[AMDGPU] Prevent VGPR copies from moving across the EXEC mask definitions
Differential Revision: https://reviews.llvm.org/D63731
Reviewers: qcolombet, rampitec
llvm-svn: 369532
diff --git a/llvm/lib/CodeGen/PeepholeOptimizer.cpp b/llvm/lib/CodeGen/PeepholeOptimizer.cpp
index 6818195..02591a8 100644
--- a/llvm/lib/CodeGen/PeepholeOptimizer.cpp
+++ b/llvm/lib/CodeGen/PeepholeOptimizer.cpp
@@ -1808,7 +1808,11 @@
assert(Def->isCopy() && "Invalid definition");
// Copy instruction are supposed to be: Def = Src.
// If someone breaks this assumption, bad things will happen everywhere.
- assert(Def->getNumOperands() == 2 && "Invalid number of operands");
+ // There may be implicit uses preventing the copy to be moved across
+ // some target specific register definitions
+ assert(Def->getNumOperands() - Def->getNumImplicitOperands() == 2 &&
+ "Invalid number of operands");
+ assert(!Def->hasImplicitDef() && "Only implicit uses are allowed");
if (Def->getOperand(DefIdx).getSubReg() != DefSubReg)
// If we look for a different subreg, it means we want a subreg of src.