val_GNU_Power_ABI_HardFloat_SP = 0b11,
+
+  Val_GNU_Power_ABI_LDBL_IBM128 = 0b0100,
+  Val_GNU_Power_ABI_LDBL_64 = 0b1000,
+  Val_GNU_Power_ABI_LDBL_IEEE128 = 0b1100,
+};
+
 class PPCAsmPrinter : public AsmPrinter {
 protected:
   // For TLS on AIX, we need to be able to identify TOC entries of specific
@@ -178,6 +195,8 @@
     return "Linux PPC Assembly Printer";
   }
 
+  void emitGNUAttributes(Module &M);
+
   void emitStartOfAsmFile(Module &M) override;
   void emitEndOfAsmFile(Module &) override;
 
@@ -1388,6 +1407,28 @@
   EmitToStreamer(*OutStreamer, TmpInst);
 }
 
+void PPCLinuxAsmPrinter::emitGNUAttributes(Module &M) {
+  // Emit float ABI into GNU attribute
+  Metadata *MD = M.getModuleFlag("float-abi");
+  MDString *FloatABI = dyn_cast_or_null<MDString>(MD);
+  if (!FloatABI)
+    return;
+  StringRef flt = FloatABI->getString();
+  // TODO: Support emitting soft-fp and hard double/single attributes.
+  if (flt == "doubledouble")
+    OutStreamer->emitGNUAttribute(Tag_GNU_Power_ABI_FP,
+                                  Val_GNU_Power_ABI_HardFloat_DP |
+                                      Val_GNU_Power_ABI_LDBL_IBM128);
+  else if (flt == "ieeequad")
+    OutStreamer->emitGNUAttribute(Tag_GNU_Power_ABI_FP,
+                                  Val_GNU_Power_ABI_HardFloat_DP |
+                                      Val_GNU_Power_ABI_LDBL_IEEE128);
+  else if (flt == "ieeedouble")
+    OutStreamer->emitGNUAttribute(Tag_GNU_Power_ABI_FP,
+                                  Val_GNU_Power_ABI_HardFloat_DP |
+                                      Val_GNU_Power_ABI_LDBL_64);
+}
+
 void PPCLinuxAsmPrinter::emitInstruction(const MachineInstr *MI) {
   if (!Subtarget->isPPC64())
     return PPCAsmPrinter::emitInstruction(MI);
@@ -1642,6 +1683,8 @@
   PPCTargetStreamer *TS =
       static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
 
+  emitGNUAttributes(M);
+
   if (!TOC.empty()) {
     const char *Name = isPPC64 ? ".toc" : ".got2";
     MCSectionELF *Section = OutContext.getELFSection(


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