[VE] Correct stack alignment

Summary:
Change stack alignment from 64 bits to 128 bits to follow ABI correctly.
And add a regression test for datalayout.

Reviewers: simoll, k-ishizaka

Reviewed By: simoll

Subscribers: hiraditya, cfe-commits, llvm-commits

Tags: #llvm, #ve, #clang

Differential Revision: https://reviews.llvm.org/D83173

clang/lib/Basic/Targets/VE.h

@@ -45,7 +45,7 @@ public:
     WCharType = UnsignedInt;
     WIntType = UnsignedInt;
     UseZeroLengthBitfieldAlignment = true;
-    resetDataLayout("e-m:e-i64:64-n32:64-S64");
+    resetDataLayout("e-m:e-i64:64-n32:64-S128");
   }
 
   void getTargetDefines(const LangOptions &Opts,

clang/test/CodeGen/target-data.c

@@ -250,3 +250,7 @@
 // RUN: %clang_cc1 -triple bpfeb -o - -emit-llvm %s | \
 // RUN: FileCheck %s -check-prefix=BPFEB
 // BPFEB: target datalayout = "E-m:e-p:64:64-i64:64-i128:128-n32:64-S128"
+
+// RUN: %clang_cc1 -triple ve -o - -emit-llvm %s | \
+// RUN: FileCheck %s -check-prefix=VE
+// VE: target datalayout = "e-m:e-i64:64-n32:64-S128"

llvm/lib/Target/VE/VETargetMachine.cpp

@@ -41,8 +41,8 @@ static std::string computeDataLayout(const Triple &T) {
   // VE supports 32 bit and 64 bits integer on registers
   Ret += "-n32:64";
 
-  // Stack alignment is 64 bits
-  Ret += "-S64";
+  // Stack alignment is 128 bits
+  Ret += "-S128";
 
   return Ret;
 }