[llvm] r274790 - [AArch64] Change the preferred alignment for char and short to word alignment.

[Chad Rosier via llvm-commits]

Author: mcrosier
Date: Thu Jul  7 15:02:18 2016
New Revision: 274790

URL: http://llvm.org/viewvc/llvm-project?rev=274790&view=rev
Log:
[AArch64] Change the preferred alignment for char and short to word alignment.

The commit reinstates r273279, which was informally approved.

Original Review: http://reviews.llvm.org/D21414

This reverts commit ca632c91aaa7cafc50942f890c49f727a046ace1.

Added:
    llvm/trunk/test/CodeGen/AArch64/preferred-alignment.ll
Modified:
    llvm/trunk/lib/Target/AArch64/AArch64TargetMachine.cpp

Modified: llvm/trunk/lib/Target/AArch64/AArch64TargetMachine.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64TargetMachine.cpp?rev=274790&r1=274789&r2=274790&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64TargetMachine.cpp (original)
+++ llvm/trunk/lib/Target/AArch64/AArch64TargetMachine.cpp Thu Jul  7 15:02:18 2016
@@ -133,8 +133,8 @@ static std::string computeDataLayout(con
   if (TT.isOSBinFormatMachO())
     return "e-m:o-i64:64-i128:128-n32:64-S128";
   if (LittleEndian)
-    return "e-m:e-i64:64-i128:128-n32:64-S128";
-  return "E-m:e-i64:64-i128:128-n32:64-S128";
+    return "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128";
+  return "E-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128";
 }
 
 // Helper function to set up the defaults for reciprocals.

Added: llvm/trunk/test/CodeGen/AArch64/preferred-alignment.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AArch64/preferred-alignment.ll?rev=274790&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/AArch64/preferred-alignment.ll (added)
+++ llvm/trunk/test/CodeGen/AArch64/preferred-alignment.ll Thu Jul  7 15:02:18 2016
@@ -0,0 +1,28 @@
+; RUN: llc -mtriple=aarch64 -O0 < %s | FileCheck %s
+
+; Function Attrs: nounwind
+define i32 @foo() #0 {
+entry:
+  %c = alloca i8, align 1
+; CHECK:	add	x0, sp, #12
+  %s = alloca i16, align 2
+; CHECK-NEXT:	add	x1, sp, #8
+  %i = alloca i32, align 4
+; CHECK-NEXT:	add	x2, sp, #4
+  %call = call i32 @bar(i8* %c, i16* %s, i32* %i)
+  %0 = load i8, i8* %c, align 1
+  %conv = zext i8 %0 to i32
+  %add = add nsw i32 %call, %conv
+  %1 = load i16, i16* %s, align 2
+  %conv1 = sext i16 %1 to i32
+  %add2 = add nsw i32 %add, %conv1
+  %2 = load i32, i32* %i, align 4
+  %add3 = add nsw i32 %add2, %2
+  ret i32 %add3
+}
+
+declare i32 @bar(i8*, i16*, i32*) #1
+
+attributes #0 = { nounwind "no-frame-pointer-elim"="false" }
+attributes #1 = { "no-frame-pointer-elim"="false" }
+