[PATCH] D22198: AMDGPU: Do not clobber SCC in SIWholeQuadMode

[Matt Arsenault via llvm-commits]

arsenm added inline comments.

================
Comment at: lib/Target/AMDGPU/SIWholeQuadMode.cpp:531-535
@@ +530,7 @@
+              SaveReg)
+          .addImm(1)
+          .addImm(0);
+  MachineInstr *Restore =
+      BuildMI(MBB, Before, DebugLoc(), TII->get(AMDGPU::S_CMP_GT_U32))
+          .addReg(SaveReg)
+          .addImm(0);
----------------
arsenm wrote:
> I think this should use -1 instead of 1, and use compare != 0 to be more canonical
Maybe you should just emit COPY and move this expansion to copyPhysReg for scc


https://reviews.llvm.org/D22198