[AMDGPU][MC][GFX9][disassembler] Corrected decoding of op_sel_hi for v_mad_mix*

See bug 35148: https://bugs.llvm.org//show_bug.cgi?id=35148

Reviewers: tamazov, SamWot, arsenm

Differential Revision: https://reviews.llvm.org/D39492

llvm-svn: 318526

1 files changed, 6 insertions, 3 deletions

diff --git a/llvm/lib/Target/AMDGPU/InstPrinter/AMDGPUInstPrinter.cpp b/llvm/lib/Target/AMDGPU/InstPrinter/AMDGPUInstPrinter.cpp
index cd79fbe5751..537769bf27e 100644
--- a/llvm/lib/Target/AMDGPU/InstPrinter/AMDGPUInstPrinter.cpp
+++ b/llvm/lib/Target/AMDGPU/InstPrinter/AMDGPUInstPrinter.cpp
@@ -806,8 +806,8 @@ void AMDGPUInstPrinter::printExpTgt(const MCInst *MI, unsigned OpNo,
 }
 
 static bool allOpsDefaultValue(const int* Ops, int NumOps, int Mod,
-                               bool HasDstSel) {
-  int DefaultValue = (Mod == SISrcMods::OP_SEL_1);
+                               bool IsPacked, bool HasDstSel) {
+  int DefaultValue = IsPacked && (Mod == SISrcMods::OP_SEL_1);
 
   for (int I = 0; I < NumOps; ++I) {
     if (!!(Ops[I] & Mod) != DefaultValue)
@@ -843,7 +843,10 @@ void AMDGPUInstPrinter::printPackedModifier(const MCInst *MI,
     Mod == SISrcMods::OP_SEL_0 &&
     MII.get(MI->getOpcode()).TSFlags & SIInstrFlags::VOP3_OPSEL;
 
-  if (allOpsDefaultValue(Ops, NumOps, Mod, HasDstSel))
+  const bool IsPacked =
+    MII.get(MI->getOpcode()).TSFlags & SIInstrFlags::IsPacked;
+
+  if (allOpsDefaultValue(Ops, NumOps, Mod, IsPacked, HasDstSel))
     return;
 
   O << Name;