[llvm] r202572 - [Sparc] Implement writeNopData. Emit actual NOP instruction instead of just filling with zeroes.

[Venkatraman Govindaraju]

Author: venkatra
Date: Fri Feb 28 23:45:09 2014
New Revision: 202572

URL: http://llvm.org/viewvc/llvm-project?rev=202572&view=rev
Log:
[Sparc] Implement writeNopData. Emit actual NOP instruction instead of just filling with zeroes.

Added:
    llvm/trunk/test/MC/Sparc/sparc-nop-data.s
Modified:
    llvm/trunk/lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp

Modified: llvm/trunk/lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp?rev=202572&r1=202571&r2=202572&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp (original)
+++ llvm/trunk/lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp Fri Feb 28 23:45:09 2014
@@ -200,9 +200,14 @@ namespace {
     }
 
     bool writeNopData(uint64_t Count, MCObjectWriter *OW) const {
-      // FIXME: Zero fill for now.
-      for (uint64_t i = 0; i != Count; ++i)
-        OW->Write8(0);
+      // Cannot emit NOP with size not multiple of 32 bits.
+      if (Count % 4 != 0)
+        return false;
+
+      uint64_t NumNops = Count / 4;
+      for (uint64_t i = 0; i != NumNops; ++i)
+        OW->Write32(0x01000000);
+
       return true;
     }
 

Added: llvm/trunk/test/MC/Sparc/sparc-nop-data.s
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/Sparc/sparc-nop-data.s?rev=202572&view=auto
==============================================================================
--- llvm/trunk/test/MC/Sparc/sparc-nop-data.s (added)
+++ llvm/trunk/test/MC/Sparc/sparc-nop-data.s Fri Feb 28 23:45:09 2014
@@ -0,0 +1,11 @@
+! RUN: llvm-mc %s -arch=sparc  -filetype=obj | llvm-readobj -s -sd | FileCheck %s
+! RUN: llvm-mc %s -arch=sparcv9  -filetype=obj | llvm-readobj -s -sd | FileCheck %s
+
+! CHECK: 0000: BA1F401D 01000000 01000000 01000000
+! CHECK: 0010: BA1F401D
+
+foo:
+        xor %i5, %i5, %i5
+        .align 16
+        xor %i5, %i5, %i5
+