Index: lib/Target/AMDGPU/SIInstructions.td
===================================================================
--- lib/Target/AMDGPU/SIInstructions.td
+++ lib/Target/AMDGPU/SIInstructions.td
@@ -1582,7 +1582,8 @@
 
 } // End isCommutable = 1
 
-let isConvergent = 1 in {
+// These are special and do not read the exec mask.
+let isConvergent = 1, Uses = []<Register> in {
 
 defm V_READLANE_B32 : VOP2SI_3VI_m <
   vop3 <0x001, 0x289>,