From: Tom Stellard <thomas.stellard@amd.com>
Date: Wed, 25 Jul 2012 12:46:35 +0000 (-0400)
Subject: radeon/llvm: Assert if we try to copy SCC reg
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d4bdd09d4714ae51b9f5675f7f5c678d431061e8;p=mesa.git

radeon/llvm: Assert if we try to copy SCC reg
---

diff --git a/src/gallium/drivers/radeon/SIInstrInfo.cpp b/src/gallium/drivers/radeon/SIInstrInfo.cpp
index 4438d67f877..26f45fce417 100644
--- a/src/gallium/drivers/radeon/SIInstrInfo.cpp
+++ b/src/gallium/drivers/radeon/SIInstrInfo.cpp
@@ -38,6 +38,12 @@ SIInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
                            unsigned DestReg, unsigned SrcReg,
                            bool KillSrc) const
 {
+
+  // If we are trying to copy to or from SCC, there is a bug somewhere else in
+  // the backend.  While it may be theoretically possible to do this, it should
+  // never be necessary.
+  assert(DestReg != AMDGPU::SCC && SrcReg != AMDGPU::SCC);
+
   BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DestReg)
    .addReg(SrcReg, getKillRegState(KillSrc));
 }