[Hexagon] Start using regmasks on calls

Reapply r295371 with a fix for the Windows bot failures.

llvm-svn: 295504

1 files changed, 15 insertions, 11 deletions

diff --git a/llvm/lib/Target/Hexagon/HexagonCopyToCombine.cpp b/llvm/lib/Target/Hexagon/HexagonCopyToCombine.cpp
index 36080997ec6..5f375f8dc74 100644
--- a/llvm/lib/Target/Hexagon/HexagonCopyToCombine.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonCopyToCombine.cpp
@@ -440,17 +440,21 @@ HexagonCopyToCombine::findPotentialNewifiableTFRs(MachineBasicBlock &BB) {
 
     // Put instructions that last defined integer or double registers into the
     // map.
-    for (unsigned I = 0, E = MI.getNumOperands(); I != E; ++I) {
-      MachineOperand &Op = MI.getOperand(I);
-      if (!Op.isReg() || !Op.isDef() || !Op.getReg())
-        continue;
-      unsigned Reg = Op.getReg();
-      if (Hexagon::DoubleRegsRegClass.contains(Reg)) {
-        for (MCSubRegIterator SubRegs(Reg, TRI); SubRegs.isValid(); ++SubRegs) {
-          LastDef[*SubRegs] = &MI;
-        }
-      } else if (Hexagon::IntRegsRegClass.contains(Reg))
-        LastDef[Reg] = &MI;
+    for (MachineOperand &Op : MI.operands()) {
+      if (Op.isReg()) {
+        if (!Op.isDef() || !Op.getReg())
+          continue;
+        unsigned Reg = Op.getReg();
+        if (Hexagon::DoubleRegsRegClass.contains(Reg)) {
+          for (MCSubRegIterator SubRegs(Reg, TRI); SubRegs.isValid(); ++SubRegs)
+            LastDef[*SubRegs] = &MI;
+        } else if (Hexagon::IntRegsRegClass.contains(Reg))
+          LastDef[Reg] = &MI;
+      } else if (Op.isRegMask()) {
+        for (unsigned Reg : Hexagon::IntRegsRegClass)
+          if (Op.clobbersPhysReg(Reg))
+            LastDef[Reg] = &MI;
+      }
     }
   }
 }