[AIX] Add mabi=vec-extabi options to enable the AIX extended and default vector ABIs.

Added support for the options mabi=vec-extabi and mabi=vec-default which are analogous to qvecnvol and qnovecnvol when using XL on AIX.
The extended Altivec ABI on AIX is enabled using mabi=vec-extabi in clang and vec-extabi in llc.

Reviewed By: Xiangling_L, DiggerLin

Differential Revision: https://reviews.llvm.org/D89684

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/CommandFlags.cpp b/llvm/lib/CodeGen/CommandFlags.cpp
index bb15ff2..080592b 100644
--- a/llvm/lib/CodeGen/CommandFlags.cpp
+++ b/llvm/lib/CodeGen/CommandFlags.cpp
@@ -58,6 +58,7 @@ CGOPT(bool, EnableNoInfsFPMath)
 CGOPT(bool, EnableNoNaNsFPMath)
 CGOPT(bool, EnableNoSignedZerosFPMath)
 CGOPT(bool, EnableNoTrappingFPMath)
+CGOPT(bool, EnableAIXExtendedAltivecABI)
 CGOPT(DenormalMode::DenormalModeKind, DenormalFPMath)
 CGOPT(DenormalMode::DenormalModeKind, DenormalFP32Math)
 CGOPT(bool, EnableHonorSignDependentRoundingFPMath)
@@ -282,6 +283,11 @@ codegen::RegisterCodeGenFlags::RegisterCodeGenFlags() {
       cl::init(false));
   CGBINDOPT(DontPlaceZerosInBSS);
 
+  static cl::opt<bool> EnableAIXExtendedAltivecABI(
+      "vec-extabi", cl::desc("Enable the AIX Extended Altivec ABI."),
+      cl::init(false));
+  CGBINDOPT(EnableAIXExtendedAltivecABI);
+
   static cl::opt<bool> EnableGuaranteedTailCallOpt(
       "tailcallopt",
       cl::desc(
@@ -516,6 +522,7 @@ codegen::InitTargetOptionsFromCodeGenFlags(const Triple &TheTriple) {
       getEnableHonorSignDependentRoundingFPMath();
   if (getFloatABIForCalls() != FloatABI::Default)
     Options.FloatABIType = getFloatABIForCalls();
+  Options.EnableAIXExtendedAltivecABI = getEnableAIXExtendedAltivecABI();
   Options.NoZerosInBSS = getDontPlaceZerosInBSS();
   Options.GuaranteedTailCallOpt = getEnableGuaranteedTailCallOpt();
   Options.StackAlignmentOverride = getOverrideStackAlignment();