[AIX] Use .space instead of .zero in assembly

Summary:
The AIX system assembler does not understand .zero, so we should prefer
emitting .space.

Subscribers: nemanjai, hiraditya, kbarton, MaskRay, jsji, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68815

llvm-svn: 374564

2 files changed, 18 insertions, 0 deletions

diff --git a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCAsmInfo.cpp b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCAsmInfo.cpp
index 5f0005ea1d7..1216cd72728 100644
--- a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCAsmInfo.cpp
+++ b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCAsmInfo.cpp
@@ -86,4 +86,5 @@ void PPCXCOFFMCAsmInfo::anchor() {}
 PPCXCOFFMCAsmInfo::PPCXCOFFMCAsmInfo(bool Is64Bit, const Triple &T) {
   assert(!IsLittleEndian && "Little-endian XCOFF not supported.");
   CodePointerSize = CalleeSaveStackSlotSize = Is64Bit ? 8 : 4;
+  ZeroDirective = "\t.space\t";
 }
diff --git a/llvm/test/CodeGen/PowerPC/aix-space.ll b/llvm/test/CodeGen/PowerPC/aix-space.ll
new file mode 100644
index 00000000000..d681d636e66
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/aix-space.ll
@@ -0,0 +1,17 @@
+; RUN: llc -verify-machineinstrs -O0 -mcpu=pwr7 -mtriple powerpc-ibm-aix-xcoff < %s | FileCheck %s
+
+@a = common global double 0.000000e+00, align 8
+
+; Get some constants into the constant pool that need spacing for alignment
+define void @e() {
+entry:
+  %0 = load double, double* @a, align 8
+  %mul = fmul double 1.500000e+00, %0
+  store double %mul, double* @a, align 8
+  %mul1 = fmul double 0x3F9C71C71C71C71C, %0
+  store double %mul1, double* @a, align 8
+  ret void
+}
+
+; CHECK:      .space 4
+; CHECK-NOT:  .zero